diff --git a/cmake/define.inc b/cmake/define.inc
index d6a3f2b915..468489c1cc 100755
--- a/cmake/define.inc
+++ b/cmake/define.inc
@@ -147,7 +147,11 @@ IF (TD_DARWIN_64)
   ADD_DEFINITIONS(-D_REENTRANT -D__USE_POSIX -D_LIBC_REENTRANT)
   ADD_DEFINITIONS(-DUSE_LIBICONV)
   MESSAGE(STATUS "darwin64 is defined")
-  SET(COMMON_FLAGS "-Wall -Werror -Wno-missing-braces -fPIC -msse4.2 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILE")
+  IF ("${CPUTYPE}" STREQUAL "apple_m1")
+    SET(COMMON_FLAGS "-Wall -Werror -Wno-missing-braces -fPIC -D_FILE_OFFSET_BITS=64 -D_LARGE_FILE")
+  ELSE ()
+    SET(COMMON_FLAGS "-Wall -Werror -Wno-missing-braces -fPIC -msse4.2 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILE")
+  ENDIF ()
   IF (TD_MEMORY_SANITIZER)
     SET(DEBUG_FLAGS "-fsanitize=address -fsanitize=undefined -fno-sanitize-recover=all -fsanitize=float-divide-by-zero -fsanitize=float-cast-overflow -fno-sanitize=null -fno-sanitize=alignment -O0 -g3 -DDEBUG")
   ELSE ()
diff --git a/cmake/install.inc b/cmake/install.inc
index b37cf751fb..30aa801122 100755
--- a/cmake/install.inc
+++ b/cmake/install.inc
@@ -32,7 +32,7 @@ ELSEIF (TD_WINDOWS)
   #INSTALL(TARGETS taos RUNTIME DESTINATION driver)
   #INSTALL(TARGETS shell RUNTIME DESTINATION .)
   IF (TD_MVN_INSTALLED)
-    INSTALL(FILES ${LIBRARY_OUTPUT_PATH}/taos-jdbcdriver-2.0.31.jar DESTINATION connector/jdbc)
+    INSTALL(FILES ${LIBRARY_OUTPUT_PATH}/taos-jdbcdriver-2.0.32-dist.jar DESTINATION connector/jdbc)
   ENDIF ()
 ELSEIF (TD_DARWIN)
   SET(TD_MAKE_INSTALL_SH "${TD_COMMUNITY_DIR}/packaging/tools/make_install.sh")
diff --git a/cmake/platform.inc b/cmake/platform.inc
index 5f7391c996..236732e452 100755
--- a/cmake/platform.inc
+++ b/cmake/platform.inc
@@ -108,6 +108,10 @@ IF ("${CPUTYPE}" STREQUAL "")
     SET(TD_LINUX TRUE)
     SET(TD_LINUX_64 FALSE)
     SET(TD_MIPS_64 TRUE)
+  ELSEIF (CMAKE_SYSTEM_PROCESSOR MATCHES "arm64")
+    SET(CPUTYPE "apple_m1")
+    MESSAGE(STATUS "Set CPUTYPE to apple silicon m1")
+    SET(TD_ARM_64 TRUE)
   ENDIF ()
 
 ELSE ()
diff --git a/documentation20/cn/00.index/docs.md b/documentation20/cn/00.index/docs.md
index c900cd373d..18bdc15d30 100644
--- a/documentation20/cn/00.index/docs.md
+++ b/documentation20/cn/00.index/docs.md
@@ -63,7 +63,7 @@ TDengine是一个高效的存储、查询、分析时序大数据的平台，专
 ## [高级功能](/advanced-features)
 
 * [连续查询(Continuous Query)](/advanced-features#continuous-query)：基于滑动窗口，定时自动的对数据流进行查询计算
-* [数据订阅(Publisher/Subscriber)](/advanced-features#subscribe)：象典型的消息队列，应用可订阅接收到的最新数据
+* [数据订阅(Publisher/Subscriber)](/advanced-features#subscribe)：类似典型的消息队列，应用可订阅接收到的最新数据
 * [缓存(Cache)](/advanced-features#cache)：每个设备最新的数据都会缓存在内存中，可快速获取
 * [报警监测](/advanced-features#alert)：根据配置规则，自动监测超限行为数据，并主动推送
 
@@ -106,6 +106,7 @@ TDengine是一个高效的存储、查询、分析时序大数据的平台，专
 * [数据导入](/administrator#import)：可按脚本文件导入，也可按数据文件导入
 * [数据导出](/administrator#export)：从shell按表导出，也可用taosdump工具做各种导出
 * [系统监控](/administrator#status)：检查系统现有的连接、查询、流式计算，日志和事件等
+* [性能优化](/administrator#optimize)：对长期运行的系统进行维护优化，保障性能表现
 * [文件目录结构](/administrator#directories)：TDengine数据文件、配置文件等所在目录
 * [参数限制与保留关键字](/administrator#keywords)：TDengine的参数限制与保留关键字列表
 
diff --git a/documentation20/cn/08.connector/01.java/docs.md b/documentation20/cn/08.connector/01.java/docs.md
index fb47d79268..511bab8a60 100644
--- a/documentation20/cn/08.connector/01.java/docs.md
+++ b/documentation20/cn/08.connector/01.java/docs.md
@@ -532,8 +532,9 @@ Query OK, 1 row(s) in set (0.000141s)
 
 | taos-jdbcdriver 版本 | TDengine 版本     | JDK 版本 |
 | -------------------- | ----------------- | -------- |
-| 2.0.22              | 2.0.18.0 及以上     | 1.8.x    |
-| 2.0.12 - 2.0.21     | 2.0.8.0 - 2.0.17.0 | 1.8.x    |
+| 2.0.31              | 2.1.3.0 及以上      | 1.8.x    |
+| 2.0.22 - 2.0.30    | 2.0.18.0 - 2.1.2.x | 1.8.x    |
+| 2.0.12 - 2.0.21     | 2.0.8.0 - 2.0.17.x | 1.8.x    |
 | 2.0.4 - 2.0.11       | 2.0.0.0 - 2.0.7.x | 1.8.x    |
 | 1.0.3                | 1.6.1.x 及以上    | 1.8.x    |
 | 1.0.2                | 1.6.1.x 及以上    | 1.8.x    |
diff --git a/documentation20/cn/08.connector/docs.md b/documentation20/cn/08.connector/docs.md
index 2d76c866d1..3a6e884f56 100644
--- a/documentation20/cn/08.connector/docs.md
+++ b/documentation20/cn/08.connector/docs.md
@@ -259,7 +259,7 @@ typedef struct taosField {
 
   获取最近一次API调用失败的原因,返回值为字符串。
 
-- `char *taos_errno(TAOS_RES *res)`
+- `int taos_errno(TAOS_RES *res)`
 
   获取最近一次API调用失败的原因，返回值为错误代码。
 
@@ -427,12 +427,15 @@ TDengine提供时间驱动的实时流式计算API。可以每隔一指定的时
     * res：查询结果集，注意结果集中可能没有记录
     * param：调用 `taos_subscribe`时客户程序提供的附加参数
     * code：错误码
+  
   **注意**：在这个回调函数里不可以做耗时过长的处理，尤其是对于返回的结果集中数据较多的情况，否则有可能导致客户端阻塞等异常状态。如果必须进行复杂计算，则建议在另外的线程中进行处理。
 
 * `TAOS_RES *taos_consume(TAOS_SUB *tsub)`
 
   同步模式下，该函数用来获取订阅的结果。 用户应用程序将其置于一个循环之中。 如两次调用`taos_consume`的间隔小于订阅的轮询周期，API将会阻塞，直到时间间隔超过此周期。 如果数据库有新记录到达，该API将返回该最新的记录，否则返回一个没有记录的空结果集。 如果返回值为 `NULL`，说明系统出错。 异步模式下，用户程序不应调用此API。
 
+  **注意**：在调用 `taos_consume()` 之后，用户应用应确保尽快调用 `taos_fetch_row()` 或 `taos_fetch_block()` 来处理订阅结果，否则服务端会持续缓存查询结果数据等待客户端读取，极端情况下会导致服务端内存消耗殆尽，影响服务稳定性。
+
 * `void taos_unsubscribe(TAOS_SUB *tsub, int keepProgress)`
 
   取消订阅。 如参数 `keepProgress` 不为0，API会保留订阅的进度信息，后续调用 `taos_subscribe` 时可以基于此进度继续；否则将删除进度信息，后续只能重新开始读取数据。
@@ -554,6 +557,13 @@ c1.close()
 conn.close()
 ```
 
+#### 关于纳秒 (nanosecond) 在 Python 连接器中的说明
+
+由于目前 Python 对 nanosecond 支持的不完善(参见链接 1. 2. )，目前的实现方式是在 nanosecond 精度时返回整数，而不是 ms 和 us 返回的 datetime 类型，应用开发者需要自行处理，建议使用 pandas 的 to_datetime()。未来如果 Python 正式完整支持了纳秒，涛思数据可能会修改相关接口。
+
+1. https://stackoverflow.com/questions/10611328/parsing-datetime-strings-containing-nanoseconds
+2. https://www.python.org/dev/peps/pep-0564/
+
 #### 帮助信息
 
 用户可通过python的帮助信息直接查看模块的使用信息，或者参考tests/examples/python中的示例程序。以下为部分常用类和方法：
@@ -897,6 +907,10 @@ go env -w GOPROXY=https://goproxy.io,direct
 
   sql.Open内置的方法，Close closes the statement.	
 
+### 其他代码示例
+
+[Consume Messages from Kafka](https://github.com/taosdata/go-demo-kafka) 是一个通过 Go 语言实现消费 Kafka 队列写入 TDengine 的示例程序，也可以作为通过 Go 连接 TDengine 的写法参考。
+
 ## <a class="anchor" id="nodejs"></a>Node.js Connector
 
 Node.js连接器支持的系统有：
diff --git a/documentation20/cn/11.administrator/docs.md b/documentation20/cn/11.administrator/docs.md
index 10951ed1fb..753f91f589 100644
--- a/documentation20/cn/11.administrator/docs.md
+++ b/documentation20/cn/11.administrator/docs.md
@@ -418,6 +418,19 @@ TDengine启动后，会自动创建一个监测数据库log，并自动将服务
 
 这些监测信息的采集缺省是打开的，但可以修改配置文件里的选项enableMonitor将其关闭或打开。
 
+<a class="anchor" id="optimize"></a>
+## 性能优化
+
+因数据行 [update](https://www.taosdata.com/cn/documentation/faq#update)、表删除、数据过期等原因，TDengine 的磁盘存储文件有可能出现数据碎片，影响查询操作的性能表现。从 2.1.3.0 版本开始，新增 SQL 指令 COMPACT 来启动碎片重整过程：
+
+```mysql
+COMPACT VNODES IN (vg_id1, vg_id2, ...)
+```
+
+COMPACT 命令对指定的一个或多个 VGroup 启动碎片重整，系统会通过任务队列尽快安排重整操作的具体执行。COMPACT 指令所需的 VGroup id，可以通过 `SHOW VGROUPS;` 指令的输出结果获取；而且在 `SHOW VGROUPS;` 中会有一个 compacting 列，值为 1 时表示对应的 VGroup 正在进行碎片重整，为 0 时则表示并没有处于重整状态。
+
+需要注意的是，碎片重整操作会大幅消耗磁盘 I/O。因此在重整进行期间，有可能会影响节点的写入和查询性能，甚至在极端情况下导致短时间的阻写。
+
 ## <a class="anchor" id="directories"></a>文件目录结构
 
 安装TDengine后，默认会在操作系统中生成下列目录或文件：
@@ -465,43 +478,44 @@ TDengine的所有可执行文件默认存放在 _/usr/local/taos/bin_ 目录下
 
 目前 TDengine 有将近 200 个内部保留关键字，这些关键字无论大小写均不可以用作库名、表名、STable 名、数据列名及标签列名等。这些关键字列表如下：
 
-| 关键字列表 |             |              |            |           |
-| ---------- | ----------- | ------------ | ---------- | --------- |
-| ABLOCKS    | CONNECTIONS | HAVING       | MODULES    | SMALLINT  |
-| ABORT      | COPY        | ID           | NCHAR      | SPREAD    |
-| ACCOUNT    | COUNT       | IF           | NE         | STABLE    |
-| ACCOUNTS   | CREATE      | IGNORE       | NONE       | STABLES   |
-| ADD        | CTIME       | IMMEDIATE    | NOT        | STAR      |
-| AFTER      | DATABASE    | IMPORT       | NOTNULL    | STATEMENT |
-| ALL        | DATABASES   | IN           | NOW        | STDDEV    |
-| ALTER      | DAYS        | INITIALLY    | OF         | STREAM    |
-| AND        | DEFERRED    | INSERT       | OFFSET     | STREAMS   |
-| AS         | DELIMITERS  | INSTEAD      | OR         | STRING    |
-| ASC        | DESC        | INTEGER      | ORDER      | SUM       |
-| ATTACH     | DESCRIBE    | INTERVAL     | PASS       | TABLE     |
-| AVG        | DETACH      | INTO         | PERCENTILE | TABLES    |
-| BEFORE     | DIFF        | IP           | PLUS       | TAG       |
-| BEGIN      | DISTINCT    | IS           | PRAGMA     | TAGS      |
-| BETWEEN    | DIVIDE      | ISNULL       | PREV       | TBLOCKS   |
-| BIGINT     | DNODE       | JOIN         | PRIVILEGE  | TBNAME    |
-| BINARY     | DNODES      | KEEP         | QUERIES    | TIMES     |
-| BITAND     | DOT         | KEY          | QUERY      | TIMESTAMP |
-| BITNOT     | DOUBLE      | KILL         | RAISE      | TINYINT   |
-| BITOR      | DROP        | LAST         | REM        | TOP       |
-| BOOL       | EACH        | LE           | REPLACE    | TOPIC     |
-| BOTTOM     | END         | LEASTSQUARES | REPLICA    | TRIGGER   |
-| BY         | EQ          | LIKE         | RESET      | UMINUS    |
-| CACHE      | EXISTS      | LIMIT        | RESTRICT   | UNION     |
-| CASCADE    | EXPLAIN     | LINEAR       | ROW        | UPLUS     |
-| CHANGE     | FAIL        | LOCAL        | ROWS       | USE       |
-| CLOG       | FILL        | LP           | RP         | USER      |
-| CLUSTER    | FIRST       | LSHIFT       | RSHIFT     | USERS     |
-| COLON      | FLOAT       | LT           | SCORES     | USING     |
-| COLUMN     | FOR         | MATCH        | SELECT     | VALUES    |
-| COMMA      | FROM        | MAX          | SEMI       | VARIABLE  |
-| COMP       | GE          | METRIC       | SET        | VGROUPS   |
-| CONCAT     | GLOB        | METRICS      | SHOW       | VIEW      |
-| CONFIGS    | GRANTS      | MIN          | SLASH      | WAVG      |
-| CONFLICT   | GROUP       | MINUS        | SLIDING    | WHERE     |
-| CONNECTION | GT          | MNODES       | SLIMIT     |           |
+|  关键字列表  |              |              |              |              |
+| ------------ | ------------ | ------------ | ------------ | ------------ |
+| ABORT        | CREATE       | IGNORE       | NULL         | STAR         |
+| ACCOUNT      | CTIME        | IMMEDIATE    | OF           | STATE        |
+| ACCOUNTS     | DATABASE     | IMPORT       | OFFSET       | STATEMENT    |
+| ADD          | DATABASES    | IN           | OR           | STATE_WINDOW |
+| AFTER        | DAYS         | INITIALLY    | ORDER        | STORAGE      |
+| ALL          | DBS          | INSERT       | PARTITIONS   | STREAM       |
+| ALTER        | DEFERRED     | INSTEAD      | PASS         | STREAMS      |
+| AND          | DELIMITERS   | INT          | PLUS         | STRING       |
+| AS           | DESC         | INTEGER      | PPS          | SYNCDB       |
+| ASC          | DESCRIBE     | INTERVAL     | PRECISION    | TABLE        |
+| ATTACH       | DETACH       | INTO         | PREV         | TABLES       |
+| BEFORE       | DISTINCT     | IS           | PRIVILEGE    | TAG          |
+| BEGIN        | DIVIDE       | ISNULL       | QTIME        | TAGS         |
+| BETWEEN      | DNODE        | JOIN         | QUERIES      | TBNAME       |
+| BIGINT       | DNODES       | KEEP         | QUERY        | TIMES        |
+| BINARY       | DOT          | KEY          | QUORUM       | TIMESTAMP    |
+| BITAND       | DOUBLE       | KILL         | RAISE        | TINYINT      |
+| BITNOT       | DROP         | LE           | REM          | TOPIC        |
+| BITOR        | EACH         | LIKE         | REPLACE      | TOPICS       |
+| BLOCKS       | END          | LIMIT        | REPLICA      | TRIGGER      |
+| BOOL         | EQ           | LINEAR       | RESET        | TSERIES      |
+| BY           | EXISTS       | LOCAL        | RESTRICT     | UMINUS       |
+| CACHE        | EXPLAIN      | LP           | ROW          | UNION        |
+| CACHELAST    | FAIL         | LSHIFT       | RP           | UNSIGNED     |
+| CASCADE      | FILE         | LT           | RSHIFT       | UPDATE       |
+| CHANGE       | FILL         | MATCH        | SCORES       | UPLUS        |
+| CLUSTER      | FLOAT        | MAXROWS      | SELECT       | USE          |
+| COLON        | FOR          | MINROWS      | SEMI         | USER         |
+| COLUMN       | FROM         | MINUS        | SESSION      | USERS        |
+| COMMA        | FSYNC        | MNODES       | SET          | USING        |
+| COMP         | GE           | MODIFY       | SHOW         | VALUES       |
+| COMPACT      | GLOB         | MODULES      | SLASH        | VARIABLE     |
+| CONCAT       | GRANTS       | NCHAR        | SLIDING      | VARIABLES    |
+| CONFLICT     | GROUP        | NE           | SLIMIT       | VGROUPS      |
+| CONNECTION   | GT           | NONE         | SMALLINT     | VIEW         |
+| CONNECTIONS  | HAVING       | NOT          | SOFFSET      | VNODES       |
+| CONNS        | ID           | NOTNULL      | STABLE       | WAL          |
+| COPY         | IF           | NOW          | STABLES      | WHERE        |
 
diff --git a/documentation20/cn/12.taos-sql/docs.md b/documentation20/cn/12.taos-sql/docs.md
index 5904abbbaa..764560dbeb 100644
--- a/documentation20/cn/12.taos-sql/docs.md
+++ b/documentation20/cn/12.taos-sql/docs.md
@@ -89,13 +89,13 @@ TDengine 缺省的时间戳是毫秒精度，但通过在 CREATE DATABASE 时传
     ```mysql
     USE db_name;
     ```
-    使用/切换数据库
+    使用/切换数据库（在 RESTful 连接方式下无效）。
 
 - **删除数据库**
     ```mysql
     DROP DATABASE [IF EXISTS] db_name;
     ```
-    删除数据库。所包含的全部数据表将被删除，谨慎使用
+    删除数据库。指定 Database 所包含的全部数据表将被删除，谨慎使用！
 
 - **修改数据库参数**
     ```mysql
@@ -279,11 +279,11 @@ TDengine 缺省的时间戳是毫秒精度，但通过在 CREATE DATABASE 时传
 
     说明：
 
-    1) TAGS 列的数据类型不能是 timestamp 类型；
+    1) TAGS 列的数据类型不能是 timestamp 类型；（从 2.1.3.0 版本开始，TAGS 列中支持使用 timestamp 类型，但需注意在 TAGS 中的 timestamp 列写入数据时需要提供给定值，而暂不支持四则运算，例如 `NOW + 10s` 这类表达式）
 
     2) TAGS 列名不能与其他列名相同；
 
-    3) TAGS 列名不能为预留关键字；
+    3) TAGS 列名不能为预留关键字（参见：[参数限制与保留关键字](https://www.taosdata.com/cn/documentation/administrator#keywords) 章节）；
 
     4) TAGS 最多允许 128 个，至少 1 个，总长度不超过 16 KB。
 
@@ -703,22 +703,24 @@ Query OK, 1 row(s) in set (0.001091s)
 
 ### 支持的条件过滤操作
 
-| **Operation**   | **Note**                      | **Applicable Data Types**             |
-| --------------- | ----------------------------- | ------------------------------------- |
-| >               | larger than                   | **`timestamp`** and all numeric types |
-| <               | smaller than                  | **`timestamp`** and all numeric types |
-| >=              | larger than or equal to       | **`timestamp`** and all numeric types |
-| <=              | smaller than or equal to      | **`timestamp`** and all numeric types |
-| =               | equal to                      | all types                             |
-| <>              | not equal to                  | all types                             |
-| between and     | within a certain range        | **`timestamp`** and all numeric types |
-| %               | match with any char sequences | **`binary`** **`nchar`**              |
-| _               | match with a single char      | **`binary`** **`nchar`**              |
+| **Operation**   | **Note**                      | **Applicable Data Types**                 |
+| --------------- | ----------------------------- | ----------------------------------------- |
+| >               | larger than                   | **`timestamp`** and all numeric types     |
+| <               | smaller than                  | **`timestamp`** and all numeric types     |
+| >=              | larger than or equal to       | **`timestamp`** and all numeric types     |
+| <=              | smaller than or equal to      | **`timestamp`** and all numeric types     |
+| =               | equal to                      | all types                                 |
+| <>              | not equal to                  | all types                                 |
+| between and     | within a certain range        | **`timestamp`** and all numeric types     |
+| in              | matches any value in a set    | all types except first column `timestamp` |
+| %               | match with any char sequences | **`binary`** **`nchar`**                  |
+| _               | match with a single char      | **`binary`** **`nchar`**                  |
 
 1. <> 算子也可以写为 != ，请注意，这个算子不能用于数据表第一列的 timestamp 字段。
 2. 同时进行多个字段的范围过滤，需要使用关键词 AND 来连接不同的查询条件，暂不支持 OR 连接的不同列之间的查询过滤条件。
-3. 针对单一字段的过滤，如果是时间过滤条件，则一条语句中只支持设定一个；但针对其他的（普通）列或标签列，则可以使用 `OR` 关键字进行组合条件的查询过滤。例如：((value > 20 AND value < 30) OR (value < 12)) 。
-4. 从 2.0.17 版本开始，条件过滤开始支持 BETWEEN AND 语法，例如 `WHERE col2 BETWEEN 1.5 AND 3.25` 表示查询条件为“1.5 ≤ col2 ≤ 3.25”。
+3. 针对单一字段的过滤，如果是时间过滤条件，则一条语句中只支持设定一个；但针对其他的（普通）列或标签列，则可以使用 `OR` 关键字进行组合条件的查询过滤。例如： `((value > 20 AND value < 30) OR (value < 12))`。
+4. 从 2.0.17.0 版本开始，条件过滤开始支持 BETWEEN AND 语法，例如 `WHERE col2 BETWEEN 1.5 AND 3.25` 表示查询条件为“1.5 ≤ col2 ≤ 3.25”。
+5. 从 2.1.4.0 版本开始，条件过滤开始支持 IN 算子，例如 `WHERE city IN ('Beijing', 'Shanghai')`。说明：BOOL 类型写作 `{true, false}` 或 `{0, 1}` 均可，但不能写作 0、1 之外的整数；FLOAT 和 DOUBLE 类型会受到浮点数精度影响，集合内的值在精度范围内认为和数据行的值完全相等才能匹配成功。<!-- REPLACE_OPEN_TO_ENTERPRISE__IN_OPERATOR_AND_UNSIGNED_INTEGER -->
 
 <!-- 
 <a class="anchor" id="having"></a>
@@ -854,7 +856,23 @@ TDengine支持针对数据的聚合查询。提供支持的聚合和选择函数
 
     应用字段：不能应用在timestamp、binary、nchar、bool类型字段。
 
-    适用于：**表**。
+    适用于：**表、（超级表）**。
+
+    说明：从 2.1.3.0 版本开始，TWA 函数可以在由 GROUP BY 划分出单独时间线的情况下用于超级表（也即 GROUP BY tbname）。
+
+- **IRATE**
+    ```mysql
+    SELECT IRATE(field_name) FROM tb_name WHERE clause;
+    ```
+    功能说明：计算瞬时增长率。使用时间区间中最后两个样本数据来计算瞬时增长速率；如果这两个值呈递减关系，那么只取最后一个数用于计算，而不是使用二者差值。
+
+    返回结果数据类型：双精度浮点数Double。
+
+    应用字段：不能应用在timestamp、binary、nchar、bool类型字段。
+
+    适用于：**表、（超级表）**。
+
+    说明：（从 2.1.3.0 版本开始新增此函数）IRATE 可以在由 GROUP BY 划分出单独时间线的情况下用于超级表（也即 GROUP BY tbname）。
 
 - **SUM**
     ```mysql
@@ -1203,13 +1221,14 @@ TDengine支持针对数据的聚合查询。提供支持的聚合和选择函数
     ```
 
 ### 计算函数
+
 - **DIFF**
     ```mysql
     SELECT DIFF(field_name) FROM tb_name [WHERE clause];
     ```
     功能说明：统计表中某列的值与前一行对应值的差。
 
-    返回结果数据类型： 同应用字段。
+    返回结果数据类型：同应用字段。
 
     应用字段：不能应用在timestamp、binary、nchar、bool类型字段。
 
@@ -1227,13 +1246,27 @@ TDengine支持针对数据的聚合查询。提供支持的聚合和选择函数
     Query OK, 2 row(s) in set (0.001162s)
     ```
 
+- **DERIVATIVE**
+    ```mysql
+    SELECT DERIVATIVE(field_name, time_interval, ignore_negative) FROM tb_name [WHERE clause];
+    ```
+    功能说明：统计表中某列数值的单位变化率。其中单位时间区间的长度可以通过 time_interval 参数指定，最小可以是 1 秒（1s）；ignore_negative 参数的值可以是 0 或 1，为 1 时表示忽略负值。
+
+    返回结果数据类型：双精度浮点数。
+
+    应用字段：不能应用在 timestamp、binary、nchar、bool 类型字段。
+
+    适用于：**表、（超级表）**。
+
+    说明：（从 2.1.3.0 版本开始新增此函数）输出结果行数是范围内总行数减一，第一行没有结果输出。DERIVATIVE 函数可以在由 GROUP BY 划分出单独时间线的情况下用于超级表（也即 GROUP BY tbname）。
+
 - **SPREAD**
     ```mysql
     SELECT SPREAD(field_name) FROM { tb_name | stb_name } [WHERE clause];
     ```
     功能说明：统计表/超级表中某列的最大值和最小值之差。
 
-    返回结果数据类型： 双精度浮点数。
+    返回结果数据类型：双精度浮点数。
 
     应用字段：不能应用在binary、nchar、bool类型字段。
 
diff --git a/documentation20/cn/13.faq/docs.md b/documentation20/cn/13.faq/docs.md
index 8d18ae269d..300ff27fe4 100644
--- a/documentation20/cn/13.faq/docs.md
+++ b/documentation20/cn/13.faq/docs.md
@@ -87,6 +87,7 @@
 
 TDengine还没有一组专用的validation queries。然而建议你使用系统监测的数据库”log"来做。
 
+<a class="anchor" id="update"></a>
 ## 9. 我可以删除或更新一条记录吗？
 
 TDengine 目前尚不支持删除功能，未来根据用户需求可能会支持。
diff --git a/documentation20/en/08.connector/docs.md b/documentation20/en/08.connector/docs.md
index 3da9937f98..9b3940a2e8 100644
--- a/documentation20/en/08.connector/docs.md
+++ b/documentation20/en/08.connector/docs.md
@@ -515,6 +515,13 @@ c1.close()
 conn.close()
 ```
 
+#### Using nanosecond in Python connector
+
+So far Python still does not completely support nanosecond type. Please refer to the link 1 and 2. The implementation of the python connector is to return an integer number for nanosecond value rather than datatime type as what ms and us do. The developer needs to handle it themselves. We recommend using pandas to_datetime() function. If Python officially support nanosecond in the future, TAOS Data might be possible to change the interface accordingly, which mean the application need change too.
+
+1. https://stackoverflow.com/questions/10611328/parsing-datetime-strings-containing-nanoseconds
+2. https://www.python.org/dev/peps/pep-0564/
+
 #### Helper
 
 Users can directly view the usage information of the module through Python's helper, or refer to the sample program in tests/examples/Python. The following are some common classes and methods:
diff --git a/src/balance/src/bnMain.c b/src/balance/src/bnMain.c
index f022fff6d8..9997d44ca5 100644
--- a/src/balance/src/bnMain.c
+++ b/src/balance/src/bnMain.c
@@ -637,6 +637,19 @@ int32_t bnDropDnode(SDnodeObj *pDnode) {
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t bnDnodeCanCreateMnode(struct SDnodeObj *pDnode) {
+  if (pDnode == NULL)
+    return 0;
+
+  if (pDnode->isMgmt || pDnode->alternativeRole == TAOS_DN_ALTERNATIVE_ROLE_VNODE
+      || pDnode->status == TAOS_DN_STATUS_DROPPING
+      || pDnode->status == TAOS_DN_STATUS_OFFLINE) {
+    return 0;
+  } else {
+    return 1;
+  }
+}
+
 static void bnMonitorDnodeModule() {
   int32_t numOfMnodes = mnodeGetMnodesNum();
   if (numOfMnodes >= tsNumOfMnodes) return;
@@ -645,13 +658,7 @@ static void bnMonitorDnodeModule() {
     SDnodeObj *pDnode = tsBnDnodes.list[i];
     if (pDnode == NULL) break;
 
-    if (pDnode->isMgmt || pDnode->status == TAOS_DN_STATUS_DROPPING || pDnode->status == TAOS_DN_STATUS_OFFLINE) {
-      continue;
-    }
-
-    if (pDnode->alternativeRole == TAOS_DN_ALTERNATIVE_ROLE_VNODE) {
-      continue;
-    }
+    if (!bnDnodeCanCreateMnode(pDnode)) continue;
 
     mLInfo("dnode:%d, numOfMnodes:%d expect:%d, create mnode in this dnode", pDnode->dnodeId, numOfMnodes, tsNumOfMnodes);
     mnodeCreateMnode(pDnode->dnodeId, pDnode->dnodeEp, true);
diff --git a/src/client/src/tscGlobalmerge.c b/src/client/src/tscGlobalmerge.c
index d835b37c24..ffec03b65a 100644
--- a/src/client/src/tscGlobalmerge.c
+++ b/src/client/src/tscGlobalmerge.c
@@ -898,7 +898,9 @@ SSDataBlock* doGlobalAggregate(void* param, bool* newgroup) {
   SSDataBlock* pBlock = NULL;
   while(1) {
     bool prev = *newgroup;
+    publishOperatorProfEvent(upstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
     pBlock = upstream->exec(upstream, newgroup);
+    publishOperatorProfEvent(upstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
     if (pBlock == NULL) {
       *newgroup = prev;
       break;
@@ -966,7 +968,9 @@ static SSDataBlock* skipGroupBlock(SOperatorInfo* pOperator, bool* newgroup) {
 
   SSDataBlock* pBlock = NULL;
   if (pInfo->currentGroupOffset == 0) {
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
     pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
     if (pBlock == NULL) {
       setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
       pOperator->status = OP_EXEC_DONE;
@@ -974,7 +978,9 @@ static SSDataBlock* skipGroupBlock(SOperatorInfo* pOperator, bool* newgroup) {
 
     if (*newgroup == false && pInfo->limit.limit > 0 && pInfo->rowsTotal >= pInfo->limit.limit) {
       while ((*newgroup) == false) {  // ignore the remain blocks
+        publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
         pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+        publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
         if (pBlock == NULL) {
           setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
           pOperator->status = OP_EXEC_DONE;
@@ -986,7 +992,10 @@ static SSDataBlock* skipGroupBlock(SOperatorInfo* pOperator, bool* newgroup) {
     return pBlock;
   }
 
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
     pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
       pOperator->status = OP_EXEC_DONE;
@@ -1000,7 +1009,10 @@ static SSDataBlock* skipGroupBlock(SOperatorInfo* pOperator, bool* newgroup) {
       }
 
       while ((*newgroup) == false) {
+        publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
         pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+        publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
+
         if (pBlock == NULL) {
           setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
           pOperator->status = OP_EXEC_DONE;
diff --git a/src/client/src/tscLocal.c b/src/client/src/tscLocal.c
index 2c9717306f..668a9e9406 100644
--- a/src/client/src/tscLocal.c
+++ b/src/client/src/tscLocal.c
@@ -485,6 +485,7 @@ static int32_t tscGetDBInfo(SCreateBuilder *builder, char *result) {
 
   char buf[TSDB_DB_NAME_LEN + 64] = {0}; 
   do {
+    memset(buf, 0, sizeof(buf));
     int32_t* lengths = taos_fetch_lengths(pSql);  
     int32_t ret = tscGetNthFieldResult(row, fields, lengths, 0, buf);
     if (0 == ret && STR_NOCASE_EQUAL(buf, strlen(buf), builder->buf, strlen(builder->buf))) {
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 329c9eee8f..253529c5d1 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -165,6 +165,7 @@ bool serializeExprListToVariant(SArray* pList, tVariant **dst, int16_t colType,
   } else {
     tbufWriteUint32(&bw, colType);
   }
+
   tbufWriteInt32(&bw, (int32_t)(pList->size));
 
   for (int32_t i = 0; i < (int32_t)pList->size; i++) {
@@ -181,10 +182,11 @@ bool serializeExprListToVariant(SArray* pList, tVariant **dst, int16_t colType,
       }  
       tbufWriteInt64(&bw, var->i64);        
     } else if (IS_UNSIGNED_NUMERIC_TYPE(colType)) {
-      if (IS_SIGNED_NUMERIC_TYPE(var->nType) && IS_UNSIGNED_NUMERIC_TYPE(var->nType)) {
+      if (IS_SIGNED_NUMERIC_TYPE(var->nType) || IS_UNSIGNED_NUMERIC_TYPE(var->nType)) {
+        tbufWriteUint64(&bw, var->u64);        
+      } else {
         break;
-      } 
-      tbufWriteUint64(&bw, var->u64);        
+      }
     } else if (colType == TSDB_DATA_TYPE_DOUBLE || colType == TSDB_DATA_TYPE_FLOAT) {
       if (IS_SIGNED_NUMERIC_TYPE(var->nType) || IS_UNSIGNED_NUMERIC_TYPE(var->nType)) {
         tbufWriteDouble(&bw, (double)(var->i64));
@@ -3342,6 +3344,7 @@ static int32_t doExtractColumnFilterInfo(SSqlCmd* pCmd, SQueryInfo* pQueryInfo,
     if (pRight->flags & (1 << EXPR_FLAG_NS_TIMESTAMP)) {
       pRight->value.i64 =
           convertTimePrecision(pRight->value.i64, TSDB_TIME_PRECISION_NANO, timePrecision);
+      pRight->flags &= ~(1 << EXPR_FLAG_NS_TIMESTAMP);
     }
   }
 
@@ -4906,6 +4909,7 @@ int32_t getTimeRange(STimeWindow* win, tSqlExpr* pRight, int32_t optr, int16_t t
      */
     if (pRight->flags & (1 << EXPR_FLAG_NS_TIMESTAMP)) {
       pRight->value.i64 = convertTimePrecision(pRight->value.i64, TSDB_TIME_PRECISION_NANO, timePrecision);
+      pRight->flags &= ~(1 << EXPR_FLAG_NS_TIMESTAMP);
     }
 
     tVariantDump(&pRight->value, (char*)&val, TSDB_DATA_TYPE_BIGINT, true);
@@ -5103,7 +5107,7 @@ static void setDefaultOrderInfo(SQueryInfo* pQueryInfo) {
 int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSqlNode, SSchema* pSchema) {
   const char* msg0 = "only support order by primary timestamp";
   const char* msg1 = "invalid column name";
-  const char* msg2 = "order by primary timestamp or first tag in groupby clause allowed";
+  const char* msg2 = "order by primary timestamp, first tag or groupby column in groupby clause allowed";
   const char* msg3 = "invalid column in order by clause, only primary timestamp or first tag in groupby clause allowed";
 
   setDefaultOrderInfo(pQueryInfo);
@@ -5156,6 +5160,7 @@ int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSq
 
     bool orderByTags = false;
     bool orderByTS = false;
+    bool orderByGroupbyCol = false;
 
     if (index.columnIndex >= tscGetNumOfColumns(pTableMetaInfo->pTableMeta)) {
       int32_t relTagIndex = index.columnIndex - tscGetNumOfColumns(pTableMetaInfo->pTableMeta);
@@ -5175,11 +5180,18 @@ int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSq
     if (PRIMARYKEY_TIMESTAMP_COL_INDEX == index.columnIndex) {
       orderByTS = true;
     }
-
-    if (!(orderByTags || orderByTS) && !isTopBottomQuery(pQueryInfo)) {
+    
+    SArray *columnInfo = pQueryInfo->groupbyExpr.columnInfo;
+    if (columnInfo != NULL && taosArrayGetSize(columnInfo) > 0) {
+      SColIndex* pColIndex = taosArrayGet(columnInfo, 0);
+      if (PRIMARYKEY_TIMESTAMP_COL_INDEX != index.columnIndex && pColIndex->colIndex == index.columnIndex) {
+        orderByGroupbyCol = true; 
+      }
+    } 
+    if (!(orderByTags || orderByTS || orderByGroupbyCol) && !isTopBottomQuery(pQueryInfo)) {
       return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg3);
     } else {  // order by top/bottom result value column is not supported in case of interval query.
-      assert(!(orderByTags && orderByTS));
+      assert(!(orderByTags && orderByTS && orderByGroupbyCol));
     }
 
     size_t s = taosArrayGetSize(pSortorder);
@@ -5189,6 +5201,11 @@ int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSq
 
         tVariantListItem* p1 = taosArrayGet(pSqlNode->pSortOrder, 0);
         pQueryInfo->groupbyExpr.orderType = p1->sortOrder;
+      } else if (orderByGroupbyCol) {
+        tVariantListItem* p1 = taosArrayGet(pSqlNode->pSortOrder, 0);
+
+        pQueryInfo->groupbyExpr.orderType = p1->sortOrder;
+        pQueryInfo->order.orderColId = pSchema[index.columnIndex].colId;
       } else if (isTopBottomQuery(pQueryInfo)) {
         /* order of top/bottom query in interval is not valid  */
         SExprInfo* pExpr = tscExprGet(pQueryInfo, 0);
@@ -5221,6 +5238,9 @@ int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSq
       if (orderByTags) {
         pQueryInfo->groupbyExpr.orderIndex = index.columnIndex - tscGetNumOfColumns(pTableMetaInfo->pTableMeta);
         pQueryInfo->groupbyExpr.orderType = pItem->sortOrder;
+      } else if (orderByGroupbyCol){
+        pQueryInfo->order.order = pItem->sortOrder;
+        pQueryInfo->order.orderColId = index.columnIndex;
       } else {
         pQueryInfo->order.order = pItem->sortOrder;
         pQueryInfo->order.orderColId = PRIMARYKEY_TIMESTAMP_COL_INDEX;
@@ -5246,9 +5266,20 @@ int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSq
     if (getColumnIndexByName(pCmd, &columnName, pQueryInfo, &index) != TSDB_CODE_SUCCESS) {
       return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg1);
     }
-
     if (index.columnIndex != PRIMARYKEY_TIMESTAMP_COL_INDEX && !isTopBottomQuery(pQueryInfo)) {
-      return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg2);
+      bool validOrder = false;
+      SArray *columnInfo = pQueryInfo->groupbyExpr.columnInfo;
+      if (columnInfo != NULL && taosArrayGetSize(columnInfo) > 0) {
+        SColIndex* pColIndex = taosArrayGet(columnInfo, 0);
+        validOrder = (pColIndex->colIndex == index.columnIndex); 
+      }  
+      if (!validOrder) {
+        return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg2);
+      }     
+      tVariantListItem* p1 = taosArrayGet(pSqlNode->pSortOrder, 0);
+      pQueryInfo->groupbyExpr.orderIndex = pSchema[index.columnIndex].colId; 
+      pQueryInfo->groupbyExpr.orderType = p1->sortOrder; 
+      
     }
 
     if (isTopBottomQuery(pQueryInfo)) {
@@ -5269,6 +5300,7 @@ int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSq
 
     tVariantListItem* pItem = taosArrayGet(pSqlNode->pSortOrder, 0);
     pQueryInfo->order.order = pItem->sortOrder;
+    pQueryInfo->order.orderColId = pSchema[index.columnIndex].colId;
   }
 
   return TSDB_CODE_SUCCESS;
@@ -7785,6 +7817,7 @@ int32_t validateSqlNode(SSqlObj* pSql, SSqlNode* pSqlNode, SQueryInfo* pQueryInf
   const char* msg5 = "only tag query not compatible with normal column filter";
   const char* msg6 = "not support stddev/percentile/interp in the outer query yet";
   const char* msg7 = "derivative/twa/irate requires timestamp column exists in subquery";
+  const char* msg8 = "condition missing for join query";
 
   int32_t code = TSDB_CODE_SUCCESS;
 
@@ -7870,6 +7903,10 @@ int32_t validateSqlNode(SSqlObj* pSql, SSqlNode* pSqlNode, SQueryInfo* pQueryInf
       if (validateWhereNode(pQueryInfo, &pSqlNode->pWhere, pSql) != TSDB_CODE_SUCCESS) {
         return TSDB_CODE_TSC_INVALID_OPERATION;
       }
+    } else {
+      if (pQueryInfo->numOfTables > 1) {
+        return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg8);
+      }
     }
 
     // validate the interval info
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 1ec006746e..7cd11cfe4b 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -484,8 +484,8 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg, SRpcEpSet *pEpSet) {
   }
 
   if (shouldFree) { // in case of table-meta/vgrouplist query, automatically free it
-    taosRemoveRef(tscObjRef, handle);
     tscDebug("0x%"PRIx64" sqlObj is automatically freed", pSql->self);
+    taosRemoveRef(tscObjRef, handle);
   }
 
   taosReleaseRef(tscObjRef, handle);
diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index c3df4773e1..4d97fef52f 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -3604,10 +3604,10 @@ void* createQInfoFromQueryNode(SQueryInfo* pQueryInfo, STableGroupInfo* pTableGr
 
   // todo refactor: filter should not be applied here.
   createFilterInfo(pQueryAttr, 0);
-  pQueryAttr->numOfFilterCols = 0;
 
   SArray* pa = NULL;
   if (stage == MASTER_SCAN) {
+    pQueryAttr->createFilterOperator = false;  // no need for parent query
     pa = createExecOperatorPlan(pQueryAttr);
   } else {
     pa = createGlobalMergePlan(pQueryAttr);
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index d366f4c4c7..1f93d9df7f 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -825,7 +825,10 @@ static void fetchNextBlockIfCompleted(SOperatorInfo* pOperator, bool* newgroup)
     SJoinStatus* pStatus = &pJoinInfo->status[i];
     if (pStatus->pBlock == NULL || pStatus->index >= pStatus->pBlock->info.rows) {
       tscDebug("Retrieve nest query result, index:%d, total:%d", i, pOperator->numOfUpstream);
+
+      publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
       pStatus->pBlock = pOperator->upstream[i]->exec(pOperator->upstream[i], newgroup);
+      publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
       pStatus->index = 0;
 
       if (pStatus->pBlock == NULL) {
@@ -1304,7 +1307,7 @@ void tscResetSqlCmd(SSqlCmd* pCmd, bool clearCachedMeta) {
   if (pCmd->pTableMetaMap != NULL) {
     STableMetaVgroupInfo* p = taosHashIterate(pCmd->pTableMetaMap, NULL);
     while (p) {
-      tfree(p->pVgroupInfo);
+      tscVgroupInfoClear(p->pVgroupInfo);
       tfree(p->pTableMeta);
       p = taosHashIterate(pCmd->pTableMetaMap, p);
     }
@@ -3524,6 +3527,7 @@ void executeQuery(SSqlObj* pSql, SQueryInfo* pQueryInfo) {
 
     pSql->pSubs = calloc(pSql->subState.numOfSub, POINTER_BYTES);
     pSql->subState.states = calloc(pSql->subState.numOfSub, sizeof(int8_t));
+    pthread_mutex_init(&pSql->subState.mutex, NULL);
 
     for(int32_t i = 0; i < pSql->subState.numOfSub; ++i) {
       SQueryInfo* pSub = taosArrayGetP(pQueryInfo->pUpstream, i);
@@ -4080,7 +4084,10 @@ SVgroupsInfo* tscVgroupsInfoDup(SVgroupsInfo* pVgroupsInfo) {
 
   size_t size = sizeof(SVgroupInfo) * pVgroupsInfo->numOfVgroups + sizeof(SVgroupsInfo);
   SVgroupsInfo* pInfo = calloc(1, size);
-  memcpy(pInfo, pVgroupsInfo, size);
+  pInfo->numOfVgroups = pVgroupsInfo->numOfVgroups;
+  for (int32_t m = 0; m < pVgroupsInfo->numOfVgroups; ++m) {
+    tscSVgroupInfoCopy(&pInfo->vgroups[m], &pVgroupsInfo->vgroups[m]);
+  }
   return pInfo;
 }
 
diff --git a/src/client/tests/cliTest.cpp b/src/client/tests/cliTest.cpp
index 30f248b541..c2799c7ff6 100644
--- a/src/client/tests/cliTest.cpp
+++ b/src/client/tests/cliTest.cpp
@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 #include <iostream>
+#include <inttypes.h>
 
 #include "taos.h"
 #include "tglobal.h"
@@ -132,7 +133,7 @@ void validateResultFields() {
   taos_free_result(res);
 
   char sql[512] = {0};
-  sprintf(sql, "insert into t1 values(%ld, 99, 'abc', 'test')", start_ts);
+  sprintf(sql, "insert into t1 values(%" PRId64 ", 99, 'abc', 'test')", start_ts);
 
   res = taos_query(conn, sql);
   ASSERT_EQ(taos_errno(res), 0);
diff --git a/src/client/tests/timeParseTest.cpp b/src/client/tests/timeParseTest.cpp
index 3cc6d541e0..f6de5d46a7 100644
--- a/src/client/tests/timeParseTest.cpp
+++ b/src/client/tests/timeParseTest.cpp
@@ -1,8 +1,10 @@
-#include "os.h"
+
 #include <gtest/gtest.h>
 #include <cassert>
 #include <iostream>
+#include <inttypes.h>
 
+#include "os.h"
 #include "taos.h"
 #include "ttoken.h"
 #include "tutil.h"
@@ -15,10 +17,10 @@ int main(int argc, char** argv) {
 extern void deltaToUtcInitOnce();
 /* test parse time function */
 TEST(testCase, parse_time) {
-  
+
   taos_options(TSDB_OPTION_TIMEZONE, "GMT-8");
   deltaToUtcInitOnce();
-  
+
   char t1[] = "2018-1-1 1:1:1.952798";
   char t13[] = "1970-1-1 0:0:0";
 
@@ -77,15 +79,15 @@ TEST(testCase, parse_time) {
   taosParseTime(t12, &time1, strlen(t12), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, time1);
 
-  taos_options(TSDB_OPTION_TIMEZONE, "UTC");  
+  taos_options(TSDB_OPTION_TIMEZONE, "UTC");
   deltaToUtcInitOnce();
-  
+
   taosParseTime(t13, &time, strlen(t13), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, 0);
 
   taos_options(TSDB_OPTION_TIMEZONE, "Asia/Shanghai");
   deltaToUtcInitOnce();
-  
+
   char t14[] = "1970-1-1T0:0:0Z";
   taosParseTime(t14, &time, strlen(t14), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, 0);
@@ -135,7 +137,7 @@ TEST(testCase, parse_time) {
 
 
   //======================== add some case ============================//
-  
+
   char b1[] = "9999-12-31 23:59:59.999";
   taosParseTime(b1, &time, strlen(b1), TSDB_TIME_PRECISION_MILLI,0);
   EXPECT_EQ(time, 253402271999999);
@@ -145,27 +147,27 @@ TEST(testCase, parse_time) {
   taosParseTime(b2, &time, strlen(b2), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, 1577811661321);
 
-  taos_options(TSDB_OPTION_TIMEZONE, "America/New_York");  
+  taos_options(TSDB_OPTION_TIMEZONE, "America/New_York");
   deltaToUtcInitOnce();
-  
+
   taosParseTime(t13, &time, strlen(t13), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, 18000 * MILLISECOND_PER_SECOND);
 
-  taos_options(TSDB_OPTION_TIMEZONE, "Asia/Tokyo");  
+  taos_options(TSDB_OPTION_TIMEZONE, "Asia/Tokyo");
   deltaToUtcInitOnce();
-  
+
   taosParseTime(t13, &time, strlen(t13), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, -32400 * MILLISECOND_PER_SECOND);
 
   taos_options(TSDB_OPTION_TIMEZONE, "Asia/Shanghai");
   deltaToUtcInitOnce();
-  
+
   taosParseTime(t13, &time, strlen(t13), TSDB_TIME_PRECISION_MILLI, 0);
   EXPECT_EQ(time, -28800 * MILLISECOND_PER_SECOND);
 
   char t[] = "2021-01-08T02:11:40.000+00:00";
   taosParseTime(t, &time, strlen(t), TSDB_TIME_PRECISION_MILLI, 0);
-  printf("%ld\n", time);
+  printf("%" PRId64 "\n", time);
 }
 
 
diff --git a/src/connector/jdbc/CMakeLists.txt b/src/connector/jdbc/CMakeLists.txt
index 1db8361faf..9642b0490f 100644
--- a/src/connector/jdbc/CMakeLists.txt
+++ b/src/connector/jdbc/CMakeLists.txt
@@ -8,7 +8,7 @@ IF (TD_MVN_INSTALLED)
   ADD_CUSTOM_COMMAND(OUTPUT ${JDBC_CMD_NAME}
     POST_BUILD
     COMMAND mvn -Dmaven.test.skip=true install -f ${CMAKE_CURRENT_SOURCE_DIR}/pom.xml
-    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/target/taos-jdbcdriver-2.0.31.jar ${LIBRARY_OUTPUT_PATH}
+    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/target/taos-jdbcdriver-2.0.32-dist.jar ${LIBRARY_OUTPUT_PATH}
     COMMAND mvn -Dmaven.test.skip=true clean -f ${CMAKE_CURRENT_SOURCE_DIR}/pom.xml
     COMMENT "build jdbc driver")
   ADD_CUSTOM_TARGET(${JDBC_TARGET_NAME} ALL WORKING_DIRECTORY ${EXECUTABLE_OUTPUT_PATH} DEPENDS ${JDBC_CMD_NAME})
diff --git a/src/connector/jdbc/deploy-pom.xml b/src/connector/jdbc/deploy-pom.xml
index 8f77582d30..06122372f0 100755
--- a/src/connector/jdbc/deploy-pom.xml
+++ b/src/connector/jdbc/deploy-pom.xml
@@ -5,7 +5,7 @@
 
   <groupId>com.taosdata.jdbc</groupId>
   <artifactId>taos-jdbcdriver</artifactId>
-  <version>2.0.31</version>
+  <version>2.0.32</version>
   <packaging>jar</packaging>
 
   <name>JDBCDriver</name>
diff --git a/src/connector/jdbc/pom.xml b/src/connector/jdbc/pom.xml
index a3a36d54cf..61d7fb85ef 100644
--- a/src/connector/jdbc/pom.xml
+++ b/src/connector/jdbc/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.taosdata.jdbc</groupId>
     <artifactId>taos-jdbcdriver</artifactId>
-    <version>2.0.31</version>
+    <version>2.0.32</version>
     <packaging>jar</packaging>
     <name>JDBCDriver</name>
     <url>https://github.com/taosdata/TDengine/tree/master/src/connector/jdbc</url>
@@ -113,16 +113,16 @@
                         <include>**/*Test.java</include>
                     </includes>
                     <excludes>
-                        <exclude>**/TSDBJNIConnectorTest.java</exclude>
-                        <exclude>**/UnsignedNumberJniTest.java</exclude>
-                        <exclude>**/DatetimeBefore1970Test.java</exclude>
                         <exclude>**/AppMemoryLeakTest.java</exclude>
                         <exclude>**/AuthenticationTest.java</exclude>
-                        <exclude>**/TaosInfoMonitorTest.java</exclude>
+                        <exclude>**/ConnectMultiTaosdByRestfulWithDifferentTokenTest.java</exclude>
+                        <exclude>**/DatetimeBefore1970Test.java</exclude>
                         <exclude>**/FailOverTest.java</exclude>
                         <exclude>**/InvalidResultSetPointerTest.java</exclude>
                         <exclude>**/RestfulConnectionTest.java</exclude>
-                        <exclude>**/ConnectMultiTaosdByRestfulWithDifferentTokenTest.java</exclude>
+                        <exclude>**/TSDBJNIConnectorTest.java</exclude>
+                        <exclude>**/TaosInfoMonitorTest.java</exclude>
+                        <exclude>**/UnsignedNumberJniTest.java</exclude>
                     </excludes>
                     <testFailureIgnore>true</testFailureIgnore>
                 </configuration>
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractConnection.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractConnection.java
index 686ef36262..b3887d436b 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractConnection.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractConnection.java
@@ -1,6 +1,6 @@
 package com.taosdata.jdbc;
 
-import com.taosdata.jdbc.rs.enums.TimestampFormat;
+import com.taosdata.jdbc.enums.TimestampFormat;
 
 import java.sql.*;
 import java.util.Enumeration;
@@ -306,9 +306,6 @@ public abstract class AbstractConnection extends WrapperImpl implements Connecti
 
     @Override
     public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
-        if (isClosed())
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-
         switch (resultSetHoldability) {
             case ResultSet.HOLD_CURSORS_OVER_COMMIT:
                 break;
@@ -322,11 +319,7 @@ public abstract class AbstractConnection extends WrapperImpl implements Connecti
     }
 
     @Override
-    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)
-            throws SQLException {
-        if (isClosed())
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-
+    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
         switch (resultSetHoldability) {
             case ResultSet.HOLD_CURSORS_OVER_COMMIT:
                 break;
@@ -425,7 +418,7 @@ public abstract class AbstractConnection extends WrapperImpl implements Connecti
                 status = resultSet.getInt("server_status()");
                 resultSet.close();
             }
-            return status == 1 ? true : false;
+            return status == 1;
         });
 
         boolean status = false;
@@ -434,9 +427,7 @@ public abstract class AbstractConnection extends WrapperImpl implements Connecti
                 status = future.get();
             else
                 status = future.get(timeout, TimeUnit.SECONDS);
-        } catch (InterruptedException e) {
-            e.printStackTrace();
-        } catch (ExecutionException e) {
+        } catch (InterruptedException | ExecutionException e) {
             e.printStackTrace();
         } catch (TimeoutException e) {
             future.cancel(true);
@@ -452,8 +443,7 @@ public abstract class AbstractConnection extends WrapperImpl implements Connecti
         if (isClosed)
             throw (SQLClientInfoException) TSDBError.createSQLException(TSDBErrorNumbers.ERROR_SQLCLIENT_EXCEPTION_ON_CONNECTION_CLOSED);
 
-        if (clientInfoProps != null)
-            clientInfoProps.setProperty(name, value);
+        clientInfoProps.setProperty(name, value);
     }
 
     @Override
@@ -461,8 +451,8 @@ public abstract class AbstractConnection extends WrapperImpl implements Connecti
         if (isClosed)
             throw (SQLClientInfoException) TSDBError.createSQLException(TSDBErrorNumbers.ERROR_SQLCLIENT_EXCEPTION_ON_CONNECTION_CLOSED);
 
-        for (Enumeration<Object> enumer = properties.keys(); enumer.hasMoreElements(); ) {
-            String name = (String) enumer.nextElement();
+        for (Enumeration<Object> enumeration = properties.keys(); enumeration.hasMoreElements(); ) {
+            String name = (String) enumeration.nextElement();
             clientInfoProps.put(name, properties.getProperty(name));
         }
     }
@@ -528,14 +518,13 @@ public abstract class AbstractConnection extends WrapperImpl implements Connecti
         if (milliseconds < 0)
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_VARIABLE);
 
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+        // do nothing
     }
 
     @Override
     public int getNetworkTimeout() throws SQLException {
         if (isClosed())
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED);
-
-        throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
+        return 0;
     }
 }
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDatabaseMetaData.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDatabaseMetaData.java
index 48811d30a6..3c9c784f59 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDatabaseMetaData.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDatabaseMetaData.java
@@ -12,8 +12,7 @@ public abstract class AbstractDatabaseMetaData extends WrapperImpl implements Da
     private final static int DRIVER_MAJAR_VERSION = 2;
     private final static int DRIVER_MINOR_VERSION = 0;
 
-    private String precision = "ms";
-    private String database;
+    private String precision = TSDBConstants.DEFAULT_PRECISION;
 
     public boolean allProceduresAreCallable() throws SQLException {
         return false;
@@ -1223,7 +1222,6 @@ public abstract class AbstractDatabaseMetaData extends WrapperImpl implements Da
             ResultSet databases = stmt.executeQuery("show databases");
             while (databases.next()) {
                 String dbname = databases.getString("name");
-                this.database = dbname;
                 this.precision = databases.getString("precision");
                 if (dbname.equalsIgnoreCase(catalog))
                     return true;
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDriver.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDriver.java
index 5eaac1cd3b..7d4a268391 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDriver.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractDriver.java
@@ -58,7 +58,7 @@ public abstract class AbstractDriver implements Driver {
                         value = parameterValuePair.substring(indexOfEqual + 1);
                     }
                 }
-                if ((value != null && value.length() > 0) && (parameter != null && parameter.length() > 0)) {
+                if (value != null && value.length() > 0 && parameter.length() > 0) {
                     urlProps.setProperty(parameter, value);
                 }
             }
@@ -87,7 +87,7 @@ public abstract class AbstractDriver implements Driver {
             url = url.substring(0, indexOfColon);
         }
         // parse host
-        if (url != null && url.length() > 0 && url.trim().length() > 0) {
+        if (url.length() > 0 && url.trim().length() > 0) {
             urlProps.setProperty(TSDBDriver.PROPERTY_KEY_HOST, url);
         }
         return urlProps;
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractParameterMetaData.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractParameterMetaData.java
index cb6c7d40ad..7d9d8ee515 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractParameterMetaData.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractParameterMetaData.java
@@ -1,7 +1,5 @@
 package com.taosdata.jdbc;
 
-import com.sun.org.apache.xpath.internal.operations.Bool;
-
 import java.sql.ParameterMetaData;
 import java.sql.SQLException;
 import java.sql.Timestamp;
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/DatabaseMetaDataResultSet.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/DatabaseMetaDataResultSet.java
index cd266529f3..bda3d52212 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/DatabaseMetaDataResultSet.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/DatabaseMetaDataResultSet.java
@@ -15,10 +15,12 @@
 package com.taosdata.jdbc;
 
 import java.math.BigDecimal;
-import java.sql.*;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.Calendar;
-import java.util.Iterator;
 import java.util.List;
 
 /*
@@ -130,7 +132,7 @@ public class DatabaseMetaDataResultSet extends AbstractResultSet {
     public Timestamp getTimestamp(int columnIndex) throws SQLException {
         int colType = columnMetaDataList.get(columnIndex - 1).getColType();
         int nativeType = TSDBConstants.jdbcType2TaosType(colType);
-        return rowCursor.getTimestamp(columnIndex,nativeType);
+        return rowCursor.getTimestamp(columnIndex, nativeType);
     }
 
     @Override
@@ -145,9 +147,7 @@ public class DatabaseMetaDataResultSet extends AbstractResultSet {
 
     @Override
     public int findColumn(String columnLabel) throws SQLException {
-        Iterator<ColumnMetaData> colMetaDataIt = this.columnMetaDataList.iterator();
-        while (colMetaDataIt.hasNext()) {
-            ColumnMetaData colMetaData = colMetaDataIt.next();
+        for (ColumnMetaData colMetaData : this.columnMetaDataList) {
             if (colMetaData.getColName() != null && colMetaData.getColName().equals(columnLabel)) {
                 return colMetaData.getColIndex();
             }
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/EmptyResultSet.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/EmptyResultSet.java
index b6587b942d..64b4276e93 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/EmptyResultSet.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/EmptyResultSet.java
@@ -23,7 +23,7 @@ import java.util.Calendar;
 import java.util.Map;
 
 /*
- * TDengine only supports a subset of the standard SQL, thus this implemetation of the
+ * TDengine only supports a subset of the standard SQL, thus this implementation of the
  * standard JDBC API contains more or less some adjustments customized for certain
  * compatibility needs.
  */
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConnection.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConnection.java
index 02fee74eb5..8cd8da6de4 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConnection.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConnection.java
@@ -20,7 +20,7 @@ import java.util.Properties;
 public class TSDBConnection extends AbstractConnection {
 
     private TSDBJNIConnector connector;
-    private TSDBDatabaseMetaData databaseMetaData;
+    private final TSDBDatabaseMetaData databaseMetaData;
     private boolean batchFetch;
 
     public Boolean getBatchFetch() {
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java
index e6406d2c6d..5b5128e720 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConstants.java
@@ -54,10 +54,11 @@ public abstract class TSDBConstants {
     public static final int TSDB_DATA_TYPE_USMALLINT = 12;      //unsigned smallint
     public static final int TSDB_DATA_TYPE_UINT = 13;           //unsigned int
     public static final int TSDB_DATA_TYPE_UBIGINT = 14;        //unsigned bigint
+
     // nchar column max length
     public static final int maxFieldSize = 16 * 1024;
 
-    // precision for data types
+    // precision for data types, this is used for metadata
     public static final int BOOLEAN_PRECISION = 1;
     public static final int TINYINT_PRECISION = 4;
     public static final int SMALLINT_PRECISION = 6;
@@ -67,10 +68,12 @@ public abstract class TSDBConstants {
     public static final int DOUBLE_PRECISION = 22;
     public static final int TIMESTAMP_MS_PRECISION = 23;
     public static final int TIMESTAMP_US_PRECISION = 26;
-    // scale for data types
+    // scale for data types, this is used for metadata
     public static final int FLOAT_SCALE = 31;
     public static final int DOUBLE_SCALE = 31;
 
+    public static final String DEFAULT_PRECISION = "ms";
+
     public static int typeName2JdbcType(String type) {
         switch (type.toUpperCase()) {
             case "TIMESTAMP":
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDatabaseMetaData.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDatabaseMetaData.java
index 8b7ede148e..9a5eda4cd8 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDatabaseMetaData.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDatabaseMetaData.java
@@ -20,8 +20,8 @@ import java.sql.SQLException;
 
 public class TSDBDatabaseMetaData extends AbstractDatabaseMetaData {
 
-    private String url;
-    private String userName;
+    private final String url;
+    private final String userName;
     private Connection conn;
 
     public TSDBDatabaseMetaData(String url, String userName) {
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDriver.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDriver.java
index 55533bd28c..98a7d1929b 100755
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDriver.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDriver.java
@@ -176,7 +176,7 @@ public class TSDBDriver extends AbstractDriver {
         int beginningOfSlashes = url.indexOf("//");
         int index = url.indexOf("?");
         if (index != -1) {
-            String paramString = url.substring(index + 1, url.length());
+            String paramString = url.substring(index + 1);
             url = url.substring(0, index);
             StringTokenizer queryParams = new StringTokenizer(paramString, "&");
             while (queryParams.hasMoreElements()) {
@@ -213,7 +213,7 @@ public class TSDBDriver extends AbstractDriver {
             url = url.substring(0, indexOfColon);
         }
 
-        if (url != null && url.length() > 0 && url.trim().length() > 0) {
+        if (url.length() > 0 && url.trim().length() > 0) {
             urlProps.setProperty(TSDBDriver.PROPERTY_KEY_HOST, url);
         }
 
@@ -233,7 +233,7 @@ public class TSDBDriver extends AbstractDriver {
         return false;
     }
 
-    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
+    public Logger getParentLogger() {
         return null;
     }
 
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBError.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBError.java
index 411a61eb86..da89081428 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBError.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBError.java
@@ -8,7 +8,7 @@ import java.util.HashMap;
 import java.util.Map;
 
 public class TSDBError {
-    private static Map<Integer, String> TSDBErrorMap = new HashMap<>();
+    private static final Map<Integer, String> TSDBErrorMap = new HashMap<>();
 
     static {
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_CONNECTION_CLOSED, "connection already closed");
@@ -34,9 +34,8 @@ public class TSDBError {
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_UNKNOWN_TAOS_TYPE_IN_TDENGINE, "unknown taos type in tdengine");
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_UNKNOWN_TIMESTAMP_PERCISION, "unknown timestamp precision");
 
-        /**************************************************/
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_UNKNOWN, "unknown error");
-        /**************************************************/
+
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_SUBSCRIBE_FAILED, "failed to create subscription");
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_UNSUPPORTED_ENCODING, "Unsupported encoding");
         TSDBErrorMap.put(TSDBErrorNumbers.ERROR_JNI_TDENGINE_ERROR, "internal error of database");
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java
index 9f0ba5afab..714162b563 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBErrorNumbers.java
@@ -1,6 +1,7 @@
 package com.taosdata.jdbc;
 
 import java.util.HashSet;
+import java.util.Set;
 
 public class TSDBErrorNumbers {
 
@@ -39,10 +40,9 @@ public class TSDBErrorNumbers {
     public static final int ERROR_JNI_FETCH_END = 0x2358;       // fetch to the end of resultSet
     public static final int ERROR_JNI_OUT_OF_MEMORY = 0x2359;   // JNI alloc memory failed
 
-    private static final HashSet<Integer> errorNumbers;
+    private static final Set<Integer> errorNumbers = new HashSet();
 
     static {
-        errorNumbers = new HashSet();
         errorNumbers.add(ERROR_CONNECTION_CLOSED);
         errorNumbers.add(ERROR_UNSUPPORTED_METHOD);
         errorNumbers.add(ERROR_INVALID_VARIABLE);
@@ -65,7 +65,6 @@ public class TSDBErrorNumbers {
         errorNumbers.add(ERROR_UNKNOWN_TAOS_TYPE_IN_TDENGINE);
         errorNumbers.add(ERROR_UNKNOWN_TIMESTAMP_PERCISION);
 
-        /*****************************************************/
         errorNumbers.add(ERROR_SUBSCRIBE_FAILED);
         errorNumbers.add(ERROR_UNSUPPORTED_ENCODING);
         errorNumbers.add(ERROR_JNI_TDENGINE_ERROR);
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
index bc4d58785a..7f400fc1ee 100755
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
@@ -29,14 +29,9 @@ import java.util.List;
 public class TSDBJNIConnector {
     private static volatile Boolean isInitialized = false;
 
-    private TaosInfo taosInfo = TaosInfo.getInstance();
-
-    // Connection pointer used in C
-    private long taos = TSDBConstants.JNI_NULL_POINTER;
-
-    // result set status in current connection
-    private boolean isResultsetClosed;
-
+    private final TaosInfo taosInfo = TaosInfo.getInstance();
+    private long taos = TSDBConstants.JNI_NULL_POINTER;     // Connection pointer used in C
+    private boolean isResultsetClosed;      // result set status in current connection
     private int affectedRows = -1;
 
     static {
@@ -96,11 +91,9 @@ public class TSDBJNIConnector {
 
     /**
      * Execute DML/DDL operation
-     *
-     * @throws SQLException
      */
     public long executeQuery(String sql) throws SQLException {
-        Long pSql = 0l;
+        long pSql = 0L;
         try {
             pSql = this.executeQueryImp(sql.getBytes(TaosGlobalConfig.getCharset()), this.taos);
             taosInfo.stmt_count_increment();
@@ -161,7 +154,7 @@ public class TSDBJNIConnector {
     private native long getResultSetImp(long connection, long pSql);
 
     public boolean isUpdateQuery(long pSql) {
-        return isUpdateQueryImp(this.taos, pSql) == 1 ? true : false;
+        return isUpdateQueryImp(this.taos, pSql) == 1;
     }
 
     private native long isUpdateQueryImp(long connection, long pSql);
@@ -195,7 +188,7 @@ public class TSDBJNIConnector {
      */
     public int getSchemaMetaData(long resultSet, List<ColumnMetaData> columnMetaData) {
         int ret = this.getSchemaMetaDataImp(this.taos, resultSet, columnMetaData);
-        columnMetaData.stream().forEach(column -> column.setColIndex(column.getColIndex() + 1));
+        columnMetaData.forEach(column -> column.setColIndex(column.getColIndex() + 1));
         return ret;
     }
 
@@ -218,8 +211,9 @@ public class TSDBJNIConnector {
 
     /**
      * Get Result Time Precision.
+     *
      * @return 0: ms, 1: us, 2: ns
-    */
+     */
     public int getResultTimePrecision(long sqlObj) {
         return this.getResultTimePrecisionImp(this.taos, sqlObj);
     }
@@ -228,8 +222,6 @@ public class TSDBJNIConnector {
 
     /**
      * Execute close operation from C to release connection pointer by JNI
-     *
-     * @throws SQLException
      */
     public void closeConnection() throws SQLException {
         int code = this.closeConnectionImp(this.taos);
@@ -268,8 +260,6 @@ public class TSDBJNIConnector {
 
     /**
      * Unsubscribe, close a subscription
-     *
-     * @param subscription
      */
     void unsubscribe(long subscription, boolean isKeep) {
         unsubscribeImp(subscription, isKeep);
@@ -282,13 +272,13 @@ public class TSDBJNIConnector {
      */
     public boolean validateCreateTableSql(String sql) {
         int res = validateCreateTableSqlImp(taos, sql.getBytes());
-        return res != 0 ? false : true;
+        return res == 0;
     }
 
     private native int validateCreateTableSqlImp(long connection, byte[] sqlBytes);
 
     public long prepareStmt(String sql) throws SQLException {
-        Long stmt;
+        long stmt;
         try {
             stmt = prepareStmtImp(sql.getBytes(), this.taos);
         } catch (Exception e) {
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBPreparedStatement.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBPreparedStatement.java
index 1a007156e9..d9042fb729 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBPreparedStatement.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBPreparedStatement.java
@@ -62,8 +62,8 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
 
         if (parameterCnt > 1) {
             // the table name is also a parameter, so ignore it.
-            this.colData = new ArrayList<ColumnInfo>();
-            this.tableTags = new ArrayList<TableTagInfo>();
+            this.colData = new ArrayList<>();
+            this.tableTags = new ArrayList<>();
         }
     }
 
@@ -73,12 +73,16 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
     }
 
     /*
+     *
+     */
+
+    /**
      * Some of the SQLs sent by other popular frameworks or tools like Spark, contains syntax that cannot be parsed by
      * the TDengine client. Thus, some simple parsers/filters are intentionally added in this JDBC implementation in
      * order to process those supported SQLs.
      */
     private void preprocessSql() {
-        /***** For processing some of Spark SQLs*****/
+        /***For processing some of Spark SQLs*/
         // should replace it first
         this.rawSql = this.rawSql.replaceAll("or (.*) is null", "");
         this.rawSql = this.rawSql.replaceAll(" where ", " WHERE ");
@@ -125,7 +129,6 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
             }
             rawSql = rawSql.replace(matcher.group(1), tableFullName);
         }
-        /***** for inner queries *****/
     }
 
     @Override
@@ -519,12 +522,10 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
         }
     }
 
-    ;
-
     private static class TableTagInfo {
         private boolean isNull;
-        private Object value;
-        private int type;
+        private final Object value;
+        private final int type;
 
         public TableTagInfo(Object value, int type) {
             this.value = value;
@@ -538,8 +539,6 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
         }
     }
 
-    ;
-
     public void setTableName(String name) {
         this.tableName = name;
     }
@@ -627,7 +626,7 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
             this.colData.addAll(Collections.nCopies(this.parameters.length - 1 - this.tableTags.size(), null));
         }
 
-        ColumnInfo col = (ColumnInfo) this.colData.get(columnIndex);
+        ColumnInfo col = this.colData.get(columnIndex);
         if (col == null) {
             ColumnInfo p = new ColumnInfo();
             p.setType(type);
@@ -718,8 +717,7 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
             ByteBuffer isNullList = ByteBuffer.allocate(num * Integer.BYTES);
             isNullList.order(ByteOrder.LITTLE_ENDIAN);
 
-            for (int i = 0; i < num; ++i) {
-                TableTagInfo tag = this.tableTags.get(i);
+            for (TableTagInfo tag : this.tableTags) {
                 if (tag.isNull) {
                     typeList.put((byte) tag.type);
                     isNullList.putInt(1);
@@ -818,7 +816,7 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
                     typeList, lengthList, isNullList);
         }
 
-        ColumnInfo colInfo = (ColumnInfo) this.colData.get(0);
+        ColumnInfo colInfo = this.colData.get(0);
         if (colInfo == null) {
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNKNOWN, "column data not bind");
         }
@@ -954,7 +952,6 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
                     throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNKNOWN, "not support data types");
                 }
             }
-            ;
 
             connector.bindColumnDataArray(this.nativeStmtHandle, colDataList, lengthList, isNullList, col1.type, col1.bytes, rows, i);
         }
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSet.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSet.java
index 59a64ad520..00a62206fc 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSet.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSet.java
@@ -339,11 +339,11 @@ public class TSDBResultSet extends AbstractResultSet implements ResultSet {
                 case TSDBConstants.TSDB_DATA_TYPE_SMALLINT:
                 case TSDBConstants.TSDB_DATA_TYPE_INT:
                 case TSDBConstants.TSDB_DATA_TYPE_BIGINT:
-                    res = new BigDecimal(Long.valueOf(this.rowData.getObject(columnIndex).toString()));
+                    res = new BigDecimal(Long.parseLong(this.rowData.getObject(columnIndex).toString()));
                     break;
                 case TSDBConstants.TSDB_DATA_TYPE_FLOAT:
                 case TSDBConstants.TSDB_DATA_TYPE_DOUBLE:
-                    res = new BigDecimal(Double.valueOf(this.rowData.getObject(columnIndex).toString()));
+                    res = BigDecimal.valueOf(Double.parseDouble(this.rowData.getObject(columnIndex).toString()));
                     break;
                 case TSDBConstants.TSDB_DATA_TYPE_TIMESTAMP:
                     return new BigDecimal(((Timestamp) this.rowData.getObject(columnIndex)).getTime());
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetBlockData.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetBlockData.java
index 7b3be5d263..6211f61dc5 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetBlockData.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetBlockData.java
@@ -36,23 +36,20 @@ public class TSDBResultSetBlockData {
     private int rowIndex = 0;
 
     private List<ColumnMetaData> columnMetaDataList;
-    private ArrayList<Object> colData = null;
+    private ArrayList<Object> colData;
 
     public TSDBResultSetBlockData(List<ColumnMetaData> colMeta, int numOfCols) {
         this.columnMetaDataList = colMeta;
-        this.colData = new ArrayList<Object>(numOfCols);
+        this.colData = new ArrayList<>(numOfCols);
     }
 
     public TSDBResultSetBlockData() {
-        this.colData = new ArrayList<Object>();
+        this.colData = new ArrayList<>();
     }
 
     public void clear() {
         int size = this.colData.size();
-        if (this.colData != null) {
-            this.colData.clear();
-        }
-
+        this.colData.clear();
         setNumOfCols(size);
     }
 
@@ -69,7 +66,7 @@ public class TSDBResultSetBlockData {
     }
 
     public void setNumOfCols(int numOfCols) {
-        this.colData = new ArrayList<Object>(numOfCols);
+        this.colData = new ArrayList<>(numOfCols);
         this.colData.addAll(Collections.nCopies(numOfCols, null));
     }
 
@@ -166,15 +163,10 @@ public class TSDBResultSetBlockData {
         }
     }
 
-    
 
     /**
      * The original type may not be a string type, but will be converted to by
      * calling this method
-     *
-     * @param col column index
-     * @return
-     * @throws SQLException
      */
     public String getString(int col) throws SQLException {
         Object obj = get(col);
@@ -387,7 +379,7 @@ public class TSDBResultSetBlockData {
                     return null;
                 }
 
-                return (long) val;
+                return val;
             }
 
             case TSDBConstants.TSDB_DATA_TYPE_FLOAT: {
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetMetaData.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetMetaData.java
index 48d4247392..6292673352 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetMetaData.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetMetaData.java
@@ -41,10 +41,7 @@ public class TSDBResultSetMetaData extends WrapperImpl implements ResultSetMetaD
     }
 
     public boolean isSearchable(int column) throws SQLException {
-        if (column == 1) {
-            return true;
-        }
-        return false;
+        return column == 1;
     }
 
     public boolean isCurrency(int column) throws SQLException {
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetRowData.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetRowData.java
index e00ec1e758..b91fe88dfa 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetRowData.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetRowData.java
@@ -19,14 +19,13 @@ import com.taosdata.jdbc.utils.NullType;
 import java.math.BigDecimal;
 import java.sql.SQLException;
 import java.sql.Timestamp;
-import java.time.Instant;
 import java.util.ArrayList;
 import java.util.Collections;
 
 public class TSDBResultSetRowData {
 
     private ArrayList<Object> data;
-    private int colSize;
+    private final int colSize;
 
     public TSDBResultSetRowData(int colSize) {
         this.colSize = colSize;
@@ -390,27 +389,27 @@ public class TSDBResultSetRowData {
 
         switch (nativeType) {
             case TSDBConstants.TSDB_DATA_TYPE_UTINYINT: {
-                Byte value = new Byte(String.valueOf(obj));
+                byte value = new Byte(String.valueOf(obj));
                 if (value >= 0)
-                    return value.toString();
+                    return Byte.toString(value);
                 return Integer.toString(value & 0xff);
             }
             case TSDBConstants.TSDB_DATA_TYPE_USMALLINT: {
-                Short value = new Short(String.valueOf(obj));
+                short value = new Short(String.valueOf(obj));
                 if (value >= 0)
-                    return value.toString();
+                    return Short.toString(value);
                 return Integer.toString(value & 0xffff);
             }
             case TSDBConstants.TSDB_DATA_TYPE_UINT: {
-                Integer value = new Integer(String.valueOf(obj));
+                int value = new Integer(String.valueOf(obj));
                 if (value >= 0)
-                    return value.toString();
-                return Long.toString(value & 0xffffffffl);
+                    return Integer.toString(value);
+                return Long.toString(value & 0xffffffffL);
             }
             case TSDBConstants.TSDB_DATA_TYPE_UBIGINT: {
-                Long value = new Long(String.valueOf(obj));
+                long value = new Long(String.valueOf(obj));
                 if (value >= 0)
-                    return value.toString();
+                    return Long.toString(value);
                 long lowValue = value & 0x7fffffffffffffffL;
                 return BigDecimal.valueOf(lowValue).add(BigDecimal.valueOf(Long.MAX_VALUE)).add(BigDecimal.valueOf(1)).toString();
             }
@@ -432,25 +431,26 @@ public class TSDBResultSetRowData {
 
     /**
      * !!! this method is invoked by JNI method and the index start from 0 in C implementations
+     *
      * @param precision 0 : ms, 1 : us, 2 : ns
      */
     public void setTimestamp(int col, long ts, int precision) {
-        long milliseconds = 0;
-        int fracNanoseconds = 0;
+        long milliseconds;
+        int fracNanoseconds;
         switch (precision) {
             case 0: {
                 milliseconds = ts;
-                fracNanoseconds = (int)(ts*1_000_000%1_000_000_000);
+                fracNanoseconds = (int) (ts * 1_000_000 % 1_000_000_000);
                 break;
             }
             case 1: {
-                milliseconds = ts/1_000;
-                fracNanoseconds = (int)(ts*1_000%1_000_000_000);
+                milliseconds = ts / 1_000;
+                fracNanoseconds = (int) (ts * 1_000 % 1_000_000_000);
                 break;
             }
             case 2: {
-                milliseconds = ts/1_000_000;
-                fracNanoseconds = (int)(ts%1_000_000_000);
+                milliseconds = ts / 1_000_000;
+                fracNanoseconds = (int) (ts % 1_000_000_000);
                 break;
             }
             default: {
@@ -467,12 +467,10 @@ public class TSDBResultSetRowData {
         Object obj = data.get(col - 1);
         if (obj == null)
             return null;
-        switch (nativeType) {
-            case TSDBConstants.TSDB_DATA_TYPE_BIGINT:
-                return new Timestamp((Long) obj);
-            default:
-                return (Timestamp) obj;
+        if (nativeType == TSDBConstants.TSDB_DATA_TYPE_BIGINT) {
+            return new Timestamp((Long) obj);
         }
+        return (Timestamp) obj;
     }
 
     public Object getObject(int col) {
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBSubscribe.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBSubscribe.java
index c5fd497ca3..d74f7755b2 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBSubscribe.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBSubscribe.java
@@ -47,9 +47,6 @@ public class TSDBSubscribe {
 
     /**
      * close subscription
-     *
-     * @param keepProgress
-     * @throws SQLException
      */
     public void close(boolean keepProgress) throws SQLException {
         if (this.connecter.isClosed())
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/enums/TimestampFormat.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/enums/TimestampFormat.java
similarity index 65%
rename from src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/enums/TimestampFormat.java
rename to src/connector/jdbc/src/main/java/com/taosdata/jdbc/enums/TimestampFormat.java
index edc429857e..5ff0774639 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/enums/TimestampFormat.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/enums/TimestampFormat.java
@@ -1,4 +1,4 @@
-package com.taosdata.jdbc.rs.enums;
+package com.taosdata.jdbc.enums;
 
 public enum TimestampFormat {
     STRING,
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulConnection.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulConnection.java
index d6a02b7e3a..12a0ab57e2 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulConnection.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulConnection.java
@@ -16,7 +16,7 @@ public class RestfulConnection extends AbstractConnection {
     private final String host;
     private final int port;
     private final String url;
-    private volatile String database;
+    private final String database;
     private final String token;
     /******************************************************/
     private boolean isClosed;
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulPreparedStatement.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulPreparedStatement.java
index 16272f4289..1eaddce1d6 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulPreparedStatement.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulPreparedStatement.java
@@ -13,7 +13,7 @@ import java.util.Calendar;
 
 public class RestfulPreparedStatement extends RestfulStatement implements PreparedStatement {
 
-    private ParameterMetaData parameterMetaData;
+    private final ParameterMetaData parameterMetaData;
     private final String rawSql;
     private Object[] parameters;
     private boolean isPrepared;
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java
index 13850f0b80..d435062ef6 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSet.java
@@ -7,7 +7,7 @@ import com.google.common.primitives.Longs;
 import com.google.common.primitives.Shorts;
 import com.taosdata.jdbc.*;
 import com.taosdata.jdbc.enums.TimestampPrecision;
-import com.taosdata.jdbc.rs.enums.TimestampFormat;
+import com.taosdata.jdbc.enums.TimestampFormat;
 import com.taosdata.jdbc.utils.Utils;
 
 import java.math.BigDecimal;
@@ -17,19 +17,20 @@ import java.time.ZoneOffset;
 import java.time.format.DateTimeParseException;
 import java.util.ArrayList;
 import java.util.Calendar;
+import java.util.List;
 
 public class RestfulResultSet extends AbstractResultSet implements ResultSet {
-    private volatile boolean isClosed;
-    private int pos = -1;
 
-    private final String database;
     private final Statement statement;
     // data
-    private final ArrayList<ArrayList<Object>> resultSet = new ArrayList<>();
+    private final List<List<Object>> resultSet = new ArrayList<>();
     // meta
-    private ArrayList<String> columnNames = new ArrayList<>();
-    private ArrayList<Field> columns = new ArrayList<>();
-    private RestfulResultSetMetaData metaData;
+    private final List<String> columnNames = new ArrayList<>();
+    private final List<Field> columns = new ArrayList<>();
+    private final RestfulResultSetMetaData metaData;
+
+    private volatile boolean isClosed;
+    private int pos = -1;
 
     /**
      * 由一个result的Json构造结果集，对应执行show databases, show tables等这些语句，返回结果集，但无法获取结果集对应的meta，统一当成String处理
@@ -37,35 +38,30 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
      * @param resultJson: 包含data信息的结果集，有sql返回的结果集
      ***/
     public RestfulResultSet(String database, Statement statement, JSONObject resultJson) throws SQLException {
-        this.database = database;
         this.statement = statement;
 
+        // get head
+        JSONArray head = resultJson.getJSONArray("head");
         // get column metadata
         JSONArray columnMeta = resultJson.getJSONArray("column_meta");
         // get row data
         JSONArray data = resultJson.getJSONArray("data");
-        if (data == null || data.isEmpty()) {
-            columnNames.clear();
-            columns.clear();
-            this.resultSet.clear();
-            this.metaData = new RestfulResultSetMetaData(this.database, null, this);
-            return;
-        }
-        // get head
-        JSONArray head = resultJson.getJSONArray("head");
         // get rows
         Integer rows = resultJson.getInteger("rows");
+
         // parse column_meta
         if (columnMeta != null) {
             parseColumnMeta_new(columnMeta);
         } else {
             parseColumnMeta_old(head, data, rows);
         }
-        this.metaData = new RestfulResultSetMetaData(this.database, columns, this);
+        this.metaData = new RestfulResultSetMetaData(database, columns, this);
+
+        if (data == null || data.isEmpty())
+            return;
         // parse row data
-        resultSet.clear();
         for (int rowIndex = 0; rowIndex < data.size(); rowIndex++) {
-            ArrayList row = new ArrayList();
+            List<Object> row = new ArrayList();
             JSONArray jsonRow = data.getJSONArray(rowIndex);
             for (int colIndex = 0; colIndex < this.metaData.getColumnCount(); colIndex++) {
                 row.add(parseColumnData(jsonRow, colIndex, columns.get(colIndex).taos_type));
@@ -174,8 +170,8 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
                 //TODO: this implementation has bug if the timestamp bigger than 9999_9999_9999_9
                 if (value < 1_0000_0000_0000_0L)
                     return new Timestamp(value);
-                long epochSec = value / 1000_000l;
-                long nanoAdjustment = value % 1000_000l * 1000l;
+                long epochSec = value / 1000_000L;
+                long nanoAdjustment = value % 1000_000L * 1000L;
                 return Timestamp.from(Instant.ofEpochSecond(epochSec, nanoAdjustment));
             }
             case UTC: {
@@ -244,10 +240,7 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
         if (isClosed())
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_RESULTSET_CLOSED);
         pos++;
-        if (pos <= resultSet.size() - 1) {
-            return true;
-        }
-        return false;
+        return pos <= resultSet.size() - 1;
     }
 
     @Override
@@ -257,13 +250,6 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
         }
     }
 
-//    @Override
-//    public boolean wasNull() throws SQLException {
-//        if (isClosed())
-//            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_RESULTSET_CLOSED);
-//        return resultSet.isEmpty();
-//    }
-
     @Override
     public String getString(int columnIndex) throws SQLException {
         checkAvailability(columnIndex, resultSet.get(pos).size());
@@ -288,7 +274,7 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
         wasNull = false;
         if (value instanceof Boolean)
             return (boolean) value;
-        return Boolean.valueOf(value.toString());
+        return Boolean.parseBoolean(value.toString());
     }
 
     @Override
@@ -443,9 +429,7 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             return null;
         if (value instanceof Timestamp)
             return new Date(((Timestamp) value).getTime());
-        Date date = null;
-        date = Utils.parseDate(value.toString());
-        return date;
+        return Utils.parseDate(value.toString());
     }
 
     @Override
@@ -460,8 +444,7 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
         Time time = null;
         try {
             time = Utils.parseTime(value.toString());
-        } catch (DateTimeParseException e) {
-            time = null;
+        } catch (DateTimeParseException ignored) {
         }
         return time;
     }
@@ -525,9 +508,9 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
             return null;
 
         if (value instanceof Long || value instanceof Integer || value instanceof Short || value instanceof Byte)
-            return new BigDecimal(Long.valueOf(value.toString()));
+            return new BigDecimal(Long.parseLong(value.toString()));
         if (value instanceof Double || value instanceof Float)
-            return new BigDecimal(Double.valueOf(value.toString()));
+            return BigDecimal.valueOf(Double.parseDouble(value.toString()));
         if (value instanceof Timestamp)
             return new BigDecimal(((Timestamp) value).getTime());
         BigDecimal ret;
@@ -637,36 +620,6 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
         if (isClosed())
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_RESULTSET_CLOSED);
 
-//        if (this.resultSet.size() == 0)
-//            return false;
-//
-//        if (row == 0) {
-//            beforeFirst();
-//            return false;
-//        } else if (row == 1) {
-//            return first();
-//        } else if (row == -1) {
-//            return last();
-//        } else if (row > this.resultSet.size()) {
-//            afterLast();
-//            return false;
-//        } else {
-//            if (row < 0) {
-//                // adjust to reflect after end of result set
-//                int newRowPosition = this.resultSet.size() + row + 1;
-//                if (newRowPosition <= 0) {
-//                    beforeFirst();
-//                    return false;
-//                } else {
-//                    return absolute(newRowPosition);
-//                }
-//            } else {
-//                row--; // adjust for index difference
-//                this.pos = row;
-//                return true;
-//            }
-//        }
-
         throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_UNSUPPORTED_METHOD);
     }
 
@@ -710,5 +663,4 @@ public class RestfulResultSet extends AbstractResultSet implements ResultSet {
         return isClosed;
     }
 
-
-}
+}
\ No newline at end of file
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSetMetaData.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSetMetaData.java
index a185abb709..148f77974f 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSetMetaData.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulResultSetMetaData.java
@@ -7,20 +7,17 @@ import java.sql.ResultSetMetaData;
 import java.sql.SQLException;
 import java.sql.Timestamp;
 import java.sql.Types;
-import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
 public class RestfulResultSetMetaData extends WrapperImpl implements ResultSetMetaData {
 
     private final String database;
-    private List<RestfulResultSet.Field> fields;
-    private final RestfulResultSet resultSet;
+    private final List<RestfulResultSet.Field> fields;
 
-    public RestfulResultSetMetaData(String database, ArrayList<RestfulResultSet.Field> fields, RestfulResultSet resultSet) {
+    public RestfulResultSetMetaData(String database, List<RestfulResultSet.Field> fields, RestfulResultSet resultSet) {
         this.database = database;
         this.fields = fields == null ? Collections.emptyList() : fields;
-        this.resultSet = resultSet;
     }
 
     public List<RestfulResultSet.Field> getFields() {
@@ -141,8 +138,8 @@ public class RestfulResultSetMetaData extends WrapperImpl implements ResultSetMe
 
     @Override
     public String getColumnTypeName(int column) throws SQLException {
-        int taos_type = fields.get(column - 1).taos_type;
-        return TSDBConstants.taosType2JdbcTypeName(taos_type);
+        int taosType = fields.get(column - 1).taos_type;
+        return TSDBConstants.taosType2JdbcTypeName(taosType);
     }
 
     @Override
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulStatement.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulStatement.java
index e9d193f6b4..f8acd8f061 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulStatement.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulStatement.java
@@ -35,10 +35,6 @@ public class RestfulStatement extends AbstractStatement {
         if (!SqlSyntaxValidator.isValidForExecuteQuery(sql))
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE_QUERY, "not a valid sql for executeQuery: " + sql);
 
-        if (SqlSyntaxValidator.isDatabaseUnspecifiedQuery(sql)) {
-            return executeOneQuery(sql);
-        }
-
         return executeOneQuery(sql);
     }
 
@@ -50,9 +46,6 @@ public class RestfulStatement extends AbstractStatement {
             throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_INVALID_FOR_EXECUTE_UPDATE, "not a valid sql for executeUpdate: " + sql);
 
         final String url = "http://" + conn.getHost() + ":" + conn.getPort() + "/rest/sql";
-        if (SqlSyntaxValidator.isDatabaseUnspecifiedUpdate(sql)) {
-            return executeOneUpdate(url, sql);
-        }
 
         return executeOneUpdate(url, sql);
     }
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/HttpClientPoolUtil.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/HttpClientPoolUtil.java
index ff27bdbdad..715b051b74 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/HttpClientPoolUtil.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/HttpClientPoolUtil.java
@@ -27,19 +27,18 @@ public class HttpClientPoolUtil {
     private static final int DEFAULT_MAX_TOTAL = 1000;
     private static final int DEFAULT_HTTP_KEEP_TIME = 15000;
 
-    private static PoolingHttpClientConnectionManager connectionManager;
     private static CloseableHttpClient httpClient;
 
     private static synchronized void initPools() {
         if (httpClient == null) {
-            connectionManager = new PoolingHttpClientConnectionManager();
+            PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
             connectionManager.setDefaultMaxPerRoute(DEFAULT_MAX_PER_ROUTE);
             connectionManager.setMaxTotal(DEFAULT_MAX_TOTAL);
             httpClient = HttpClients.custom().setKeepAliveStrategy(DEFAULT_KEEP_ALIVE_STRATEGY).setConnectionManager(connectionManager).build();
         }
     }
 
-    private static ConnectionKeepAliveStrategy DEFAULT_KEEP_ALIVE_STRATEGY = (response, context) -> {
+    private static final ConnectionKeepAliveStrategy DEFAULT_KEEP_ALIVE_STRATEGY = (response, context) -> {
         HeaderElementIterator it = new BasicHeaderElementIterator(response.headerIterator(HTTP.CONN_KEEP_ALIVE));
         int keepTime = DEFAULT_HTTP_KEEP_TIME * 1000;
         while (it.hasNext()) {
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/SqlSyntaxValidator.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/SqlSyntaxValidator.java
index 251ca2af01..15faa41a27 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/SqlSyntaxValidator.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/SqlSyntaxValidator.java
@@ -14,10 +14,6 @@
  *****************************************************************************/
 package com.taosdata.jdbc.utils;
 
-import com.taosdata.jdbc.TSDBConnection;
-
-import java.sql.Connection;
-
 public class SqlSyntaxValidator {
 
     private static final String[] SQL = {"select", "insert", "import", "create", "use", "alter", "drop", "set", "show", "describe"};
@@ -26,12 +22,6 @@ public class SqlSyntaxValidator {
 
     private static final String[] databaseUnspecifiedShow = {"databases", "dnodes", "mnodes", "variables"};
 
-    private TSDBConnection tsdbConnection;
-
-    public SqlSyntaxValidator(Connection connection) {
-        this.tsdbConnection = (TSDBConnection) connection;
-    }
-
     public static boolean isValidForExecuteUpdate(String sql) {
         for (String prefix : updateSQL) {
             if (sql.trim().toLowerCase().startsWith(prefix))
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/Utils.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/Utils.java
index 4c92d27a28..e3179bd317 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/Utils.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/utils/Utils.java
@@ -6,6 +6,7 @@ import com.google.common.collect.TreeRangeSet;
 import com.taosdata.jdbc.enums.TimestampPrecision;
 
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.sql.Date;
 import java.sql.Time;
 import java.sql.Timestamp;
@@ -160,7 +161,7 @@ public class Utils {
             String paraStr;
             if (para != null) {
                 if (para instanceof byte[]) {
-                    paraStr = new String((byte[]) para, Charset.forName("UTF-8"));
+                    paraStr = new String((byte[]) para, StandardCharsets.UTF_8);
                 } else {
                     paraStr = para.toString();
                 }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/StatementTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/StatementTest.java
deleted file mode 100644
index 73ceafa729..0000000000
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/StatementTest.java
+++ /dev/null
@@ -1,108 +0,0 @@
-package com.taosdata.jdbc;
-
-import org.junit.AfterClass;
-import org.junit.Assert;
-import org.junit.BeforeClass;
-import org.junit.Test;
-
-import java.sql.*;
-import java.util.Properties;
-
-public class StatementTest {
-    static Connection connection = null;
-    static Statement statement = null;
-    static String dbName = "test";
-    static String tName = "t0";
-    static String host = "localhost";
-
-    @BeforeClass
-    public static void createConnection() throws SQLException {
-        try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
-            Properties properties = new Properties();
-            properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
-            properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
-            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
-            connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/?user=root&password=taosdata", properties);
-            statement = connection.createStatement();
-            statement.executeUpdate("drop database if exists " + dbName);
-
-        } catch (ClassNotFoundException e) {
-            return;
-        }
-    }
-
-    @Test
-    public void testCase() {
-        try {
-            ResultSet rs = statement.executeQuery("show databases");
-            ResultSetMetaData metaData = rs.getMetaData();
-            while (rs.next()) {
-                for (int i = 1; i <= metaData.getColumnCount(); i++) {
-                    System.out.print(metaData.getColumnLabel(i) + ":" + rs.getString(i) + "\t");
-                }
-                System.out.println();
-            }
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    @Test
-    public void createTableAndQuery() throws SQLException {
-        long ts = System.currentTimeMillis();
-
-        statement.executeUpdate("create database if not exists " + dbName);
-        statement.executeUpdate("create table if not exists " + dbName + "." + tName + "(ts timestamp, k1 int)");
-        statement.executeUpdate("insert into " + dbName + "." + tName + " values (" + ts + ", 1)");
-        statement.execute("select * from " + dbName + "." + tName);
-        ResultSet resultSet = statement.getResultSet();
-        Assert.assertNotNull(resultSet);
-
-        boolean isClosed = statement.isClosed();
-        Assert.assertEquals(false, isClosed);
-    }
-
-    @Test(expected = SQLException.class)
-    public void testUnsupport() throws SQLException {
-        Assert.assertNotNull(statement.unwrap(TSDBStatement.class));
-        Assert.assertTrue(statement.isWrapperFor(TSDBStatement.class));
-
-        statement.getMaxFieldSize();
-        statement.setMaxFieldSize(0);
-        statement.setEscapeProcessing(true);
-        statement.cancel();
-        statement.getWarnings();
-        statement.clearWarnings();
-        statement.setCursorName(null);
-        statement.getMoreResults();
-        statement.setFetchDirection(0);
-        statement.getFetchDirection();
-        statement.getResultSetConcurrency();
-        statement.getResultSetType();
-        statement.getConnection();
-        statement.getMoreResults();
-        statement.getGeneratedKeys();
-        statement.executeUpdate(null, 0);
-        statement.executeUpdate(null, new int[]{0});
-        statement.executeUpdate(null, new String[]{"str1", "str2"});
-        statement.getResultSetHoldability();
-        statement.setPoolable(true);
-        statement.isPoolable();
-        statement.closeOnCompletion();
-        statement.isCloseOnCompletion();
-    }
-
-    @AfterClass
-    public static void close() {
-        try {
-            statement.execute("drop database if exists " + dbName);
-            if (statement != null)
-                statement.close();
-            if (connection != null)
-                connection.close();
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-}
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBConnectionTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBConnectionTest.java
index dc6d0d322a..30c6d99a40 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBConnectionTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBConnectionTest.java
@@ -380,14 +380,15 @@ public class TSDBConnectionTest {
         conn.abort(null);
     }
 
-    @Test(expected = SQLFeatureNotSupportedException.class)
+    @Test
     public void setNetworkTimeout() throws SQLException {
         conn.setNetworkTimeout(null, 1000);
     }
 
-    @Test(expected = SQLFeatureNotSupportedException.class)
+    @Test
     public void getNetworkTimeout() throws SQLException {
-        conn.getNetworkTimeout();
+        int networkTimeout = conn.getNetworkTimeout();
+        Assert.assertEquals(0, networkTimeout);
     }
 
     @Test
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBStatementTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBStatementTest.java
index 51535bc886..c1dfa42511 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBStatementTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/TSDBStatementTest.java
@@ -14,24 +14,6 @@ public class TSDBStatementTest {
     private static Connection conn;
     private static Statement stmt;
 
-    @Test
-    public void executeQuery() {
-        try {
-            ResultSet rs = stmt.executeQuery("show databases");
-            Assert.assertNotNull(rs);
-            ResultSetMetaData meta = rs.getMetaData();
-            while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-                }
-                System.out.println();
-            }
-            rs.close();
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
     @Test
     public void executeUpdate() {
         final String dbName = ("test_" + UUID.randomUUID()).replace("-", "_").substring(0, 32);
@@ -173,10 +155,6 @@ public class TSDBStatementTest {
             Assert.assertEquals(3, meta.getColumnCount());
             int count = 0;
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-                }
-                System.out.println();
                 count++;
             }
             Assert.assertEquals(1, count);
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java
index 19bc5f713f..4f37183e71 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AppMemoryLeakTest.java
@@ -1,5 +1,6 @@
 package com.taosdata.jdbc.cases;
 
+import org.junit.Assert;
 import org.junit.Test;
 
 import java.sql.Connection;
@@ -12,21 +13,19 @@ public class AppMemoryLeakTest {
     @Test(expected = SQLException.class)
     public void testCreateTooManyConnection() throws ClassNotFoundException, SQLException {
         Class.forName("com.taosdata.jdbc.TSDBDriver");
-        int conCnt = 0;
         while (true) {
             Connection conn = DriverManager.getConnection("jdbc:TAOS://localhost:6030/?user=root&password=taosdata");
-            System.out.println(conCnt++ + " : " + conn);
+            Assert.assertNotNull(conn);
         }
     }
 
     @Test(expected = Exception.class)
     public void testCreateTooManyStatement() throws ClassNotFoundException, SQLException {
         Class.forName("com.taosdata.jdbc.TSDBDriver");
-        int stmtCnt = 0;
         Connection conn = DriverManager.getConnection("jdbc:TAOS://localhost:6030/?user=root&password=taosdata");
         while (true) {
             Statement stmt = conn.createStatement();
-            System.out.println(++stmtCnt + " : " + stmt);
+            Assert.assertNotNull(stmt);
         }
     }
 
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/AuthenticationTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AuthenticationTest.java
similarity index 98%
rename from src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/AuthenticationTest.java
rename to src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AuthenticationTest.java
index a6fb6cfda0..6702de9bdb 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/AuthenticationTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/AuthenticationTest.java
@@ -1,4 +1,4 @@
-package com.taosdata.jdbc.rs;
+package com.taosdata.jdbc.cases;
 
 import org.junit.Before;
 import org.junit.Test;
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/BatchInsertTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/BatchInsertTest.java
index e2541e8109..e175d6d114 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/BatchInsertTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/BatchInsertTest.java
@@ -60,7 +60,6 @@ public class BatchInsertTest {
             final int index = i;
             executorService.execute(() -> {
                 try {
-                    long startTime = System.currentTimeMillis();
                     Statement statement = connection.createStatement(); // get statement
                     StringBuilder sb = new StringBuilder();
                     sb.append("INSERT INTO " + tablePrefix + index + " VALUES");
@@ -73,8 +72,6 @@ public class BatchInsertTest {
                     }
                     statement.addBatch(sb.toString());
                     statement.executeBatch();
-                    long endTime = System.currentTimeMillis();
-                    System.out.println("Thread " + index + " takes " + (endTime - startTime) + " microseconds");
                     connection.commit();
                     statement.close();
                 } catch (Exception e) {
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ConnectMultiTaosdByRestfulWithDifferentTokenTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ConnectMultiTaosdByRestfulWithDifferentTokenTest.java
index 7f2d367dce..31893527af 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ConnectMultiTaosdByRestfulWithDifferentTokenTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ConnectMultiTaosdByRestfulWithDifferentTokenTest.java
@@ -31,9 +31,6 @@ public class ConnectMultiTaosdByRestfulWithDifferentTokenTest {
             ResultSet rs = stmt.executeQuery("select server_status()");
             ResultSetMetaData meta = rs.getMetaData();
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.println(meta.getColumnLabel(i) + ": " + rs.getString(i));
-                }
             }
         } catch (SQLException e) {
             e.printStackTrace();
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/DatetimeBefore1970Test.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/DatetimeBefore1970Test.java
index f97e555ad1..14c7698548 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/DatetimeBefore1970Test.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/DatetimeBefore1970Test.java
@@ -1,64 +1,76 @@
 package com.taosdata.jdbc.cases;
 
 import com.taosdata.jdbc.utils.TimestampUtil;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.*;
 
 import java.sql.*;
 
 public class DatetimeBefore1970Test {
 
-    private static Connection conn;
+    private static final String host = "127.0.0.1";
+    private Connection conn;
 
     @Test
     public void test() {
         try (Statement stmt = conn.createStatement()) {
+            // given
             stmt.executeUpdate("insert into weather(ts) values('1969-12-31 23:59:59.999')");
             stmt.executeUpdate("insert into weather(ts) values('1970-01-01 00:00:00.000')");
             stmt.executeUpdate("insert into weather(ts) values('1970-01-01 08:00:00.000')");
             stmt.executeUpdate("insert into weather(ts) values('1970-01-01 07:59:59.999')");
+            ResultSet rs = stmt.executeQuery("select * from weather order by ts asc");
+            ResultSetMetaData metaData = rs.getMetaData();
+            Assert.assertEquals(2, metaData.getColumnCount());
+
+            // when
+            rs.next();
+            // then
+            Timestamp ts = rs.getTimestamp("ts");
+            Assert.assertEquals("1969-12-31 23:59:59.999", TimestampUtil.longToDatetime(ts.getTime()));
+
+            // when
+            rs.next();
+            // then
+            ts = rs.getTimestamp("ts");
+            Assert.assertEquals("1970-01-01 00:00:00.000", TimestampUtil.longToDatetime(ts.getTime()));
+
+            // when
+            rs.next();
+            // then
+            ts = rs.getTimestamp("ts");
+            Assert.assertEquals("1970-01-01 08:00:00.000", TimestampUtil.longToDatetime(ts.getTime()));
+
+            // when
+            rs.next();
+            // then
+            ts = rs.getTimestamp("ts");
+            Assert.assertEquals("1970-01-01 07:59:59.999", TimestampUtil.longToDatetime(ts.getTime()));
 
-            ResultSet rs = stmt.executeQuery("select * from weather");
-            while (rs.next()) {
-                Timestamp ts = rs.getTimestamp("ts");
-                System.out.println("long: " + ts.getTime() + ", string: " + TimestampUtil.longToDatetime(ts.getTime()));
-            }
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }
 
-    public static void main(String[] args) {
-        System.out.println("timestamp: " + Long.MAX_VALUE + ", string: " + TimestampUtil.longToDatetime(Long.MAX_VALUE));
-        System.out.println("timestamp: " + Long.MIN_VALUE + ", string: " + TimestampUtil.longToDatetime(Long.MIN_VALUE));
-        System.out.println("timestamp: " + 0 + ", string: " + TimestampUtil.longToDatetime(0));
-        System.out.println("timestamp: " + -1 + ", string: " + TimestampUtil.longToDatetime(-1));
-        String datetime = "1970-01-01 00:00:00.000";
-        System.out.println("timestamp: " + TimestampUtil.datetimeToLong(datetime) + ", string: " + datetime);
-        datetime = "1969-12-31 23:59:59.999";
-        System.out.println("timestamp: " + TimestampUtil.datetimeToLong(datetime) + ", string: " + datetime);
-    }
-
-    @BeforeClass
-    public static void beforeClass() {
+    @Before
+    public void before() {
         try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
-            conn = DriverManager.getConnection("jdbc:TAOS://127.0.0.1:6030/?user=root&password=taosdata");
+            conn = DriverManager.getConnection("jdbc:TAOS://" + host + ":6030/?user=root&password=taosdata");
             Statement stmt = conn.createStatement();
             stmt.execute("drop database if exists test_timestamp");
             stmt.execute("create database if not exists test_timestamp keep 36500");
             stmt.execute("use test_timestamp");
             stmt.execute("create table weather(ts timestamp,f1 float)");
             stmt.close();
-        } catch (ClassNotFoundException | SQLException e) {
+        } catch (SQLException e) {
             e.printStackTrace();
         }
     }
 
-    @AfterClass
-    public static void afterClass() {
+    @After
+    public void after() {
         try {
+            Statement stmt = conn.createStatement();
+            stmt.execute("drop database if exists test_timestamp");
             if (conn != null)
                 conn.close();
         } catch (SQLException e) {
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ImportTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ImportTest.java
index d7603312a0..bc11c7f34e 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ImportTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ImportTest.java
@@ -20,7 +20,6 @@ public class ImportTest {
     @BeforeClass
     public static void before() {
         try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
             Properties properties = new Properties();
             properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
             properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
@@ -33,8 +32,6 @@ public class ImportTest {
             stmt.close();
 
             ts = System.currentTimeMillis();
-        } catch (ClassNotFoundException e) {
-            e.printStackTrace();
         } catch (SQLException e) {
             e.printStackTrace();
         }
@@ -47,7 +44,6 @@ public class ImportTest {
             for (int i = 0; i < 50; i++) {
                 ts++;
                 int row = stmt.executeUpdate("import into " + dbName + "." + tName + " values (" + ts + ", " + (100 + i) + ", " + i + ")");
-                System.out.println("import into " + dbName + "." + tName + " values (" + ts + ", " + (100 + i) + ", " + i + ")\t" + row);
                 assertEquals(1, row);
             }
         }
@@ -84,7 +80,6 @@ public class ImportTest {
                 long t = (++ts) + a;
                 sqlBuilder.append("(").append(t).append(",").append((100 + i)).append(",").append(i).append(") ");
             }
-            System.out.println(sqlBuilder.toString());
             int rows = stmt.executeUpdate(sqlBuilder.toString());
             assertEquals(50, rows);
         } catch (SQLException e) {
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MicroSecondPrecisionJNITest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MicroSecondPrecisionJNITest.java
index 54e4273ea3..eb8f134227 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MicroSecondPrecisionJNITest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MicroSecondPrecisionJNITest.java
@@ -41,7 +41,6 @@ public class MicroSecondPrecisionJNITest {
             rs.next();
 
             Timestamp timestamp = rs.getTimestamp(1);
-            System.out.println(timestamp);
             long ts = timestamp.getTime();
             Assert.assertEquals(timestamp1, ts);
             int nanos = timestamp.getNanos();
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MultiThreadsWithSameStatmentTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MultiThreadsWithSameStatementTest.java
similarity index 84%
rename from src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MultiThreadsWithSameStatmentTest.java
rename to src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MultiThreadsWithSameStatementTest.java
index 5cb76cc0cb..da6853d2fa 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MultiThreadsWithSameStatmentTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/MultiThreadsWithSameStatementTest.java
@@ -7,7 +7,7 @@ import org.junit.Test;
 import java.sql.*;
 import java.util.concurrent.TimeUnit;
 
-public class MultiThreadsWithSameStatmentTest {
+public class MultiThreadsWithSameStatementTest {
 
 
     private class Service {
@@ -16,12 +16,11 @@ public class MultiThreadsWithSameStatmentTest {
 
         public Service() {
             try {
-                Class.forName("com.taosdata.jdbc.TSDBDriver");
                 conn = DriverManager.getConnection("jdbc:TAOS://localhost:6030/?user=root&password=taosdata");
                 stmt = conn.createStatement();
                 stmt.execute("create database if not exists jdbctest");
                 stmt.executeUpdate("create table if not exists jdbctest.weather (ts timestamp, f1 int)");
-            } catch (ClassNotFoundException | SQLException e) {
+            } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
@@ -48,10 +47,6 @@ public class MultiThreadsWithSameStatmentTest {
                 ResultSet resultSet = service.stmt.executeQuery("select * from jdbctest.weather");
                 while (resultSet.next()) {
                     ResultSetMetaData metaData = resultSet.getMetaData();
-                    for (int i = 1; i <= metaData.getColumnCount(); i++) {
-                        System.out.print(metaData.getColumnLabel(i) + ": " + resultSet.getString(i));
-                    }
-                    System.out.println();
                 }
                 resultSet.close();
                 service.release();
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/NullValueInResultSetJNITest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/NullValueInResultSetJNITest.java
index 076125a752..ae0241bf31 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/NullValueInResultSetJNITest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/NullValueInResultSetJNITest.java
@@ -17,11 +17,6 @@ public class NullValueInResultSetJNITest {
             ResultSet rs = stmt.executeQuery("select * from weather");
             ResultSetMetaData meta = rs.getMetaData();
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    Object value = rs.getObject(i);
-                    System.out.print(meta.getColumnLabel(i) + ": " + value + "\t");
-                }
-                System.out.println();
             }
 
         } catch (SQLException e) {
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/NullValueInResultSetRestfulTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/NullValueInResultSetRestfulTest.java
index ea6e36ec1d..7fbb30a524 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/NullValueInResultSetRestfulTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/NullValueInResultSetRestfulTest.java
@@ -19,9 +19,7 @@ public class NullValueInResultSetRestfulTest {
             while (rs.next()) {
                 for (int i = 1; i <= meta.getColumnCount(); i++) {
                     Object value = rs.getObject(i);
-                    System.out.print(meta.getColumnLabel(i) + ": " + value + "\t");
                 }
-                System.out.println();
             }
 
         } catch (SQLException e) {
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/QueryDataTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/QueryDataTest.java
index d0ba113b7a..535e56f7d7 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/QueryDataTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/QueryDataTest.java
@@ -21,7 +21,6 @@ public class QueryDataTest {
     @Before
     public void createDatabase() {
         try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
             Properties properties = new Properties();
             properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
             properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
@@ -36,7 +35,7 @@ public class QueryDataTest {
             String createTableSql = "create table " + stbName + "(ts timestamp, name binary(64))";
             statement.executeUpdate(createTableSql);
 
-        } catch (ClassNotFoundException | SQLException e) {
+        } catch (SQLException e) {
             return;
         }
     }
@@ -44,7 +43,6 @@ public class QueryDataTest {
     @Test
     public void testQueryBinaryData() throws SQLException {
         String insertSql = "insert into " + stbName + " values(now, 'taosdata')";
-        System.out.println(insertSql);
         statement.executeUpdate(insertSql);
 
         String querySql = "select * from " + stbName;
@@ -52,7 +50,6 @@ public class QueryDataTest {
 
         while (rs.next()) {
             String name = rs.getString(2);
-            System.out.println("name = " + name);
             assertEquals("taosdata", name);
         }
         rs.close();
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ResultSetMetaShouldNotBeNullRestfulTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ResultSetMetaShouldNotBeNullRestfulTest.java
index f6d6bb2556..be27b13507 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ResultSetMetaShouldNotBeNullRestfulTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ResultSetMetaShouldNotBeNullRestfulTest.java
@@ -31,7 +31,7 @@ public class ResultSetMetaShouldNotBeNullRestfulTest {
 
         // then
         Assert.assertNotNull(metaData);
-        Assert.assertEquals(0, columnCount);
+        Assert.assertEquals(2, columnCount);
     }
 
     @Test
@@ -53,7 +53,7 @@ public class ResultSetMetaShouldNotBeNullRestfulTest {
         // then
         Assert.assertEquals(true, execute);
         Assert.assertNotNull(metaData);
-        Assert.assertEquals(0, columnCount);
+        Assert.assertEquals(2, columnCount);
     }
 
     @Before
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/SelectTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/SelectTest.java
index 38c8cbb98c..0022ceaf21 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/SelectTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/SelectTest.java
@@ -19,7 +19,6 @@ public class SelectTest {
     @Before
     public void createDatabaseAndTable() {
         try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
             Properties properties = new Properties();
             properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
             properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
@@ -31,8 +30,6 @@ public class SelectTest {
             stmt.execute("create database if not exists " + dbName);
             stmt.execute("create table if not exists " + dbName + "." + tName + " (ts timestamp, k int, v int)");
             stmt.close();
-        } catch (ClassNotFoundException e) {
-            return;
         } catch (SQLException e) {
             e.printStackTrace();
         }
@@ -47,7 +44,6 @@ public class SelectTest {
             for (int i = 0; i < 50; i++) {
                 ts++;
                 int row = stmt.executeUpdate("insert into " + dbName + "." + tName + " values (" + ts + ", " + (100 + i) + ", " + i + ")");
-                System.out.println("insert into " + dbName + "." + tName + " values (" + ts + ", " + (100 + i) + ", " + i + ")\t" + row);
                 assertEquals(1, row);
             }
 
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/StableTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/StableTest.java
index 4575cb73a0..332c171c38 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/StableTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/StableTest.java
@@ -23,7 +23,6 @@ public class StableTest {
     @BeforeClass
     public static void createDatabase() {
         try {
-            Class.forName("com.taosdata.jdbc.TSDBDriver");
             Properties properties = new Properties();
             properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
             properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
@@ -34,8 +33,6 @@ public class StableTest {
             statement.execute("create database if not exists " + dbName);
             statement.execute("use " + dbName);
             statement.close();
-        } catch (ClassNotFoundException e) {
-            return;
         } catch (SQLException e) {
             e.printStackTrace();
         }
@@ -68,9 +65,6 @@ public class StableTest {
             String sql = "describe " + stbName;
             ResultSet rs = stmt.executeQuery(sql);
             while (rs.next()) {
-                for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) {
-                    System.out.println(i + ":" + rs.getString(i));
-                }
                 num++;
             }
             rs.close();
@@ -86,9 +80,6 @@ public class StableTest {
         try (Statement stmt = connection.createStatement()) {
             ResultSet rs = stmt.executeQuery("describe t1");
             while (rs.next()) {
-                for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) {
-                    System.out.printf("%d: %s\n", i, rs.getString(i));
-                }
                 num++;
             }
             rs.close();
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulDriverTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulDriverTest.java
index e239aa068b..c2f732c869 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulDriverTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulDriverTest.java
@@ -8,11 +8,6 @@ import java.sql.*;
 public class RestfulDriverTest {
     private static final String host = "127.0.0.1";
 
-    @Test
-    public void connect() {
-
-    }
-
     @Test
     public void acceptsURL() throws SQLException {
         Driver driver = new RestfulDriver();
@@ -27,9 +22,7 @@ public class RestfulDriverTest {
         Driver driver = new RestfulDriver();
         final String url = "";
         DriverPropertyInfo[] propertyInfo = driver.getPropertyInfo(url, null);
-        for (DriverPropertyInfo prop : propertyInfo) {
-            System.out.println(prop);
-        }
+        Assert.assertNotNull(propertyInfo);
     }
 
     @Test
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulJDBCTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulJDBCTest.java
index c8bb69d827..b07dae8003 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulJDBCTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulJDBCTest.java
@@ -10,132 +10,151 @@ import java.util.Random;
 public class RestfulJDBCTest {
 
     private static final String host = "127.0.0.1";
-    private static Connection connection;
-    private Random random = new Random(System.currentTimeMillis());
+    private final Random random = new Random(System.currentTimeMillis());
+    private Connection connection;
 
-    /**
-     * select * from log.log
-     **/
     @Test
     public void testCase001() {
-        try {
-            Statement statement = connection.createStatement();
-            ResultSet resultSet = statement.executeQuery("select * from log.log");
-            ResultSetMetaData metaData = resultSet.getMetaData();
-            while (resultSet.next()) {
-                for (int i = 1; i <= metaData.getColumnCount(); i++) {
-                    String column = metaData.getColumnLabel(i);
-                    String value = resultSet.getString(i);
-                    System.out.print(column + ":" + value + "\t");
-                }
-                System.out.println();
-            }
-            statement.close();
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
+        // given
+        String sql = "drop database if exists restful_test";
+        // when
+        boolean execute = execute(connection, sql);
+        // then
+        Assert.assertFalse(execute);
+
+        // given
+        sql = "create database if not exists restful_test";
+        // when
+        execute = execute(connection, sql);
+        // then
+        Assert.assertFalse(execute);
+
+        // given
+        sql = "use restful_test";
+        // when
+        execute = execute(connection, sql);
+        // then
+        Assert.assertFalse(execute);
     }
 
-    /**
-     * create database
-     */
     @Test
     public void testCase002() {
-        try (Statement stmt = connection.createStatement()) {
-            stmt.execute("drop database if exists restful_test");
-            stmt.execute("create database if not exists restful_test");
-            stmt.execute("use restful_test");
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    /**
-     * create super table
-     ***/
-    @Test
-    public void testCase003() {
-        try (Statement stmt = connection.createStatement()) {
-            stmt.execute("create table weather(ts timestamp, temperature float, humidity int) tags(location nchar(64), groupId int)");
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
+        // given
+        String sql = "create table weather(ts timestamp, temperature float, humidity int) tags(location nchar(64), groupId int)";
+        // when
+        boolean execute = execute(connection, sql);
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase004() {
-        try (Statement stmt = connection.createStatement()) {
-            for (int i = 1; i <= 100; i++) {
-                stmt.execute("create table t" + i + " using weather tags('beijing', '" + i + "')");
-            }
-        } catch (SQLException e) {
-            e.printStackTrace();
+        for (int i = 1; i <= 100; i++) {
+            // given
+            String sql = "create table t" + i + " using weather tags('beijing', '" + i + "')";
+            // when
+            boolean execute = execute(connection, sql);
+            // then
+            Assert.assertFalse(execute);
         }
     }
 
-
     @Test
     public void testCase005() {
-        try (Statement stmt = connection.createStatement()) {
-            int rows = 0;
-            for (int i = 0; i < 10; i++) {
-                for (int j = 1; j <= 100; j++) {
-                    long currentTimeMillis = System.currentTimeMillis();
-                    int affectRows = stmt.executeUpdate("insert into t" + j + " values(" + currentTimeMillis + "," + (random.nextFloat() * 50) + "," + random.nextInt(100) + ")");
-                    Assert.assertEquals(1, affectRows);
-                    rows += affectRows;
-                }
+        int rows = 0;
+        for (int i = 0; i < 10; i++) {
+            for (int j = 1; j <= 100; j++) {
+
+                // given
+                long currentTimeMillis = System.currentTimeMillis();
+                String sql = "insert into t" + j + " values(" + currentTimeMillis + "," + (random.nextFloat() * 50) + "," + random.nextInt(100) + ")";
+                // when
+                int affectRows = executeUpdate(connection, sql);
+                // then
+                Assert.assertEquals(1, affectRows);
+
+                rows += affectRows;
             }
-            Assert.assertEquals(1000, rows);
-        } catch (SQLException e) {
-            e.printStackTrace();
         }
+        Assert.assertEquals(1000, rows);
     }
 
     @Test
-    public void testCase006() {
-        try (Statement stmt = connection.createStatement()) {
-            ResultSet rs = stmt.executeQuery("select * from weather");
-            while (rs.next()) {
-                System.out.print("ts: " + rs.getTimestamp("ts"));
-                System.out.print(", temperature: " + rs.getString("temperature"));
-                System.out.print(", humidity: " + rs.getString("humidity"));
-                System.out.println(", location: " + rs.getString("location"));
-            }
-        } catch (SQLException e) {
-            e.printStackTrace();
+    public void testCase006() throws SQLException {
+        // given
+        String sql = "select * from weather";
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        ResultSetMetaData meta = rs.getMetaData();
+
+        // then
+        Assert.assertEquals(5, meta.getColumnCount());
+
+        while (rs.next()) {
+            Assert.assertNotNull(rs.getTimestamp("ts"));
+            Assert.assertNotNull(rs.getFloat("temperature"));
+            Assert.assertNotNull(rs.getInt("humidity"));
+            Assert.assertNotNull(rs.getString("location"));
         }
     }
 
     @Test
     public void testCase007() {
+        // given
+        String sql = "drop database restful_test";
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
+    }
+
+    private int executeUpdate(Connection connection, String sql) {
         try (Statement stmt = connection.createStatement()) {
-            ResultSet rs = stmt.executeQuery("select * from weather");
-            ResultSetMetaData meta = rs.getMetaData();
-            while (rs.next()) {
-                int columnCount = meta.getColumnCount();
-                for (int i = 1; i <= columnCount; i++) {
-                    String columnLabel = meta.getColumnLabel(i);
-                    String value = rs.getString(i);
-                    System.out.print(columnLabel + ": " + value + "\t");
-                }
-                System.out.println();
-            }
+            return stmt.executeUpdate(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return 0;
+    }
+
+    private boolean execute(Connection connection, String sql) {
+        try (Statement stmt = connection.createStatement()) {
+            return stmt.execute(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return false;
+    }
+
+
+    private ResultSet executeQuery(Connection connection, String sql) {
+        try (Statement statement = connection.createStatement()) {
+            return statement.executeQuery(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Before
+    public void before() {
+        try {
+            connection = DriverManager.getConnection("jdbc:TAOS-RS://" + host + ":6041/restful_test?user=root&password=taosdata");
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }
 
-    @BeforeClass
-    public static void before() throws ClassNotFoundException, SQLException {
-        Class.forName("com.taosdata.jdbc.rs.RestfulDriver");
-        connection = DriverManager.getConnection("jdbc:TAOS-RS://" + host + ":6041/restful_test?user=root&password=taosdata");
-    }
-
-    @AfterClass
-    public static void after() throws SQLException {
-        if (connection != null)
-            connection.close();
+    @After
+    public void after() {
+        try {
+            if (connection != null)
+                connection.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
     }
 
 }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
index ee457ff412..244e8afd11 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
@@ -27,12 +27,9 @@ public class RestfulPreparedStatementTest {
         ResultSet rs = pstmt_select.executeQuery();
         Assert.assertNotNull(rs);
         ResultSetMetaData meta = rs.getMetaData();
-        while (rs.next()) {
-            for (int i = 1; i <= meta.getColumnCount(); i++) {
-                System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-            }
-            System.out.println();
-        }
+        int columnCount = meta.getColumnCount();
+        Assert.assertEquals(10, columnCount);
+        Assert.assertNotNull(rs);
     }
 
     @Test
@@ -373,18 +370,19 @@ public class RestfulPreparedStatementTest {
     @BeforeClass
     public static void beforeClass() {
         try {
-            Class.forName("com.taosdata.jdbc.rs.RestfulDriver");
             conn = DriverManager.getConnection("jdbc:TAOS-RS://" + host + ":6041/?user=root&password=taosdata");
-            try (Statement stmt = conn.createStatement()) {
-                stmt.execute("drop database if exists test_pstmt");
-                stmt.execute("create database if not exists test_pstmt");
-                stmt.execute("use test_pstmt");
-                stmt.execute("create table weather(ts timestamp, f1 int, f2 bigint, f3 float, f4 double, f5 smallint, f6 tinyint, f7 bool, f8 binary(64), f9 nchar(64)) tags(loc nchar(64))");
-                stmt.execute("create table t1 using weather tags('beijing')");
-            }
+
+            Statement stmt = conn.createStatement();
+            stmt.execute("drop database if exists test_pstmt");
+            stmt.execute("create database if not exists test_pstmt");
+            stmt.execute("use test_pstmt");
+            stmt.execute("create table weather(ts timestamp, f1 int, f2 bigint, f3 float, f4 double, f5 smallint, f6 tinyint, f7 bool, f8 binary(64), f9 nchar(64)) tags(loc nchar(64))");
+            stmt.execute("create table t1 using weather tags('beijing')");
+            stmt.close();
+
             pstmt_insert = conn.prepareStatement(sql_insert);
             pstmt_select = conn.prepareStatement(sql_select);
-        } catch (ClassNotFoundException | SQLException e) {
+        } catch (SQLException e) {
             e.printStackTrace();
         }
     }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulStatementTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulStatementTest.java
index 1be32b502d..a7b3ceb9d3 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulStatementTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulStatementTest.java
@@ -12,6 +12,7 @@ import java.util.UUID;
 
 public class RestfulStatementTest {
     private static final String host = "127.0.0.1";
+
     private static Connection conn;
     private static Statement stmt;
 
@@ -21,11 +22,11 @@ public class RestfulStatementTest {
             ResultSet rs = stmt.executeQuery("show databases");
             Assert.assertNotNull(rs);
             ResultSetMetaData meta = rs.getMetaData();
+            int columnCount = meta.getColumnCount();
+            Assert.assertTrue(columnCount > 1);
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-                }
-                System.out.println();
+                Assert.assertEquals("name", meta.getColumnLabel(1));
+                Assert.assertNotNull(rs.getString("name"));
             }
             rs.close();
         } catch (SQLException e) {
@@ -174,10 +175,10 @@ public class RestfulStatementTest {
             Assert.assertEquals(3, meta.getColumnCount());
             int count = 0;
             while (rs.next()) {
-                for (int i = 1; i <= meta.getColumnCount(); i++) {
-                    System.out.print(meta.getColumnLabel(i) + ": " + rs.getString(i) + "\t");
-                }
-                System.out.println();
+                Assert.assertEquals("ts", meta.getColumnLabel(1));
+                Assert.assertNotNull(rs.getTimestamp(1));
+                Assert.assertEquals("temperature", meta.getColumnLabel(2));
+                Assert.assertEquals(22.33, rs.getFloat(2), 0.001f);
                 count++;
             }
             Assert.assertEquals(1, count);
@@ -388,15 +389,12 @@ public class RestfulStatementTest {
     @BeforeClass
     public static void beforeClass() {
         try {
-            Class.forName("com.taosdata.jdbc.rs.RestfulDriver");
             Properties properties = new Properties();
             properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
             properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
             properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
             conn = DriverManager.getConnection("jdbc:TAOS-RS://" + host + ":6041/?user=root&password=taosdata", properties);
             stmt = conn.createStatement();
-        } catch (ClassNotFoundException e) {
-            e.printStackTrace();
         } catch (SQLException e) {
             e.printStackTrace();
         }
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/SQLTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/SQLTest.java
index 4ad9826384..6b88de258d 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/SQLTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/SQLTest.java
@@ -1,342 +1,586 @@
 package com.taosdata.jdbc.rs;
 
-import com.taosdata.jdbc.utils.SQLExecutor;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.FixMethodOrder;
-import org.junit.Test;
+import org.junit.*;
 import org.junit.runners.MethodSorters;
 
 import java.sql.*;
 
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
 public class SQLTest {
+
     private static final String host = "127.0.0.1";
     private static Connection connection;
 
     @Test
     public void testCase001() {
+        // given
         String sql = "create database if not exists restful_test";
-        SQLExecutor.execute(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase002() {
+        // given
         String sql = "use restful_test";
-        SQLExecutor.execute(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase003() {
+        // given
         String sql = "show databases";
-        SQLExecutor.executeWithResult(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase004() {
+        // given
         String sql = "show tables";
-        SQLExecutor.executeWithResult(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase005() {
+        // given
         String sql = "show stables";
-        SQLExecutor.executeWithResult(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase006() {
+        // given
         String sql = "show dnodes";
-        SQLExecutor.executeWithResult(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase007() {
+        // given
         String sql = "show vgroups";
-        SQLExecutor.executeWithResult(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase008() {
+        // given
         String sql = "drop table if exists restful_test.weather";
-        SQLExecutor.execute(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase009() {
+        // given
         String sql = "create table if not exists restful_test.weather(ts timestamp, temperature float) tags(location nchar(64))";
-        SQLExecutor.execute(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase010() {
+        // given
         String sql = "create table t1 using restful_test.weather tags('北京')";
-        SQLExecutor.execute(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase011() {
+        // given
         String sql = "insert into restful_test.t1 values(now, 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase012() {
+        // given
         String sql = "insert into restful_test.t1 values('2020-01-01 00:00:00.000', 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase013() {
+        // given
         String sql = "insert into restful_test.t1 values('2020-01-01 00:01:00.000', 22.22),('2020-01-01 00:02:00.000', 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase014() {
+        // given
         String sql = "insert into restful_test.t2 using weather tags('上海') values('2020-01-01 00:03:00.000', 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase015() {
+        // given
         String sql = "insert into restful_test.t2 using weather tags('上海') values('2020-01-01 00:01:00.000', 22.22),('2020-01-01 00:02:00.000', 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase016() {
+        // given
         String sql = "insert into t1 values('2020-01-01 01:0:00.000', 22.22),('2020-01-01 02:00:00.000', 22.22) t2 values('2020-01-01 01:0:00.000', 33.33),('2020-01-01 02:00:00.000', 33.33)";
-        SQLExecutor.executeUpdate(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase017() {
+        // given
         String sql = "Insert into t3 using weather tags('广东') values('2020-01-01 01:0:00.000', 22.22),('2020-01-01 02:00:00.000', 22.22) t4 using weather tags('天津') values('2020-01-01 01:0:00.000', 33.33),('2020-01-01 02:00:00.000', 33.33)";
-        SQLExecutor.executeUpdate(connection, sql);
+
+        // when
+        boolean execute = execute(connection, sql);
+
+        // then
+        Assert.assertFalse(execute);
     }
 
     @Test
     public void testCase018() {
+        // given
         String sql = "select * from restful_test.t1";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        boolean execute = execute(connection, sql);
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase019() {
+        // given
         String sql = "select * from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        boolean execute = execute(connection, sql);
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase020() {
+        // given
         String sql = "select ts, temperature from restful_test.t1";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        boolean execute = execute(connection, sql);
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase021() {
+        // given
         String sql = "select ts, temperature from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        boolean execute = execute(connection, sql);
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase022() {
+        // given
         String sql = "select temperature, ts from restful_test.t1";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        boolean execute = execute(connection, sql);
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase023() {
+        // given
         String sql = "select temperature, ts from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        boolean execute = execute(connection, sql);
+        // then
+        Assert.assertTrue(execute);
     }
 
     @Test
     public void testCase024() {
+        // given
         String sql = "import into restful_test.t5 using weather tags('石家庄') values('2020-01-01 00:01:00.000', 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+        // when
+        int affectedRows = executeUpdate(connection, sql);
+        // then
+        Assert.assertEquals(1, affectedRows);
     }
 
     @Test
     public void testCase025() {
+        // given
         String sql = "import into restful_test.t6 using weather tags('沈阳') values('2020-01-01 00:01:00.000', 22.22),('2020-01-01 00:02:00.000', 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+        // when
+        int affectedRows = executeUpdate(connection, sql);
+        // then
+        Assert.assertEquals(2, affectedRows);
     }
 
     @Test
     public void testCase026() {
+        // given
         String sql = "import into restful_test.t7 using weather tags('长沙') values('2020-01-01 00:01:00.000', 22.22) restful_test.t8 using weather tags('吉林') values('2020-01-01 00:01:00.000', 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+
+        // when
+        int affectedRows = executeUpdate(connection, sql);
+        // then
+        Assert.assertEquals(2, affectedRows);
     }
 
     @Test
     public void testCase027() {
+        // given
         String sql = "import into restful_test.t9 using weather tags('武汉') values('2020-01-01 00:01:00.000', 22.22) ,('2020-01-02 00:01:00.000', 22.22) restful_test.t10 using weather tags('哈尔滨') values('2020-01-01 00:01:00.000', 22.22),('2020-01-02 00:01:00.000', 22.22)";
-        SQLExecutor.executeUpdate(connection, sql);
+        // when
+        int affectedRows = executeUpdate(connection, sql);
+        // then
+        Assert.assertEquals(4, affectedRows);
     }
 
     @Test
     public void testCase028() {
+        // given
         String sql = "select location, temperature, ts from restful_test.weather where temperature > 1";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase029() {
         String sql = "select location, temperature, ts from restful_test.weather where temperature < 1";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase030() {
         String sql = "select location, temperature, ts from restful_test.weather where ts  > now";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase031() {
         String sql = "select location, temperature, ts from restful_test.weather where ts  < now";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase032() {
         String sql = "select count(*) from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase033() {
         String sql = "select first(*) from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase034() {
         String sql = "select last(*) from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase035() {
         String sql = "select last_row(*) from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase036() {
         String sql = "select ts, ts as primary_key from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
 
     @Test
     public void testCase037() {
         String sql = "select database()";
-        SQLExecutor.execute(connection, "use restful_test");
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase038() {
         String sql = "select client_version()";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase039() {
         String sql = "select server_status()";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase040() {
         String sql = "select server_status() as status";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase041() {
         String sql = "select tbname, location from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase042() {
         String sql = "select count(tbname) from restful_test.weather";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase043() {
         String sql = "select * from restful_test.weather where ts < now - 1h";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase044() {
         String sql = "select * from restful_test.weather where ts < now - 1h and location like '%'";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase045() {
         String sql = "select * from restful_test.weather where ts < now - 1h order by ts";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase046() {
         String sql = "select last(*) from restful_test.weather where ts < now - 1h group by tbname order by tbname";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase047() {
         String sql = "select * from restful_test.weather limit 2";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase048() {
         String sql = "select * from restful_test.weather limit 2 offset 5";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase049() {
         String sql = "select * from restful_test.t1, restful_test.t3 where t1.ts = t3.ts ";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase050() {
         String sql = "select * from restful_test.t1, restful_test.t3 where t1.ts = t3.ts and t1.location = t3.location";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase051() {
         String sql = "select * from restful_test.t1 tt, restful_test.t3 yy where tt.ts = yy.ts";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase052() {
         String sql = "select server_status()";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
     }
 
     @Test
     public void testCase053() {
         String sql = "select avg(cpu_taosd), avg(cpu_system), max(cpu_cores), avg(mem_taosd), avg(mem_system), max(mem_total), avg(disk_used), max(disk_total), avg(band_speed), avg(io_read), avg(io_write), sum(req_http), sum(req_select), sum(req_insert) from log.dn1 where ts> now - 60m and ts<= now interval(1m) fill(value, 0)";
-        SQLExecutor.executeQuery(connection, sql);
+        // when
+        ResultSet rs = executeQuery(connection, sql);
+        // then
+        Assert.assertNotNull(rs);
+    }
+
+    private boolean execute(Connection connection, String sql) {
+        try (Statement statement = connection.createStatement()) {
+            return statement.execute(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return false;
+    }
+
+    private ResultSet executeQuery(Connection connection, String sql) {
+        try (Statement statement = connection.createStatement()) {
+            return statement.executeQuery(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    private int executeUpdate(Connection connection, String sql) {
+        try (Statement statement = connection.createStatement()) {
+            return statement.executeUpdate(sql);
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return 0;
     }
 
     @BeforeClass
-    public static void before() throws ClassNotFoundException, SQLException {
-        Class.forName("com.taosdata.jdbc.rs.RestfulDriver");
+    public static void before() throws SQLException {
         connection = DriverManager.getConnection("jdbc:TAOS-RS://" + host + ":6041/restful_test?user=root&password=taosdata");
     }
 
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/SQLExecutor.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/SQLExecutor.java
deleted file mode 100644
index bf034bf458..0000000000
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/utils/SQLExecutor.java
+++ /dev/null
@@ -1,74 +0,0 @@
-package com.taosdata.jdbc.utils;
-
-import java.sql.*;
-
-public class SQLExecutor {
-
-    // insert, import
-    public static void executeUpdate(Connection connection, String sql) {
-        try (Statement statement = connection.createStatement()) {
-            long start = System.currentTimeMillis();
-            int affectedRows = statement.executeUpdate(sql);
-            long end = System.currentTimeMillis();
-            System.out.println("[ affected rows : " + affectedRows + " ] time cost: " + (end - start) + " ms, execute statement ====> " + sql);
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    // show databases, show tables, show stables
-    public static void executeWithResult(Connection connection, String sql) {
-        try (Statement statement = connection.createStatement()) {
-            statement.execute(sql);
-            ResultSet resultSet = statement.getResultSet();
-            printResult(resultSet);
-        } catch (SQLException e) {
-            e.printStackTrace();
-        }
-    }
-
-    // use database, create database, create table, drop table...
-    public static void execute(Connection connection, String sql) {
-        try (Statement statement = connection.createStatement()) {
-            long start = System.currentTimeMillis();
-            boolean execute = statement.execute(sql);
-            long end = System.currentTimeMillis();
-            printSql(sql, execute, (end - start));
-        } catch (SQLException e) {
-            System.out.println("ERROR execute SQL ===> " + sql);
-            e.printStackTrace();
-        }
-    }
-
-    // select
-    public static void executeQuery(Connection connection, String sql) {
-        try (Statement statement = connection.createStatement()) {
-            long start = System.currentTimeMillis();
-            ResultSet resultSet = statement.executeQuery(sql);
-            long end = System.currentTimeMillis();
-            printSql(sql, true, (end - start));
-            printResult(resultSet);
-        } catch (SQLException e) {
-            System.out.println("ERROR execute SQL ===> " + sql);
-            e.printStackTrace();
-        }
-    }
-
-    private static void printSql(String sql, boolean succeed, long cost) {
-        System.out.println("[ " + (succeed ? "OK" : "ERROR!") + " ] time cost: " + cost + " ms, execute statement ====> " + sql);
-    }
-
-    private static void printResult(ResultSet resultSet) throws SQLException {
-        ResultSetMetaData metaData = resultSet.getMetaData();
-        while (resultSet.next()) {
-            StringBuilder sb = new StringBuilder();
-            for (int i = 1; i <= metaData.getColumnCount(); i++) {
-                String columnLabel = metaData.getColumnLabel(i);
-                String value = resultSet.getString(i);
-                sb.append(columnLabel + ": " + value + "\t");
-            }
-            System.out.println(sb.toString());
-        }
-    }
-
-}
diff --git a/src/connector/nodejs/nodetaos/cinterface.js b/src/connector/nodejs/nodetaos/cinterface.js
index f3961e3787..1c2685b8cb 100644
--- a/src/connector/nodejs/nodetaos/cinterface.js
+++ b/src/connector/nodejs/nodetaos/cinterface.js
@@ -126,28 +126,18 @@ function convertDouble(data, num_of_rows, nbytes = 0, offset = 0, micro = false)
   }
   return res;
 }
-function convertBinary(data, num_of_rows, nbytes = 0, offset = 0, micro = false) {
-  data = ref.reinterpret(data.deref(), nbytes * num_of_rows, offset);
-  let res = [];
-  let currOffset = 0;
-  while (currOffset < data.length) {
-    let dataEntry = data.slice(currOffset, currOffset + nbytes);
-    if (dataEntry[0] == FieldTypes.C_BINARY_NULL) {
-      res.push(null);
-    }
-    else {
-      res.push(ref.readCString(dataEntry));
-    }
-    currOffset += nbytes;
-  }
-  return res;
-}
+
 function convertNchar(data, num_of_rows, nbytes = 0, offset = 0, micro = false) {
   data = ref.reinterpret(data.deref(), nbytes * num_of_rows, offset);
   let res = [];
-  let dataEntry = data.slice(0, nbytes); //one entry in a row under a column;
-  //TODO: should use the correct character encoding 
-  res.push(dataEntry.toString("utf-8"));
+
+  let currOffset = 0;
+  while (currOffset < data.length) {
+    let len = data.readIntLE(currOffset, 2);
+    let dataEntry = data.slice(currOffset + 2, currOffset + len + 2); //one entry in a row under a column;
+    res.push(dataEntry.toString("utf-8"));
+    currOffset += nbytes;
+  }
   return res;
 }
 
@@ -160,7 +150,7 @@ let convertFunctions = {
   [FieldTypes.C_BIGINT]: convertBigint,
   [FieldTypes.C_FLOAT]: convertFloat,
   [FieldTypes.C_DOUBLE]: convertDouble,
-  [FieldTypes.C_BINARY]: convertBinary,
+  [FieldTypes.C_BINARY]: convertNchar,
   [FieldTypes.C_TIMESTAMP]: convertTimestamp,
   [FieldTypes.C_NCHAR]: convertNchar
 }
diff --git a/src/connector/nodejs/package.json b/src/connector/nodejs/package.json
index d21b62108b..b57d4c635c 100644
--- a/src/connector/nodejs/package.json
+++ b/src/connector/nodejs/package.json
@@ -1,6 +1,6 @@
 {
   "name": "td2.0-connector",
-  "version": "2.0.7",
+  "version": "2.0.8",
   "description": "A Node.js connector for TDengine.",
   "main": "tdengine.js",
   "directories": {
diff --git a/src/inc/tbn.h b/src/inc/tbn.h
index b9f4e3c608..b35f90eb15 100644
--- a/src/inc/tbn.h
+++ b/src/inc/tbn.h
@@ -31,6 +31,7 @@ void    bnReset();
 int32_t bnAllocVnodes(struct SVgObj *pVgroup);
 int32_t bnAlterDnode(struct SDnodeObj *pDnode, int32_t vnodeId, int32_t dnodeId);
 int32_t bnDropDnode(struct SDnodeObj *pDnode);
+int32_t bnDnodeCanCreateMnode(struct SDnodeObj *pDnode);
 
 #ifdef __cplusplus
 }
diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index 0eac1518a7..93fac54233 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -636,6 +636,9 @@ static FILE *          g_fpOfInsertResult = NULL;
 #define errorPrint(fmt, ...) \
     do { fprintf(stderr, "ERROR: "fmt, __VA_ARGS__); } while(0)
 
+// for strncpy buffer overflow
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+
 
 ///////////////////////////////////////////////////
 
@@ -1204,23 +1207,24 @@ static void fetchResult(TAOS_RES *res, threadInfo* pThreadInfo) {
     return ;
   }
 
-  int   totalLen = 0;
+  int64_t   totalLen = 0;
 
   // fetch the records row by row
   while((row = taos_fetch_row(res))) {
-    if ((strlen(pThreadInfo->filePath) > 0)
-            && (totalLen >= 100*1024*1024 - 32000)) {
-        appendResultBufToFile(databuf, pThreadInfo);
+    if (totalLen >= 100*1024*1024 - 32000) {
+        if (strlen(pThreadInfo->filePath) > 0)
+            appendResultBufToFile(databuf, pThreadInfo);
         totalLen = 0;
         memset(databuf, 0, 100*1024*1024);
     }
     num_rows++;
-    char temp[16000] = {0};
+    char  temp[16000] = {0};
     int len = taos_print_row(temp, row, fields, num_fields);
     len += sprintf(temp + len, "\n");
     //printf("query result:%s\n", temp);
     memcpy(databuf + totalLen, temp, len);
     totalLen += len;
+    verbosePrint("%s() LN%d, totalLen: %"PRId64"\n", __func__, __LINE__, totalLen);
   }
 
   verbosePrint("%s() LN%d, databuf=%s resultFile=%s\n",
@@ -2573,7 +2577,7 @@ static int getSuperTableFromServer(TAOS * taos, char* dbName,
               fields[TSDB_DESCRIBE_METRIC_FIELD_INDEX].bytes);
       tstrncpy(superTbls->tags[tagIndex].dataType,
               (char *)row[TSDB_DESCRIBE_METRIC_TYPE_INDEX],
-              fields[TSDB_DESCRIBE_METRIC_TYPE_INDEX].bytes);
+              min(15, fields[TSDB_DESCRIBE_METRIC_TYPE_INDEX].bytes));
       superTbls->tags[tagIndex].dataLen =
           *((int *)row[TSDB_DESCRIBE_METRIC_LENGTH_INDEX]);
       tstrncpy(superTbls->tags[tagIndex].note,
@@ -2586,7 +2590,7 @@ static int getSuperTableFromServer(TAOS * taos, char* dbName,
               fields[TSDB_DESCRIBE_METRIC_FIELD_INDEX].bytes);
       tstrncpy(superTbls->columns[columnIndex].dataType,
               (char *)row[TSDB_DESCRIBE_METRIC_TYPE_INDEX],
-              fields[TSDB_DESCRIBE_METRIC_TYPE_INDEX].bytes);
+              min(15, fields[TSDB_DESCRIBE_METRIC_TYPE_INDEX].bytes));
       superTbls->columns[columnIndex].dataLen =
           *((int *)row[TSDB_DESCRIBE_METRIC_LENGTH_INDEX]);
       tstrncpy(superTbls->columns[columnIndex].note,
@@ -4407,14 +4411,12 @@ static bool getMetaFromQueryJsonFile(cJSON* root) {
 
         cJSON* resubAfterConsume =
             cJSON_GetObjectItem(specifiedQuery, "resubAfterConsume");
+        g_queryInfo.specifiedQueryInfo.resubAfterConsume[j] = -1;
         if ((resubAfterConsume)
                 && (resubAfterConsume->type == cJSON_Number)
                 && (resubAfterConsume->valueint >= 0)) {
             g_queryInfo.specifiedQueryInfo.resubAfterConsume[j]
                 = resubAfterConsume->valueint;
-        } else if (!resubAfterConsume) {
-            // default value is -1, which mean do not resub
-            g_queryInfo.specifiedQueryInfo.resubAfterConsume[j] = -1;
         }
 
         cJSON *result = cJSON_GetObjectItem(sql, "result");
@@ -4571,14 +4573,12 @@ static bool getMetaFromQueryJsonFile(cJSON* root) {
 
     cJSON* superResubAfterConsume =
             cJSON_GetObjectItem(superQuery, "resubAfterConsume");
+    g_queryInfo.superQueryInfo.resubAfterConsume = -1;
     if ((superResubAfterConsume)
             && (superResubAfterConsume->type == cJSON_Number)
             && (superResubAfterConsume->valueint >= 0)) {
         g_queryInfo.superQueryInfo.resubAfterConsume =
             superResubAfterConsume->valueint;
-    } else if (!superResubAfterConsume) {
-        // default value is -1, which mean do not resub
-        g_queryInfo.superQueryInfo.resubAfterConsume = -1;
     }
 
     // supert table sqls
@@ -7221,151 +7221,159 @@ static TAOS_SUB* subscribeImpl(
   }
 
   if (tsub == NULL) {
-    printf("failed to create subscription. topic:%s, sql:%s\n", topic, sql);
-    return NULL;
+      errorPrint("failed to create subscription. topic:%s, sql:%s\n", topic, sql);
+      return NULL;
   }
 
   return tsub;
 }
 
 static void *superSubscribe(void *sarg) {
-  threadInfo *pThreadInfo = (threadInfo *)sarg;
-  char subSqlstr[MAX_QUERY_SQL_LENGTH];
-  TAOS_SUB*    tsub[MAX_QUERY_SQL_COUNT] = {0};
-  uint64_t tsubSeq;
+    threadInfo *pThreadInfo = (threadInfo *)sarg;
+    char subSqlstr[MAX_QUERY_SQL_LENGTH];
+    TAOS_SUB*    tsub[MAX_QUERY_SQL_COUNT] = {0};
+    uint64_t tsubSeq;
 
-  if (pThreadInfo->ntables > MAX_QUERY_SQL_COUNT) {
-      errorPrint("The table number(%"PRId64") of the thread is more than max query sql count: %d\n",
-              pThreadInfo->ntables,
-              MAX_QUERY_SQL_COUNT);
-      exit(-1);
-  }
-
-  if (pThreadInfo->taos == NULL) {
-    pThreadInfo->taos = taos_connect(g_queryInfo.host,
-          g_queryInfo.user,
-          g_queryInfo.password,
-          g_queryInfo.dbName,
-          g_queryInfo.port);
-    if (pThreadInfo->taos == NULL) {
-      errorPrint("[%d] Failed to connect to TDengine, reason:%s\n",
-            pThreadInfo->threadID, taos_errstr(NULL));
-      return NULL;
+    if (pThreadInfo->ntables > MAX_QUERY_SQL_COUNT) {
+        errorPrint("The table number(%"PRId64") of the thread is more than max query sql count: %d\n",
+                pThreadInfo->ntables, MAX_QUERY_SQL_COUNT);
+        exit(-1);
     }
-  }
 
-  char sqlStr[MAX_TB_NAME_SIZE*2];
-  sprintf(sqlStr, "use %s", g_queryInfo.dbName);
-  if (0 != queryDbExec(pThreadInfo->taos, sqlStr, NO_INSERT_TYPE, false)) {
-    taos_close(pThreadInfo->taos);
-    errorPrint( "use database %s failed!\n\n",
-                g_queryInfo.dbName);
-    return NULL;
-  }
+    if (pThreadInfo->taos == NULL) {
+        pThreadInfo->taos = taos_connect(g_queryInfo.host,
+                g_queryInfo.user,
+                g_queryInfo.password,
+                g_queryInfo.dbName,
+                g_queryInfo.port);
+        if (pThreadInfo->taos == NULL) {
+            errorPrint("[%d] Failed to connect to TDengine, reason:%s\n",
+                    pThreadInfo->threadID, taos_errstr(NULL));
+            return NULL;
+        }
+    }
 
-  char topic[32] = {0};
-  for (uint64_t i = pThreadInfo->start_table_from;
-          i <= pThreadInfo->end_table_to; i++) {
-
-      tsubSeq = i - pThreadInfo->start_table_from;
-      verbosePrint("%s() LN%d, [%d], start=%"PRId64" end=%"PRId64" i=%"PRIu64"\n",
-              __func__, __LINE__,
-              pThreadInfo->threadID,
-              pThreadInfo->start_table_from,
-              pThreadInfo->end_table_to, i);
-      sprintf(topic, "taosdemo-subscribe-%"PRIu64"-%"PRIu64"",
-              i, pThreadInfo->querySeq);
-      memset(subSqlstr, 0, sizeof(subSqlstr));
-      replaceChildTblName(
-              g_queryInfo.superQueryInfo.sql[pThreadInfo->querySeq],
-              subSqlstr, i);
-      if (g_queryInfo.superQueryInfo.result[pThreadInfo->querySeq][0] != 0) {
-        sprintf(pThreadInfo->filePath, "%s-%d",
-                g_queryInfo.superQueryInfo.result[pThreadInfo->querySeq],
-                pThreadInfo->threadID);
-      }
-
-      debugPrint("%s() LN%d, [%d] subSqlstr: %s\n",
-              __func__, __LINE__, pThreadInfo->threadID, subSqlstr);
-      tsub[tsubSeq] = subscribeImpl(
-              STABLE_CLASS,
-              pThreadInfo, subSqlstr, topic,
-              g_queryInfo.superQueryInfo.subscribeRestart,
-              g_queryInfo.superQueryInfo.subscribeInterval);
-      if (NULL == tsub[tsubSeq]) {
+    char sqlStr[MAX_TB_NAME_SIZE*2];
+    sprintf(sqlStr, "use %s", g_queryInfo.dbName);
+    if (0 != queryDbExec(pThreadInfo->taos, sqlStr, NO_INSERT_TYPE, false)) {
         taos_close(pThreadInfo->taos);
+        errorPrint( "use database %s failed!\n\n",
+                g_queryInfo.dbName);
         return NULL;
-      }
-  }
+    }
 
-  // start loop to consume result
-  int consumed[MAX_QUERY_SQL_COUNT];
-  for (int i = 0; i < MAX_QUERY_SQL_COUNT; i++) {
-    consumed[i] = 0;
-  }
-  TAOS_RES* res = NULL;
+    char topic[32] = {0};
+    for (uint64_t i = pThreadInfo->start_table_from;
+            i <= pThreadInfo->end_table_to; i++) {
+        tsubSeq = i - pThreadInfo->start_table_from;
+        verbosePrint("%s() LN%d, [%d], start=%"PRId64" end=%"PRId64" i=%"PRIu64"\n",
+                __func__, __LINE__,
+                pThreadInfo->threadID,
+                pThreadInfo->start_table_from,
+                pThreadInfo->end_table_to, i);
+        sprintf(topic, "taosdemo-subscribe-%"PRIu64"-%"PRIu64"",
+                i, pThreadInfo->querySeq);
+        memset(subSqlstr, 0, sizeof(subSqlstr));
+        replaceChildTblName(
+                g_queryInfo.superQueryInfo.sql[pThreadInfo->querySeq],
+                subSqlstr, i);
+        if (g_queryInfo.superQueryInfo.result[pThreadInfo->querySeq][0] != 0) {
+            sprintf(pThreadInfo->filePath, "%s-%d",
+                    g_queryInfo.superQueryInfo.result[pThreadInfo->querySeq],
+                    pThreadInfo->threadID);
+        }
 
-  uint64_t st = 0, et = 0;
+        verbosePrint("%s() LN%d, [%d] subSqlstr: %s\n",
+                __func__, __LINE__, pThreadInfo->threadID, subSqlstr);
+        tsub[tsubSeq] = subscribeImpl(
+                STABLE_CLASS,
+                pThreadInfo, subSqlstr, topic,
+                g_queryInfo.superQueryInfo.subscribeRestart,
+                g_queryInfo.superQueryInfo.subscribeInterval);
+        if (NULL == tsub[tsubSeq]) {
+            taos_close(pThreadInfo->taos);
+            return NULL;
+        }
+    }
 
-  while ((g_queryInfo.superQueryInfo.endAfterConsume == -1)
-          || (g_queryInfo.superQueryInfo.endAfterConsume <
-              consumed[pThreadInfo->end_table_to - pThreadInfo->start_table_from])) {
+    // start loop to consume result
+    int consumed[MAX_QUERY_SQL_COUNT];
+    for (int i = 0; i < MAX_QUERY_SQL_COUNT; i++) {
+        consumed[i] = 0;
+    }
+    TAOS_RES* res = NULL;
+
+    uint64_t st = 0, et = 0;
+
+    while ((g_queryInfo.superQueryInfo.endAfterConsume == -1)
+            || (g_queryInfo.superQueryInfo.endAfterConsume >
+                consumed[pThreadInfo->end_table_to
+                - pThreadInfo->start_table_from])) {
+
+        verbosePrint("super endAfterConsume: %d, consumed: %d\n",
+                g_queryInfo.superQueryInfo.endAfterConsume,
+                consumed[pThreadInfo->end_table_to
+                - pThreadInfo->start_table_from]);
+        for (uint64_t i = pThreadInfo->start_table_from;
+                i <= pThreadInfo->end_table_to; i++) {
+            tsubSeq = i - pThreadInfo->start_table_from;
+            if (ASYNC_MODE == g_queryInfo.superQueryInfo.asyncMode) {
+                continue;
+            }
+
+            st = taosGetTimestampMs();
+            performancePrint("st: %"PRIu64" et: %"PRIu64" st-et: %"PRIu64"\n", st, et, (st - et));
+            res = taos_consume(tsub[tsubSeq]);
+            et = taosGetTimestampMs();
+            performancePrint("st: %"PRIu64" et: %"PRIu64" delta: %"PRIu64"\n", st, et, (et - st));
+
+            if (res) {
+                if (g_queryInfo.superQueryInfo.result[pThreadInfo->querySeq][0] != 0) {
+                    sprintf(pThreadInfo->filePath, "%s-%d",
+                            g_queryInfo.superQueryInfo.result[pThreadInfo->querySeq],
+                            pThreadInfo->threadID);
+                    fetchResult(res, pThreadInfo);
+                }
+                consumed[tsubSeq] ++;
+
+                if ((g_queryInfo.superQueryInfo.resubAfterConsume != -1)
+                        && (consumed[tsubSeq] >=
+                            g_queryInfo.superQueryInfo.resubAfterConsume)) {
+                    verbosePrint("%s() LN%d, keepProgress:%d, resub super table query: %"PRIu64"\n",
+                            __func__, __LINE__,
+                            g_queryInfo.superQueryInfo.subscribeKeepProgress,
+                            pThreadInfo->querySeq);
+                    taos_unsubscribe(tsub[tsubSeq],
+                            g_queryInfo.superQueryInfo.subscribeKeepProgress);
+                    consumed[tsubSeq]= 0;
+                    tsub[tsubSeq] = subscribeImpl(
+                            STABLE_CLASS,
+                            pThreadInfo, subSqlstr, topic,
+                            g_queryInfo.superQueryInfo.subscribeRestart,
+                            g_queryInfo.superQueryInfo.subscribeInterval
+                            );
+                    if (NULL == tsub[tsubSeq]) {
+                        taos_close(pThreadInfo->taos);
+                        return NULL;
+                    }
+                }
+            }
+        }
+    }
+    verbosePrint("%s() LN%d, super endAfterConsume: %d, consumed: %d\n",
+            __func__, __LINE__,
+            g_queryInfo.superQueryInfo.endAfterConsume,
+            consumed[pThreadInfo->end_table_to - pThreadInfo->start_table_from]);
+    taos_free_result(res);
 
     for (uint64_t i = pThreadInfo->start_table_from;
             i <= pThreadInfo->end_table_to; i++) {
-      tsubSeq = i - pThreadInfo->start_table_from;
-      if (ASYNC_MODE == g_queryInfo.superQueryInfo.asyncMode) {
-          continue;
-      }
-
-      st = taosGetTimestampMs();
-      performancePrint("st: %"PRIu64" et: %"PRIu64" st-et: %"PRIu64"\n", st, et, (st - et));
-      res = taos_consume(tsub[tsubSeq]);
-      et = taosGetTimestampMs();
-      performancePrint("st: %"PRIu64" et: %"PRIu64" delta: %"PRIu64"\n", st, et, (et - st));
-
-      if (res) {
-          if (g_queryInfo.superQueryInfo.result[pThreadInfo->querySeq][0] != 0) {
-              sprintf(pThreadInfo->filePath, "%s-%d",
-                      g_queryInfo.superQueryInfo.result[pThreadInfo->querySeq],
-                      pThreadInfo->threadID);
-              fetchResult(res, pThreadInfo);
-          }
-          consumed[tsubSeq] ++;
-
-          if ((g_queryInfo.superQueryInfo.resubAfterConsume != -1)
-                  && (consumed[tsubSeq] >=
-                      g_queryInfo.superQueryInfo.resubAfterConsume)) {
-              printf("keepProgress:%d, resub super table query: %"PRIu64"\n",
-                      g_queryInfo.superQueryInfo.subscribeKeepProgress,
-                      pThreadInfo->querySeq);
-              taos_unsubscribe(tsub[tsubSeq],
-                    g_queryInfo.superQueryInfo.subscribeKeepProgress);
-              consumed[tsubSeq]= 0;
-              tsub[tsubSeq] = subscribeImpl(
-                      STABLE_CLASS,
-                      pThreadInfo, subSqlstr, topic,
-                      g_queryInfo.superQueryInfo.subscribeRestart,
-                      g_queryInfo.superQueryInfo.subscribeInterval
-                      );
-              if (NULL == tsub[tsubSeq]) {
-                  taos_close(pThreadInfo->taos);
-                  return NULL;
-              }
-          }
-      }
+        tsubSeq = i - pThreadInfo->start_table_from;
+        taos_unsubscribe(tsub[tsubSeq], 0);
     }
-  }
-  taos_free_result(res);
 
-  for (uint64_t i = pThreadInfo->start_table_from;
-          i <= pThreadInfo->end_table_to; i++) {
-    tsubSeq = i - pThreadInfo->start_table_from;
-    taos_unsubscribe(tsub[tsubSeq], 0);
-  }
-
-  taos_close(pThreadInfo->taos);
-  return NULL;
+    taos_close(pThreadInfo->taos);
+    return NULL;
 }
 
 static void *specifiedSubscribe(void *sarg) {
@@ -7419,8 +7427,13 @@ static void *specifiedSubscribe(void *sarg) {
           || (g_queryInfo.specifiedQueryInfo.consumed[pThreadInfo->threadID] <
               g_queryInfo.specifiedQueryInfo.endAfterConsume[pThreadInfo->querySeq])) {
 
+      printf("consumed[%d]: %d, endAfterConsum[%"PRId64"]: %d\n",
+              pThreadInfo->threadID,
+              g_queryInfo.specifiedQueryInfo.consumed[pThreadInfo->threadID],
+              pThreadInfo->querySeq,
+              g_queryInfo.specifiedQueryInfo.endAfterConsume[pThreadInfo->querySeq]);
       if (ASYNC_MODE == g_queryInfo.specifiedQueryInfo.asyncMode) {
-        continue;
+          continue;
       }
 
       g_queryInfo.specifiedQueryInfo.res[pThreadInfo->threadID] = taos_consume(
@@ -7462,7 +7475,6 @@ static void *specifiedSubscribe(void *sarg) {
       }
   }
   taos_free_result(g_queryInfo.specifiedQueryInfo.res[pThreadInfo->threadID]);
-  taos_unsubscribe(g_queryInfo.specifiedQueryInfo.tsub[pThreadInfo->querySeq], 0);
   taos_close(pThreadInfo->taos);
 
   return NULL;
diff --git a/src/kit/taosdump/taosdump.c b/src/kit/taosdump/taosdump.c
index 05c6b1efbb..33118ce311 100644
--- a/src/kit/taosdump/taosdump.c
+++ b/src/kit/taosdump/taosdump.c
@@ -1126,7 +1126,7 @@ int taosGetTableDes(
     strncpy(tableDes->cols[count].field, (char *)row[TSDB_DESCRIBE_METRIC_FIELD_INDEX],
             fields[TSDB_DESCRIBE_METRIC_FIELD_INDEX].bytes);
     strncpy(tableDes->cols[count].type, (char *)row[TSDB_DESCRIBE_METRIC_TYPE_INDEX],
-            min(16, fields[TSDB_DESCRIBE_METRIC_TYPE_INDEX].bytes));
+            min(15, fields[TSDB_DESCRIBE_METRIC_TYPE_INDEX].bytes));
     tableDes->cols[count].length = *((int *)row[TSDB_DESCRIBE_METRIC_LENGTH_INDEX]);
     strncpy(tableDes->cols[count].note, (char *)row[TSDB_DESCRIBE_METRIC_NOTE_INDEX],
             fields[TSDB_DESCRIBE_METRIC_NOTE_INDEX].bytes);
diff --git a/src/mnode/src/mnodeDnode.c b/src/mnode/src/mnodeDnode.c
index e3feea7d3a..5a0743dd1b 100644
--- a/src/mnode/src/mnodeDnode.c
+++ b/src/mnode/src/mnodeDnode.c
@@ -16,7 +16,6 @@
 #define _DEFAULT_SOURCE
 #include "os.h"
 #include "tgrant.h"
-#include "tbn.h"
 #include "tglobal.h"
 #include "tconfig.h"
 #include "tutil.h"
@@ -632,7 +631,8 @@ static int32_t mnodeProcessDnodeStatusMsg(SMnodeMsg *pMsg) {
   }
 
   int32_t numOfMnodes = mnodeGetMnodesNum();
-  if (numOfMnodes < tsNumOfMnodes && numOfMnodes < mnodeGetOnlineDnodesNum() && !pDnode->isMgmt) {
+  if (numOfMnodes < tsNumOfMnodes && numOfMnodes < mnodeGetOnlineDnodesNum()
+      && bnDnodeCanCreateMnode(pDnode)) {
     bnNotify();
   }
 
diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 20edb02c38..189c4b6005 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -1068,7 +1068,7 @@ static int32_t mnodeProcessCreateSuperTableMsg(SMnodeMsg *pMsg) {
   pStable->info.tableId = strdup(pCreate->tableName);
   pStable->info.type    = TSDB_SUPER_TABLE;
   pStable->createdTime  = taosGetTimestampMs();
-  int64_t x = (us&0x000000FFFFFFFFFF);
+  uint64_t x = (us&0x000000FFFFFFFFFF);
   x = x<<24;
   pStable->uid          = x + ((sdbGetVersion() & ((1ul << 16) - 1ul)) << 8) + (taosRand() & ((1ul << 8) - 1ul));
   pStable->sversion     = 0;
@@ -2075,7 +2075,9 @@ static int32_t mnodeDoCreateChildTable(SMnodeMsg *pMsg, int32_t tid) {
   } else {
     if (pTable->info.type == TSDB_SUPER_TABLE) {
       int64_t us = taosGetTimestampUs();
-      pTable->uid = (us << 24) + ((sdbGetVersion() & ((1ul << 16) - 1ul)) << 8) + (taosRand() & ((1ul << 8) - 1ul));
+      uint64_t x = (us&0x000000FFFFFFFFFF);
+      x = x<<24;
+      pTable->uid = x + ((sdbGetVersion() & ((1ul << 16) - 1ul)) << 8) + (taosRand() & ((1ul << 8) - 1ul));
     } else {
       pTable->uid = (((uint64_t)pTable->vgId) << 48) + ((((uint64_t)pTable->tid) & ((1ul << 24) - 1ul)) << 24) +
                     ((sdbGetVersion() & ((1ul << 16) - 1ul)) << 8) + (taosRand() & ((1ul << 8) - 1ul));
diff --git a/src/os/inc/os.h b/src/os/inc/os.h
index 6731ca6d7d..903e80d5c7 100644
--- a/src/os/inc/os.h
+++ b/src/os/inc/os.h
@@ -29,7 +29,7 @@ extern "C" {
 #include "osMath.h"
 #include "osMemory.h"
 #include "osRand.h"
-#include "osSemphone.h"
+#include "osSemaphore.h"
 #include "osSignal.h"
 #include "osSleep.h"
 #include "osSocket.h"
diff --git a/src/os/inc/osSemphone.h b/src/os/inc/osSemaphore.h
similarity index 97%
rename from src/os/inc/osSemphone.h
rename to src/os/inc/osSemaphore.h
index fe59095205..10d14700e0 100644
--- a/src/os/inc/osSemphone.h
+++ b/src/os/inc/osSemaphore.h
@@ -13,8 +13,8 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef TDENGINE_OS_SEMPHONE_H
-#define TDENGINE_OS_SEMPHONE_H
+#ifndef TDENGINE_OS_SEMAPHORE_H
+#define TDENGINE_OS_SEMAPHORE_H
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/src/os/src/darwin/dwSemphone.c b/src/os/src/darwin/dwSemaphore.c
similarity index 100%
rename from src/os/src/darwin/dwSemphone.c
rename to src/os/src/darwin/dwSemaphore.c
diff --git a/src/os/src/detail/osSemphone.c b/src/os/src/detail/osSemaphore.c
similarity index 100%
rename from src/os/src/detail/osSemphone.c
rename to src/os/src/detail/osSemaphore.c
diff --git a/src/os/src/windows/wSemphone.c b/src/os/src/windows/wSemaphore.c
similarity index 100%
rename from src/os/src/windows/wSemphone.c
rename to src/os/src/windows/wSemaphore.c
diff --git a/src/plugins/http/src/httpGcJson.c b/src/plugins/http/src/httpGcJson.c
index 397791706d..f33a994465 100644
--- a/src/plugins/http/src/httpGcJson.c
+++ b/src/plugins/http/src/httpGcJson.c
@@ -228,13 +228,11 @@ bool gcBuildQueryJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result,
         case TSDB_DATA_TYPE_NCHAR:
           httpJsonStringForTransMean(jsonBuf, (char *)row[i], fields[i].bytes);
           break;
-        case TSDB_DATA_TYPE_TIMESTAMP:
-          if (precision == TSDB_TIME_PRECISION_MILLI) {  // ms
-            httpJsonInt64(jsonBuf, *((int64_t *)row[i]));
-          } else {
-            httpJsonInt64(jsonBuf, *((int64_t *)row[i]) / 1000);
-          }
+        case TSDB_DATA_TYPE_TIMESTAMP: {
+          int64_t ts = convertTimePrecision(*((int64_t *)row[i]), precision, TSDB_TIME_PRECISION_MILLI);
+          httpJsonInt64(jsonBuf, ts);
           break;
+        }
         default:
           httpJsonString(jsonBuf, "-", 1);
           break;
diff --git a/src/query/inc/qExecutor.h b/src/query/inc/qExecutor.h
index 1f1f9f3e60..8279c58b24 100644
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@@ -133,6 +133,28 @@ typedef struct STableQueryInfo {
   SResultRowInfo resInfo;
 } STableQueryInfo;
 
+typedef enum {
+  QUERY_PROF_BEFORE_OPERATOR_EXEC = 0,
+  QUERY_PROF_AFTER_OPERATOR_EXEC,
+  QUERY_PROF_QUERY_ABORT
+} EQueryProfEventType;
+
+typedef struct {
+  EQueryProfEventType eventType;
+  int64_t eventTime;
+
+  union {
+    uint8_t operatorType; //for operator event
+    int32_t abortCode; //for query abort event
+  };
+} SQueryProfEvent;
+
+typedef struct {
+  uint8_t operatorType;
+  int64_t sumSelfTime;
+  int64_t sumRunTimes;
+} SOperatorProfResult;
+
 typedef struct SQueryCostInfo {
   uint64_t loadStatisTime;
   uint64_t loadFileBlockTime;
@@ -154,6 +176,9 @@ typedef struct SQueryCostInfo {
   uint64_t tableInfoSize;
   uint64_t hashSize;
   uint64_t numOfTimeWindows;
+
+  SArray*   queryProfEvents;  //SArray<SQueryProfEvent>
+  SHashObj* operatorProfResults; //map<operator_type, SQueryProfEvent>
 } SQueryCostInfo;
 
 typedef struct {
@@ -192,6 +217,7 @@ typedef struct SQueryAttr {
   bool             needReverseScan;  // need reverse scan
   bool             distinctTag;      // distinct tag query
   bool             stateWindow;       // window State on sub/normal table
+  bool             createFilterOperator; // if filter operator is needed
   int32_t          interBufSize;     // intermediate buffer sizse
 
   int32_t          havingNum;        // having expr number
@@ -586,7 +612,12 @@ int32_t doDumpQueryResult(SQInfo *pQInfo, char *data);
 
 size_t getResultSize(SQInfo *pQInfo, int64_t *numOfRows);
 void setQueryKilled(SQInfo *pQInfo);
+
+void publishOperatorProfEvent(SOperatorInfo* operatorInfo, EQueryProfEventType eventType);
+void publishQueryAbortEvent(SQInfo* pQInfo, int32_t code);
+void calculateOperatorProfResults(SQInfo* pQInfo);
 void queryCostStatis(SQInfo *pQInfo);
+
 void freeQInfo(SQInfo *pQInfo);
 void freeQueryAttr(SQueryAttr *pQuery);
 
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 6138d9deb3..5989bd810b 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -16,6 +16,7 @@
 #include "qFill.h"
 #include "taosmsg.h"
 #include "tglobal.h"
+#include "talgo.h"
 
 #include "exception.h"
 #include "hash.h"
@@ -26,6 +27,7 @@
 #include "queryLog.h"
 #include "tlosertree.h"
 #include "ttype.h"
+#include "tcompare.h"
 #include "tscompression.h"
 
 #define IS_MASTER_SCAN(runtime)        ((runtime)->scanFlag == MASTER_SCAN)
@@ -207,7 +209,66 @@ static void doSetTableGroupOutputBuf(SQueryRuntimeEnv* pRuntimeEnv, SResultRowIn
                                      SQLFunctionCtx* pCtx, int32_t* rowCellInfoOffset, int32_t numOfOutput,
                                      int32_t groupIndex);
 
-// setup the output buffer for each operator
+SArray* getOrderCheckColumns(SQueryAttr* pQuery);
+
+
+typedef struct SRowCompSupporter {
+  SQueryRuntimeEnv *pRuntimeEnv; 
+  int16_t           dataOffset;
+  __compar_fn_t     comFunc; 
+} SRowCompSupporter;
+
+static int compareRowData(const void *a, const void *b, const void *userData) {
+  const SResultRow *pRow1 = (const SResultRow *)a; 
+  const SResultRow *pRow2 = (const SResultRow *)b;
+
+  SRowCompSupporter *supporter  = (SRowCompSupporter *)userData; 
+  SQueryRuntimeEnv* pRuntimeEnv =  supporter->pRuntimeEnv;   
+  
+  tFilePage *page1 = getResBufPage(pRuntimeEnv->pResultBuf, pRow1->pageId);
+  tFilePage *page2 = getResBufPage(pRuntimeEnv->pResultBuf, pRow2->pageId);
+
+  int16_t offset = supporter->dataOffset; 
+  char *in1  = getPosInResultPage(pRuntimeEnv->pQueryAttr, page1, pRow1->offset, offset);
+  char *in2  = getPosInResultPage(pRuntimeEnv->pQueryAttr, page2, pRow2->offset, offset);   
+
+  return (in1 != NULL && in2 != NULL) ? supporter->comFunc(in1, in2) : 0;
+}
+
+static void sortGroupResByOrderList(SGroupResInfo *pGroupResInfo, SQueryRuntimeEnv *pRuntimeEnv, SSDataBlock* pDataBlock) {
+  SArray *columnOrderList = getOrderCheckColumns(pRuntimeEnv->pQueryAttr);
+  if (taosArrayGetSize(columnOrderList) <= 0) {
+    return;
+  }
+  int32_t orderId = pRuntimeEnv->pQueryAttr->order.orderColId;
+  if (orderId <= 0) {
+    return;
+  } 
+  bool found = false;
+  int16_t dataOffset = 0;
+   
+  //SColIndex *index = taosArrayGet(columnOrderList, 0);
+  for (int32_t j = 0; j < pDataBlock->info.numOfCols; ++j) {
+    SColumnInfoData* pColInfoData = (SColumnInfoData *)taosArrayGet(pDataBlock->pDataBlock, j);
+    if (orderId == j) {
+      found = true;
+      break;
+    }
+    dataOffset += pColInfoData->info.bytes;
+  }  
+
+  if (found == false) {
+    return;
+  }
+  int16_t type = pRuntimeEnv->pQueryAttr->pExpr1[orderId].base.resType;
+   
+  SRowCompSupporter support = {.pRuntimeEnv = pRuntimeEnv, .dataOffset = dataOffset, .comFunc = getComparFunc(type, 0)};  
+   
+  taosArraySortPWithExt(pGroupResInfo->pRows, compareRowData, &support);
+  return;
+  
+}
+//setup the output buffer for each operator
 SSDataBlock* createOutputBuf(SExprInfo* pExpr, int32_t numOfOutput, int32_t numOfRows) {
   const static int32_t minSize = 8;
 
@@ -3785,6 +3846,103 @@ int32_t doFillTimeIntervalGapsInResults(SFillInfo* pFillInfo, SSDataBlock *pOutp
   return pOutput->info.rows;
 }
 
+void publishOperatorProfEvent(SOperatorInfo* operatorInfo, EQueryProfEventType eventType) {
+  SQueryProfEvent event;
+  event.eventType = eventType;
+  event.eventTime = taosGetTimestampUs();
+  event.operatorType = operatorInfo->operatorType;
+
+  SQInfo* qInfo = operatorInfo->pRuntimeEnv->qinfo;
+  if (qInfo->summary.queryProfEvents) {
+    taosArrayPush(qInfo->summary.queryProfEvents, &event);
+  }
+}
+
+void publishQueryAbortEvent(SQInfo* pQInfo, int32_t code) {
+  SQueryProfEvent event;
+  event.eventType = QUERY_PROF_QUERY_ABORT;
+  event.eventTime = taosGetTimestampUs();
+  event.abortCode = code;
+
+  if (pQInfo->summary.queryProfEvents) {
+    taosArrayPush(pQInfo->summary.queryProfEvents, &event);
+  }
+}
+
+typedef struct  {
+  uint8_t operatorType;
+  int64_t beginTime;
+  int64_t endTime;
+  int64_t selfTime;
+  int64_t descendantsTime;
+} SOperatorStackItem;
+
+static void doOperatorExecProfOnce(SOperatorStackItem* item, SQueryProfEvent* event, SArray* opStack, SHashObj* profResults) {
+  item->endTime = event->eventTime;
+  item->selfTime = (item->endTime - item->beginTime) - (item->descendantsTime);
+
+  for (int32_t j = 0; j < taosArrayGetSize(opStack); ++j) {
+    SOperatorStackItem* ancestor = taosArrayGet(opStack, j);
+    ancestor->descendantsTime += item->selfTime;
+  }
+
+  uint8_t operatorType = item->operatorType;
+  SOperatorProfResult* result = taosHashGet(profResults, &operatorType, sizeof(operatorType));
+  if (result != NULL) {
+    result->sumRunTimes++;
+    result->sumSelfTime += item->selfTime;
+  } else {
+    SOperatorProfResult opResult;
+    opResult.operatorType = operatorType;
+    opResult.sumSelfTime = item->selfTime;
+    opResult.sumRunTimes = 1;
+    taosHashPut(profResults, &(operatorType), sizeof(operatorType),
+                &opResult, sizeof(opResult));
+  }
+}
+
+void calculateOperatorProfResults(SQInfo* pQInfo) {
+  if (pQInfo->summary.queryProfEvents == NULL) {
+    qDebug("QInfo:0x%"PRIx64" query prof events array is null", pQInfo->qId);
+    return;
+  }
+
+  if (pQInfo->summary.operatorProfResults == NULL) {
+    qDebug("QInfo:0x%"PRIx64" operator prof results hash is null", pQInfo->qId);
+    return;
+  }
+  
+  SArray* opStack = taosArrayInit(32, sizeof(SOperatorStackItem));
+  if (opStack == NULL) {
+    return;
+  }
+
+  size_t size = taosArrayGetSize(pQInfo->summary.queryProfEvents);
+  SHashObj* profResults = pQInfo->summary.operatorProfResults;
+
+  for (int i = 0; i < size; ++i) {
+    SQueryProfEvent* event = taosArrayGet(pQInfo->summary.queryProfEvents, i);
+    if (event->eventType == QUERY_PROF_BEFORE_OPERATOR_EXEC) {
+      SOperatorStackItem opItem;
+      opItem.operatorType = event->operatorType;
+      opItem.beginTime = event->eventTime;
+      opItem.descendantsTime = 0;
+      taosArrayPush(opStack, &opItem);
+    } else if (event->eventType == QUERY_PROF_AFTER_OPERATOR_EXEC) {
+      SOperatorStackItem* item = taosArrayPop(opStack);
+      assert(item->operatorType == event->operatorType);
+      doOperatorExecProfOnce(item, event, opStack, profResults);
+    } else if (event->eventType == QUERY_PROF_QUERY_ABORT) {
+      SOperatorStackItem* item;
+      while ((item = taosArrayPop(opStack)) != NULL) {
+        doOperatorExecProfOnce(item, event, opStack, profResults);
+      }
+    }
+  }
+
+  taosArrayDestroy(opStack);
+}
+
 void queryCostStatis(SQInfo *pQInfo) {
   SQueryRuntimeEnv *pRuntimeEnv = &pQInfo->runtimeEnv;
   SQueryCostInfo *pSummary = &pQInfo->summary;
@@ -3805,6 +3963,8 @@ void queryCostStatis(SQInfo *pQInfo) {
     pSummary->numOfTimeWindows = 0;
   }
 
+  calculateOperatorProfResults(pQInfo);
+
   qDebug("QInfo:0x%"PRIx64" :cost summary: elapsed time:%"PRId64" us, first merge:%"PRId64" us, total blocks:%d, "
          "load block statis:%d, load data block:%d, total rows:%"PRId64 ", check rows:%"PRId64,
          pQInfo->qId, pSummary->elapsedTime, pSummary->firstStageMergeTime, pSummary->totalBlocks, pSummary->loadBlockStatis,
@@ -3812,6 +3972,15 @@ void queryCostStatis(SQInfo *pQInfo) {
 
   qDebug("QInfo:0x%"PRIx64" :cost summary: winResPool size:%.2f Kb, numOfWin:%"PRId64", tableInfoSize:%.2f Kb, hashTable:%.2f Kb", pQInfo->qId, pSummary->winInfoSize/1024.0,
       pSummary->numOfTimeWindows, pSummary->tableInfoSize/1024.0, pSummary->hashSize/1024.0);
+
+  if (pSummary->operatorProfResults) {
+    SOperatorProfResult* opRes = taosHashIterate(pSummary->operatorProfResults, NULL);
+    while (opRes != NULL) {
+      qDebug("QInfo:0x%" PRIx64 " :cost summary: operator : %d, exec times: %" PRId64 ", self time: %" PRId64,
+             pQInfo->qId, opRes->operatorType, opRes->sumRunTimes, opRes->sumSelfTime);
+      opRes = taosHashIterate(pSummary->operatorProfResults, opRes);
+    }
+  }
 }
 
 //static void updateOffsetVal(SQueryRuntimeEnv *pRuntimeEnv, SDataBlockInfo *pBlockInfo) {
@@ -4213,6 +4382,15 @@ int32_t doInitQInfo(SQInfo* pQInfo, STSBuf* pTsBuf, void* tsdb, void* sourceOptr
   // create runtime environment
   int32_t numOfTables = (int32_t)pQueryAttr->tableGroupInfo.numOfTables;
   pQInfo->summary.tableInfoSize += (numOfTables * sizeof(STableQueryInfo));
+  pQInfo->summary.queryProfEvents = taosArrayInit(512, sizeof(SQueryProfEvent));
+  if (pQInfo->summary.queryProfEvents == NULL) {
+    qDebug("QInfo:0x%"PRIx64" failed to allocate query prof events array", pQInfo->qId);
+  }
+  pQInfo->summary.operatorProfResults =
+      taosHashInit(8, taosGetDefaultHashFunction(TSDB_DATA_TYPE_TINYINT), true, HASH_NO_LOCK);
+  if (pQInfo->summary.operatorProfResults == NULL) {
+    qDebug("QInfo:0x%"PRIx64" failed to allocate operator prof results hash", pQInfo->qId);
+  }
 
   code = setupQueryRuntimeEnv(pRuntimeEnv, (int32_t) pQueryAttr->tableGroupInfo.numOfTables, pOperator, param);
   if (code != TSDB_CODE_SUCCESS) {
@@ -4837,7 +5015,10 @@ static SSDataBlock* doAggregate(void* param, bool* newgroup) {
   SOperatorInfo* upstream = pOperator->upstream[0];
 
   while(1) {
+    publishOperatorProfEvent(upstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = upstream->exec(upstream, newgroup);
+    publishOperatorProfEvent(upstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       break;
     }
@@ -4892,7 +5073,10 @@ static SSDataBlock* doSTableAggregate(void* param, bool* newgroup) {
   SOperatorInfo* upstream = pOperator->upstream[0];
 
   while(1) {
+    publishOperatorProfEvent(upstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = upstream->exec(upstream, newgroup);
+    publishOperatorProfEvent(upstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       break;
     }
@@ -4972,7 +5156,10 @@ static SSDataBlock* doProjectOperation(void* param, bool* newgroup) {
     bool prevVal = *newgroup;
 
     // The upstream exec may change the value of the newgroup, so use a local variable instead.
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       assert(*newgroup == false);
 
@@ -5032,7 +5219,10 @@ static SSDataBlock* doLimit(void* param, bool* newgroup) {
 
   SSDataBlock* pBlock = NULL;
   while (1) {
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
     pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
       pOperator->status = OP_EXEC_DONE;
@@ -5082,7 +5272,10 @@ static SSDataBlock* doFilter(void* param, bool* newgroup) {
   SQueryRuntimeEnv* pRuntimeEnv = pOperator->pRuntimeEnv;
 
   while (1) {
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock *pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       break;
     }
@@ -5127,7 +5320,10 @@ static SSDataBlock* doIntervalAgg(void* param, bool* newgroup) {
   SOperatorInfo* upstream = pOperator->upstream[0];
 
   while(1) {
+    publishOperatorProfEvent(upstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = upstream->exec(upstream, newgroup);
+    publishOperatorProfEvent(upstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       break;
     }
@@ -5180,7 +5376,10 @@ static SSDataBlock* doSTableIntervalAgg(void* param, bool* newgroup) {
   SOperatorInfo* upstream = pOperator->upstream[0];
 
   while(1) {
+    publishOperatorProfEvent(upstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = upstream->exec(upstream, newgroup);
+    publishOperatorProfEvent(upstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       break;
     }
@@ -5308,7 +5507,10 @@ static SSDataBlock* doStateWindowAgg(void *param, bool* newgroup) {
   STimeWindow win = pQueryAttr->window;
   SOperatorInfo* upstream = pOperator->upstream[0];
   while (1) {
+    publishOperatorProfEvent(upstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = upstream->exec(upstream, newgroup);
+    publishOperatorProfEvent(upstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       break;
     }
@@ -5366,7 +5568,9 @@ static SSDataBlock* doSessionWindowAgg(void* param, bool* newgroup) {
   SOperatorInfo* upstream = pOperator->upstream[0];
 
   while(1) {
+    publishOperatorProfEvent(upstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = upstream->exec(upstream, newgroup);
+    publishOperatorProfEvent(upstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
     if (pBlock == NULL) {
       break;
     }
@@ -5417,7 +5621,9 @@ static SSDataBlock* hashGroupbyAggregate(void* param, bool* newgroup) {
   SOperatorInfo* upstream = pOperator->upstream[0];
 
   while(1) {
+    publishOperatorProfEvent(upstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = upstream->exec(upstream, newgroup);
+    publishOperatorProfEvent(upstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
     if (pBlock == NULL) {
       break;
     }
@@ -5443,8 +5649,11 @@ static SSDataBlock* hashGroupbyAggregate(void* param, bool* newgroup) {
   }
 
   initGroupResInfo(&pRuntimeEnv->groupResInfo, &pInfo->binfo.resultRowInfo);
+  if (!pRuntimeEnv->pQueryAttr->stableQuery) {
+    sortGroupResByOrderList(&pRuntimeEnv->groupResInfo, pRuntimeEnv, pInfo->binfo.pRes);
+  }
   toSSDataBlock(&pRuntimeEnv->groupResInfo, pRuntimeEnv, pInfo->binfo.pRes);
-
+  
   if (pInfo->binfo.pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pRuntimeEnv->groupResInfo)) {
     pOperator->status = OP_EXEC_DONE;
   }
@@ -5483,7 +5692,10 @@ static SSDataBlock* doFill(void* param, bool* newgroup) {
   }
 
   while(1) {
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
     SSDataBlock* pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (*newgroup) {
       assert(pBlock != NULL);
     }
@@ -6153,7 +6365,10 @@ static SSDataBlock* hashDistinct(void* param, bool* newgroup) {
   pRes->info.rows = 0;
   SSDataBlock* pBlock = NULL;
   while(1) {
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_BEFORE_OPERATOR_EXEC);
     pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+    publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
+
     if (pBlock == NULL) {
       setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
       pOperator->status = OP_EXEC_DONE;
@@ -7039,6 +7254,8 @@ int32_t createFilterInfo(SQueryAttr* pQueryAttr, uint64_t qId) {
   doCreateFilterInfo(pQueryAttr->tableCols, pQueryAttr->numOfCols, pQueryAttr->numOfFilterCols,
                      &pQueryAttr->pFilterInfo, qId);
 
+  pQueryAttr->createFilterOperator = true;
+
   return TSDB_CODE_SUCCESS;
 }
 
@@ -7477,6 +7694,9 @@ void freeQInfo(SQInfo *pQInfo) {
   tfree(pQInfo->pBuf);
   tfree(pQInfo->sql);
 
+  taosArrayDestroy(pQInfo->summary.queryProfEvents);
+  taosHashCleanup(pQInfo->summary.operatorProfResults);
+
   taosArrayDestroy(pRuntimeEnv->groupResInfo.pRows);
   pQInfo->signature = 0;
 
diff --git a/src/query/src/qPlan.c b/src/query/src/qPlan.c
index 214ef32cd4..9c06a87b81 100644
--- a/src/query/src/qPlan.c
+++ b/src/query/src/qPlan.c
@@ -623,7 +623,7 @@ SArray* createExecOperatorPlan(SQueryAttr* pQueryAttr) {
       taosArrayPush(plan, &op);
     }
   } else {  // diff/add/multiply/subtract/division
-    if (pQueryAttr->numOfFilterCols > 0 && pQueryAttr->vgId == 0) { // todo refactor
+    if (pQueryAttr->numOfFilterCols > 0 && pQueryAttr->createFilterOperator && pQueryAttr->vgId == 0) { // todo refactor
       op = OP_Filter;
       taosArrayPush(plan, &op);
     } else {
diff --git a/src/query/src/queryMain.c b/src/query/src/queryMain.c
index 38ef81e793..787cb2f7d1 100644
--- a/src/query/src/queryMain.c
+++ b/src/query/src/queryMain.c
@@ -232,6 +232,7 @@ bool qTableQuery(qinfo_t qinfo, uint64_t *qId) {
   // error occurs, record the error code and return to client
   int32_t ret = setjmp(pQInfo->runtimeEnv.env);
   if (ret != TSDB_CODE_SUCCESS) {
+    publishQueryAbortEvent(pQInfo, ret);
     pQInfo->code = ret;
     qDebug("QInfo:0x%"PRIx64" query abort due to error/cancel occurs, code:%s", pQInfo->qId, tstrerror(pQInfo->code));
     return doBuildResCheck(pQInfo);
@@ -240,7 +241,9 @@ bool qTableQuery(qinfo_t qinfo, uint64_t *qId) {
   qDebug("QInfo:0x%"PRIx64" query task is launched", pQInfo->qId);
 
   bool newgroup = false;
+  publishOperatorProfEvent(pRuntimeEnv->proot, QUERY_PROF_BEFORE_OPERATOR_EXEC);
   pRuntimeEnv->outputBuf = pRuntimeEnv->proot->exec(pRuntimeEnv->proot, &newgroup);
+  publishOperatorProfEvent(pRuntimeEnv->proot, QUERY_PROF_AFTER_OPERATOR_EXEC);
   pRuntimeEnv->resultInfo.total += GET_NUM_OF_RESULTS(pRuntimeEnv);
 
   if (isQueryKilled(pQInfo)) {
diff --git a/src/util/inc/tarray.h b/src/util/inc/tarray.h
index fc7b6b8584..63cadf39a3 100644
--- a/src/util/inc/tarray.h
+++ b/src/util/inc/tarray.h
@@ -197,8 +197,21 @@ void* taosArraySearch(const SArray* pArray, const void* key, __compar_fn_t compa
  */
 char* taosArraySearchString(const SArray* pArray, const char* key, __compar_fn_t comparFn, int flags);
 
+
+/**
+ * sort the pointer data in the array
+ * @param pArray
+ * @param compar 
+ * @param param  
+ * @return
+ */
+
+void taosArraySortPWithExt(SArray* pArray, __ext_compar_fn_t fn, const void *param);
+
 #ifdef __cplusplus
 }
 #endif
 
+
+
 #endif  // TDENGINE_TAOSARRAY_H
diff --git a/src/util/inc/tsched.h b/src/util/inc/tsched.h
index 3e481cbc32..a1591512c1 100644
--- a/src/util/inc/tsched.h
+++ b/src/util/inc/tsched.h
@@ -28,10 +28,41 @@ typedef struct SSchedMsg {
   void *thandle;
 } SSchedMsg;
 
-void *taosInitScheduler(int queueSize, int numOfThreads, const char *label);
-void *taosInitSchedulerWithInfo(int queueSize, int numOfThreads, const char *label, void *tmrCtrl);
-int  taosScheduleTask(void *qhandle, SSchedMsg *pMsg);
-void taosCleanUpScheduler(void *param);
+/**
+ * Create a thread-safe ring-buffer based task queue and return the instance. A thread
+ * pool will be created to consume the messages in the queue.
+ * @param capacity the queue capacity
+ * @param numOfThreads the number of threads for the thread pool
+ * @param label the label of the queue
+ * @return the created queue scheduler
+ */
+void *taosInitScheduler(int capacity, int numOfThreads, const char *label);
+
+/**
+ * Create a thread-safe ring-buffer based task queue and return the instance.
+ * Same as taosInitScheduler, and it also print the queue status every 1 minite.
+ * @param capacity the queue capacity
+ * @param numOfThreads the number of threads for the thread pool
+ * @param label the label of the queue
+ * @param tmrCtrl the timer controller, tmr_ctrl_t*
+ * @return the created queue scheduler
+ */
+void *taosInitSchedulerWithInfo(int capacity, int numOfThreads, const char *label, void *tmrCtrl);
+
+/**
+ * Clean up the queue scheduler instance and free the memory.
+ * @param queueScheduler the queue scheduler to free
+ */
+void taosCleanUpScheduler(void *queueScheduler);
+
+/**
+ * Schedule a new task to run, the task is described by pMsg.
+ * The function may be blocked if no thread is available to execute the task.
+ * That may happen when all threads are busy.
+ * @param queueScheduler the queue scheduler instance
+ * @param pMsg the message for the task
+ */
+void taosScheduleTask(void *queueScheduler, SSchedMsg *pMsg);
 
 #ifdef __cplusplus
 }
diff --git a/src/util/src/tarray.c b/src/util/src/tarray.c
index 5e7d9d14da..fe529edaac 100644
--- a/src/util/src/tarray.c
+++ b/src/util/src/tarray.c
@@ -15,6 +15,7 @@
 
 #include "os.h"
 #include "tarray.h"
+#include "talgo.h"
 
 void* taosArrayInit(size_t size, size_t elemSize) {
   assert(elemSize > 0);
@@ -249,4 +250,62 @@ char* taosArraySearchString(const SArray* pArray, const char* key, __compar_fn_t
     return NULL;
   }
   return *(char**)p;
-}
\ No newline at end of file
+}
+
+static int taosArrayPartition(SArray *pArray, int i, int j, __ext_compar_fn_t fn, const void *userData) {
+  void* key = taosArrayGetP(pArray, i);  
+  while (i < j) {
+    while (i < j && fn(taosArrayGetP(pArray, j), key, userData) >= 0) { j--; }
+    if (i < j) { 
+      void *a = taosArrayGetP(pArray, j); 
+      taosArraySet(pArray, i, &a);
+    }
+    while (i < j && fn(taosArrayGetP(pArray, i), key, userData) <= 0) { i++;} 
+    if (i < j) {
+      void *a = taosArrayGetP(pArray, i);
+      taosArraySet(pArray, j, &a);
+    }
+  }
+  taosArraySet(pArray, i, &key); 
+  return i;
+}
+
+static void taosArrayQuicksortHelper(SArray *pArray, int low, int high, __ext_compar_fn_t fn, const void *param) {
+  if (low < high) {
+    int idx = taosArrayPartition(pArray, low, high, fn, param);
+    taosArrayQuicksortHelper(pArray, low, idx - 1, fn, param);
+    taosArrayQuicksortHelper(pArray, idx + 1, high, fn, param);
+  } 
+}
+
+static void taosArrayQuickSort(SArray* pArray, __ext_compar_fn_t fn, const void *param) {
+  if (pArray->size <= 1) {
+    return;
+  } 
+  taosArrayQuicksortHelper(pArray, 0, (int)(taosArrayGetSize(pArray) - 1),  fn, param); 
+}
+static void taosArrayInsertSort(SArray* pArray, __ext_compar_fn_t fn, const void *param) {
+  if (pArray->size <= 1) {
+    return;
+  } 
+  for (int i = 1; i <= pArray->size - 1; ++i) {
+    for (int j = i; j > 0; --j) {
+      if (fn(taosArrayGetP(pArray, j), taosArrayGetP(pArray, j - 1), param) == -1) {
+        void *a = taosArrayGetP(pArray, j);  
+        void *b = taosArrayGetP(pArray, j - 1);
+        taosArraySet(pArray, j - 1, &a);
+        taosArraySet(pArray, j, &b);
+      } else {
+        break;
+      }
+    }
+  }
+  return;
+   
+} 
+// order array<type *>  
+void taosArraySortPWithExt(SArray* pArray, __ext_compar_fn_t fn, const void *param) {
+  taosArrayGetSize(pArray) > 8 ? 
+    taosArrayQuickSort(pArray, fn, param) : taosArrayInsertSort(pArray, fn, param);
+}
+//TODO(yihaoDeng) add order array<type> 
diff --git a/src/util/src/tsched.c b/src/util/src/tsched.c
index f014dd0fab..16142470c9 100644
--- a/src/util/src/tsched.c
+++ b/src/util/src/tsched.c
@@ -108,39 +108,47 @@ void *taosInitScheduler(int queueSize, int numOfThreads, const char *label) {
 
 void *taosInitSchedulerWithInfo(int queueSize, int numOfThreads, const char *label, void *tmrCtrl) {
   SSchedQueue* pSched = taosInitScheduler(queueSize, numOfThreads, label);
-  
+
   if (tmrCtrl != NULL && pSched != NULL) {
     pSched->pTmrCtrl = tmrCtrl;
     taosTmrReset(taosDumpSchedulerStatus, DUMP_SCHEDULER_TIME_WINDOW, pSched, pSched->pTmrCtrl, &pSched->pTimer);
   }
-  
+
   return pSched;
 }
 
-void *taosProcessSchedQueue(void *param) {
+void *taosProcessSchedQueue(void *scheduler) {
   SSchedMsg    msg;
-  SSchedQueue *pSched = (SSchedQueue *)param;
+  SSchedQueue *pSched = (SSchedQueue *)scheduler;
+  int ret = 0;
 
   while (1) {
-    if (tsem_wait(&pSched->fullSem) != 0) {
-      uError("wait %s fullSem failed(%s)", pSched->label, strerror(errno));
+    if ((ret = tsem_wait(&pSched->fullSem)) != 0) {
+      uFatal("wait %s fullSem failed(%s)", pSched->label, strerror(errno));
+      exit(ret);
     }
     if (pSched->stop) {
       break;
     }
 
-    if (pthread_mutex_lock(&pSched->queueMutex) != 0)
-      uError("lock %s queueMutex failed(%s)", pSched->label, strerror(errno));
+    if ((ret = pthread_mutex_lock(&pSched->queueMutex)) != 0) {
+      uFatal("lock %s queueMutex failed(%s)", pSched->label, strerror(errno));
+      exit(ret);
+    }
 
     msg = pSched->queue[pSched->fullSlot];
     memset(pSched->queue + pSched->fullSlot, 0, sizeof(SSchedMsg));
     pSched->fullSlot = (pSched->fullSlot + 1) % pSched->queueSize;
 
-    if (pthread_mutex_unlock(&pSched->queueMutex) != 0)
-      uError("unlock %s queueMutex failed(%s)", pSched->label, strerror(errno));
+    if ((ret = pthread_mutex_unlock(&pSched->queueMutex)) != 0) {
+      uFatal("unlock %s queueMutex failed(%s)", pSched->label, strerror(errno));
+      exit(ret);
+    }
 
-    if (tsem_post(&pSched->emptySem) != 0)
-      uError("post %s emptySem failed(%s)", pSched->label, strerror(errno));
+    if ((ret = tsem_post(&pSched->emptySem)) != 0) {
+      uFatal("post %s emptySem failed(%s)", pSched->label, strerror(errno));
+      exit(ret);
+    }
 
     if (msg.fp)
       (*(msg.fp))(&msg);
@@ -151,30 +159,37 @@ void *taosProcessSchedQueue(void *param) {
   return NULL;
 }
 
-int taosScheduleTask(void *qhandle, SSchedMsg *pMsg) {
-  SSchedQueue *pSched = (SSchedQueue *)qhandle;
+void taosScheduleTask(void *queueScheduler, SSchedMsg *pMsg) {
+  SSchedQueue *pSched = (SSchedQueue *)queueScheduler;
+  int ret = 0;
+
   if (pSched == NULL) {
     uError("sched is not ready, msg:%p is dropped", pMsg);
-    return 0;
+    return;
   }
 
-  if (tsem_wait(&pSched->emptySem) != 0) {
-    uError("wait %s emptySem failed(%s)", pSched->label, strerror(errno));
+  if ((ret = tsem_wait(&pSched->emptySem)) != 0) {
+    uFatal("wait %s emptySem failed(%s)", pSched->label, strerror(errno));
+    exit(ret);
   }
 
-  if (pthread_mutex_lock(&pSched->queueMutex) != 0)
-    uError("lock %s queueMutex failed(%s)", pSched->label, strerror(errno));
+  if ((ret = pthread_mutex_lock(&pSched->queueMutex)) != 0) {
+    uFatal("lock %s queueMutex failed(%s)", pSched->label, strerror(errno));
+    exit(ret);
+  }
 
   pSched->queue[pSched->emptySlot] = *pMsg;
   pSched->emptySlot = (pSched->emptySlot + 1) % pSched->queueSize;
 
-  if (pthread_mutex_unlock(&pSched->queueMutex) != 0)
-    uError("unlock %s queueMutex failed(%s)", pSched->label, strerror(errno));
+  if ((ret = pthread_mutex_unlock(&pSched->queueMutex)) != 0) {
+    uFatal("unlock %s queueMutex failed(%s)", pSched->label, strerror(errno));
+    exit(ret);
+  }
 
-  if (tsem_post(&pSched->fullSem) != 0) 
-    uError("post %s fullSem failed(%s)", pSched->label, strerror(errno));
-
-  return 0;
+  if ((ret = tsem_post(&pSched->fullSem)) != 0) {
+    uFatal("post %s fullSem failed(%s)", pSched->label, strerror(errno));
+    exit(ret);
+  }
 }
 
 void taosCleanUpScheduler(void *param) {
@@ -219,4 +234,4 @@ void taosDumpSchedulerStatus(void *qhandle, void *tmrId) {
   }
   
   taosTmrReset(taosDumpSchedulerStatus, DUMP_SCHEDULER_TIME_WINDOW, pSched, pSched->pTmrCtrl, &pSched->pTimer);
-}
+}
\ No newline at end of file
diff --git a/tests/pytest/dockerCluster/OneMnodeMultipleVnodesTest.py b/tests/pytest/dockerCluster/OneMnodeMultipleVnodesTest.py
index ee663f89b0..43e281f437 100644
--- a/tests/pytest/dockerCluster/OneMnodeMultipleVnodesTest.py
+++ b/tests/pytest/dockerCluster/OneMnodeMultipleVnodesTest.py
@@ -12,9 +12,6 @@
 # -*- coding: utf-8 -*-
 
 from basic import *
-from util.sql import tdSql
-
-
 
 class TDTestCase:
 
@@ -36,4 +33,6 @@ td = TDTestCase()
 td.init()
 
 
+## usage:  python3 OneMnodeMultipleVnodesTest.py 
+
 
diff --git a/tests/pytest/dockerCluster/basic.py b/tests/pytest/dockerCluster/basic.py
index 50914b0be9..871d69790d 100644
--- a/tests/pytest/dockerCluster/basic.py
+++ b/tests/pytest/dockerCluster/basic.py
@@ -44,7 +44,16 @@ class BuildDockerCluser:
             "jnidebugFlag":"135",
             "qdebugFlag":"135",
             "maxSQLLength":"1048576"
-        }     
+        }
+        cmd = "mkdir -p %s" % self.dockerDir
+        self.execCmd(cmd)
+
+        cmd = "cp *.yml %s" % self.dockerDir
+        self.execCmd(cmd)
+
+        cmd = "cp Dockerfile %s" % self.dockerDir
+        self.execCmd(cmd)
+
 
     # execute command, and return the output 
     # ref: https://blog.csdn.net/wowocpp/article/details/80775650  
@@ -81,7 +90,7 @@ class BuildDockerCluser:
     def removeFile(self, rootDir, index, dir):
         cmd = "rm -rf %s/node%d/%s/*" % (rootDir, index, dir)        
         self.execCmd(cmd)
-
+    
     def clearEnv(self):
         cmd = "cd %s && docker-compose down --remove-orphans" % self.dockerDir
         self.execCmd(cmd)
@@ -108,10 +117,14 @@ class BuildDockerCluser:
         self.execCmd(cmd)
     
     def updateLocalhosts(self):
-        cmd = "grep '172.27.0.7 *tdnode1' /etc/hosts"
+        cmd = "grep '172.27.0.7 *tdnode1' /etc/hosts | sed 's: ::g'"
         result = self.execCmdAndGetOutput(cmd)
-        if result and not result.isspace():
+        print(result)
+        if result is None or result.isspace():
+            print("==========")
             cmd = "echo '172.27.0.7 tdnode1' >> /etc/hosts"
+            display = "echo %s" % cmd
+            self.execCmd(display)
             self.execCmd(cmd)
     
     def deploy(self):
@@ -138,13 +151,13 @@ class BuildDockerCluser:
         if self.numOfNodes < 2 or self.numOfNodes > 10:
             print("the number of nodes must be between 2 and 10")
             exit(0)
-        self.clearEnv()
-        self.createDirs()
         self.updateLocalhosts()
         self.deploy()
 
     def run(self):           
-        cmd = "./buildClusterEnv.sh -n %d -v %s -d %s" % (self.numOfNodes, self.getTaosdVersion(), self.dockerDir)        
+        cmd = "./buildClusterEnv.sh -n %d -v %s -d %s" % (self.numOfNodes, self.getTaosdVersion(), self.dockerDir)
+        display = "echo %s" % cmd
+        self.execCmd(display)
         self.execCmd(cmd)
         self.getConnection()
         self.createDondes()
diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index c66ccc5477..17d0bbe190 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -150,6 +150,7 @@ python3 ./test.py -f import_merge/importCSV.py
 #======================p2-start===============
 # tools
 python3 test.py -f tools/taosdumpTest.py
+python3 test.py -f tools/taosdumpTest2.py
 
 python3 test.py -f tools/taosdemoTest.py
 python3 test.py -f tools/taosdemoTestWithoutMetric.py
@@ -333,6 +334,7 @@ python3 ./test.py -f insert/unsignedInt.py
 python3 ./test.py -f insert/unsignedBigint.py
 python3 ./test.py -f insert/unsignedSmallint.py
 python3 ./test.py -f insert/unsignedTinyint.py
+python3 ./test.py -f insert/insertFromCSV.py
 python3 ./test.py -f query/filterAllUnsignedIntTypes.py
 
 python3 ./test.py -f tag_lite/unsignedInt.py
diff --git a/tests/pytest/insert/insertFromCSVOurofOrder.py b/tests/pytest/insert/insertFromCSV.py
similarity index 59%
rename from tests/pytest/insert/insertFromCSVOurofOrder.py
rename to tests/pytest/insert/insertFromCSV.py
index d4de85b7e9..c5d3648569 100644
--- a/tests/pytest/insert/insertFromCSVOurofOrder.py
+++ b/tests/pytest/insert/insertFromCSV.py
@@ -28,16 +28,15 @@ class TDTestCase:
         tdLog.debug("start to execute %s" % __file__)
         tdSql.init(conn.cursor(), logSql)
 
-        self.ts = 1500074556514                  
+        self.ts = 1500074556514
+        self.csvfile = "/tmp/csvfile.csv"
+        self.rows = 100000
     
     def writeCSV(self):
-        with open('test3.csv','w', encoding='utf-8', newline='') as csvFile:
+        with open(self.csvfile, 'w', encoding='utf-8', newline='') as csvFile:
             writer = csv.writer(csvFile, dialect='excel')
-            for i in range(1000000):
-                newTimestamp = self.ts + random.randint(10000000, 10000000000) + random.randint(1000, 10000000) + random.randint(1, 1000)
-                d = datetime.datetime.fromtimestamp(newTimestamp / 1000)
-                dt = str(d.strftime("%Y-%m-%d %H:%M:%S.%f"))
-                writer.writerow(["'%s'" % dt, random.randint(1, 100), random.uniform(1, 100), random.randint(1, 100), random.randint(1, 100)])
+            for i in range(self.rows):                
+                writer.writerow([self.ts + i, random.randint(1, 100), random.uniform(1, 100), random.randint(1, 100), random.randint(1, 100)])
     
     def removCSVHeader(self):
         data = pd.read_csv("ordered.csv")
@@ -45,23 +44,25 @@ class TDTestCase:
         data.to_csv("ordered.csv", header = False, index = False)
 
     def run(self):
+        self.writeCSV()
+
         tdSql.prepare()
-        
         tdSql.execute("create table t1(ts timestamp, c1 int, c2 float, c3 int, c4 int)")
         startTime = time.time()
-        tdSql.execute("insert into t1 file 'outoforder.csv'")
+        tdSql.execute("insert into t1 file '%s'" % self.csvfile) 
         duration = time.time() - startTime
-        print("Out of Order - Insert time: %d" % duration)
-        tdSql.query("select count(*) from t1")
-        rows = tdSql.getData(0, 0)
+        print("Insert time: %d" % duration)
+        tdSql.query("select * from t1")
+        tdSql.checkRows(self.rows)
         
-        tdSql.execute("create table t2(ts timestamp, c1 int, c2 float, c3 int, c4 int)")
-        startTime = time.time()
-        tdSql.execute("insert into t2 file 'ordered.csv'")
-        duration = time.time() - startTime
-        print("Ordered - Insert time: %d" % duration)
-        tdSql.query("select count(*) from t2")
-        tdSql.checkData(0,0, rows)
+        tdSql.execute("create table stb(ts timestamp, c1 int, c2 float, c3 int, c4 int) tags(t1 int, t2 binary(20))")
+        tdSql.execute("insert into t2 using stb(t1) tags(1) file '%s'" % self.csvfile)
+        tdSql.query("select * from stb")
+        tdSql.checkRows(self.rows)
+
+        tdSql.execute("insert into t3 using stb tags(1, 'test') file '%s'" % self.csvfile)
+        tdSql.query("select * from stb")
+        tdSql.checkRows(self.rows * 2)
 
     def stop(self):
         tdSql.close()
diff --git a/tests/pytest/insert/retentionpolicy.py b/tests/pytest/insert/retentionpolicy.py
index 067fe3e5c3..e43321cd6e 100644
--- a/tests/pytest/insert/retentionpolicy.py
+++ b/tests/pytest/insert/retentionpolicy.py
@@ -115,7 +115,7 @@ class TDTestRetetion:
         cmd = 'select * from test'
         self.queryRows=tdSql.query(cmd)
         self.checkRows(4,cmd)
-        while datetime.datetime.now() < (ttime + datetime.timedelta(hours=72)):
+        while datetime.datetime.now() <= (ttime + datetime.timedelta(hours=72)):
             time.sleep(0.001)
         cmd = 'select * from test'
         self.queryRows=tdSql.query(cmd)
diff --git a/tests/pytest/util/dnodes.py b/tests/pytest/util/dnodes.py
index 0f71ffd0a3..ae4ba97eb3 100644
--- a/tests/pytest/util/dnodes.py
+++ b/tests/pytest/util/dnodes.py
@@ -127,6 +127,7 @@ class TDDnode:
             "anyIp":"0",
             "tsEnableTelemetryReporting":"0",
             "dDebugFlag":"135",
+            "tsdbDebugFlag":"135",
             "mDebugFlag":"135",
             "sdbDebugFlag":"135",
             "rpcDebugFlag":"135",
diff --git a/tests/pytest/util/taosdemoCfg.py b/tests/pytest/util/taosdemoCfg.py
index 5071e915a5..d211f86b81 100644
--- a/tests/pytest/util/taosdemoCfg.py
+++ b/tests/pytest/util/taosdemoCfg.py
@@ -25,6 +25,21 @@ from multiprocessing import cpu_count
 
 # TODO: fully test the function. Handle exceptions.
 #       Handle json format not accepted by taosdemo
+
+### How to use TaosdemoCfg:
+#   Before you start: 
+#       Make sure you understand how is taosdemo's JSON file structured. Because the python used does
+#       not support directory in directory for self objects, the config is being tear to different parts.
+#       Please make sure you understand which directory represent which part of which type of the file 
+#       This module will reassemble the parts when creating the JSON file.
+#
+#   Basic use example
+#   step 1:use self.append_sql_stb() to append the insert/query/subscribe directory into the module
+#       you can append many insert/query/subscribe directory, but pay attention about taosdemo's limit
+#   step 2:use alter function to alter the specific config 
+#   step 3:use the generation function to generate the files
+#
+#   step 1 and step 2 can be replaced with using import functions
 class TDTaosdemoCfg:
     def __init__(self):
         self.insert_cfg = {
@@ -264,7 +279,7 @@ class TDTaosdemoCfg:
         elif key == "super_table_query":
             self.query_cfg["super_table_query"] = self.stable_query
         else:
-            self.table_query[key] = value
+            self.query_cfg[key] = value
 
     def alter_sub_cfg(self, key, value):
         if key == "specified_table_query":
@@ -272,7 +287,7 @@ class TDTaosdemoCfg:
         elif key == "super_table_query":
             self.sub_cfg["super_table_query"] = self.stable_sub
         else:
-            self.table_query[key] = value
+            self.sub_cfg[key] = value
 
     def alter_sub_stb(self, key, value):
         if key == "sqls":
diff --git a/tests/script/general/parser/where.sim b/tests/script/general/parser/where.sim
index d20f013a8e..781b2725b5 100644
--- a/tests/script/general/parser/where.sim
+++ b/tests/script/general/parser/where.sim
@@ -352,18 +352,24 @@ if $rows != 0 then
  return -1
 endi
 
-print ==========================> td-4783
+print ==========================> td-4783,td-4792
 sql create table where_ts(ts timestamp, f int)
 sql insert into where_ts values('2021-06-19 16:22:00', 1);
 sql insert into where_ts values('2021-06-19 16:23:00', 2);
 sql insert into where_ts values('2021-06-19 16:24:00', 3);
 sql insert into where_ts values('2021-06-19 16:25:00', 1);
 sql select * from (select * from where_ts) where ts<'2021-06-19 16:25:00' and ts>'2021-06-19 16:22:00'
-if $row != 2 then
+if $rows != 2 then
   return -1
 endi
 print $data00, $data01
 if $data01 != 2 then
   return -1
 endi
+sql insert into where_ts values(now, 5);
+sleep 10
+sql select * from (select * from where_ts) where ts<now;
+if $rows != 5 then
+  return -1
+endi
 system sh/exec.sh -n dnode1 -s stop -x SIGINT