Merge remote-tracking branch 'origin/feature/query' into feature/query

2020-09-17 13:56:30 +08:00 · 2020-09-17 13:56:30 +08:00 · 8e5a5d8ee1
parent 7ffdd6457b 1741508f4f
commit 8e5a5d8ee1
67 changed files with 2303 additions and 1527 deletions
--- a/alert/cmd/alert/install_driver.sh
+++ b/alert/cmd/alert/install_driver.sh
@ -9,9 +9,7 @@ set -e
 script_dir=$(dirname $(readlink -f "$0"))
 # Dynamic directory
 lib_link_dir="/usr/lib"
-
-#install main path
-install_main_dir="/usr/local/taos"
+lib64_link_dir="/usr/lib64"

 # Color setting
 RED='\033[0;31m'
@ -25,24 +23,23 @@ if command -v sudo > /dev/null; then
    csudo="sudo"
 fi

-function clean_driver() {
-    ${csudo} rm -f /usr/lib/libtaos.so || :
-}
-
 function install_driver() {
-    echo -e "${GREEN}Start to install TDengine client driver ...${NC}"
-    
-    #create install main dir and all sub dir
-    ${csudo} mkdir -p ${install_main_dir}  
-    ${csudo} mkdir -p ${install_main_dir}/driver
-
-    ${csudo} rm -f ${lib_link_dir}/libtaos.*         || :
-    ${csudo} cp -rf ${script_dir}/driver/* ${install_main_dir}/driver && ${csudo} chmod 777 ${install_main_dir}/driver/*  
-    ${csudo} ln -s ${install_main_dir}/driver/libtaos.* ${lib_link_dir}/libtaos.so.1
-    ${csudo} ln -s ${lib_link_dir}/libtaos.so.1 ${lib_link_dir}/libtaos.so
- 
    echo
-    echo -e "\033[44;32;1mTDengine client driver is successfully installed!${NC}"
+    if [[ -d ${lib_link_dir} && ! -e ${lib_link_dir}/libtaos.so ]]; then
+      echo -e "${GREEN}Start to install TDengine client driver ...${NC}"
+      ${csudo} ln -s ${script_dir}/driver/libtaos.* ${lib_link_dir}/libtaos.so.1       || :
+      ${csudo} ln -s ${lib_link_dir}/libtaos.so.1 ${lib_link_dir}/libtaos.so           || :
+      
+      if [[ -d ${lib64_link_dir} && ! -e ${lib64_link_dir}/libtaos.so ]]; then
+        ${csudo} ln -s ${script_dir}/driver/libtaos.* ${lib64_link_dir}/libtaos.so.1     || :
+        ${csudo} ln -s ${lib64_link_dir}/libtaos.so.1 ${lib64_link_dir}/libtaos.so       || :
+      fi
+
+      echo
+      echo -e "${GREEN}TDengine client driver is successfully installed!${NC}"
+    else
+      echo -e "${GREEN}TDengine client driver already exists, Please confirm whether the alert version matches the client driver version!${NC}"
+    fi
 }

 install_driver
--- a/alert/cmd/alert/main.go
+++ b/alert/cmd/alert/main.go
@ -119,7 +119,7 @@ WantedBy=multi-user.target
 	return nil
 }

-const version = "TDengine alert v2.0.0.1"
+var version = "2.0.0.1s"

 func main() {
 	var (
@ -133,7 +133,7 @@ func main() {
 	flag.Parse()

 	if showVersion {
-		fmt.Println(version)
+		fmt.Println("TDengine alert v" + version)
 		return
 	}

--- a/alert/release.sh
+++ b/alert/release.sh
@ -6,9 +6,9 @@ set -e
 # set parameters by default value
 cpuType=amd64    # [armv6l | arm64 | amd64 | 386]
 osType=linux   # [linux | darwin | windows]
-
+version=""
 declare -A archMap=(["armv6l"]="arm" ["arm64"]="arm64" ["amd64"]="x64" ["386"]="x86")
-while getopts "h:c:o:" arg
+while getopts "h:c:o:n:" arg
 do
  case $arg in
    c)
@ -19,6 +19,10 @@ do
      #echo "osType=$OPTARG"
      osType=$(echo $OPTARG)
      ;;
+    n)
+      #echo "version=$OPTARG"
+      version=$(echo $OPTARG)
+      ;;
    h)
      echo "Usage: `basename $0` -c [armv6l | arm64 | amd64 | 386] -o [linux | darwin | windows]"
      exit 0
@ -30,18 +34,27 @@ do
  esac
 done

+if [ "$version" == "" ]; then 
+  echo "Please input the correct version!"
+  exit 1
+fi

 startdir=$(pwd)
 scriptdir=$(dirname $(readlink -f $0))
 cd ${scriptdir}/cmd/alert
-version=$(grep 'const version =' main.go | awk '{print $NF}')
-version=${version%\"}
-version=${version:1}

 echo "cpuType=${cpuType}"
 echo "osType=${osType}"
 echo "version=${version}"

-GOOS=${osType} GOARCH=${cpuType} go build
+GOOS=${osType} GOARCH=${cpuType} go build -ldflags '-X main.version='${version}
+
+mkdir -p TDengine-alert/driver
+
+cp alert alert.cfg install_driver.sh ./TDengine-alert/.
+cp ../../../debug/build/lib/libtaos.so.${version} ./TDengine-alert/driver/.
+chmod 777 ./TDengine-alert/install_driver.sh
+
+tar -I 'gzip -9' -cf ${startdir}/TDengine-alert-${version}-${osType^}-${archMap[${cpuType}]}.tar.gz TDengine-alert/
+rm -rf ./TDengine-alert

-tar -I 'gzip -9' -cf ${startdir}/TDengine-alert-${version}-${osType^}-${archMap[${cpuType}]}.tar.gz alert alert.cfg install_driver.sh driver/
--- a/cmake/define.inc
+++ b/cmake/define.inc
@ -100,7 +100,7 @@ IF (TD_LINUX)
  ENDIF ()
  
  SET(DEBUG_FLAGS "-O0 -DDEBUG")
-  SET(RELEASE_FLAGS "-O0")
+  SET(RELEASE_FLAGS "-O0 -Wno-unused-variable -Wunused-but-set-variable")
  
  IF (${COVER} MATCHES "true")
    MESSAGE(STATUS "Test coverage mode, add extra flags")
--- a/documentation20/webdocs/markdowndocs/Connections
+++ b/documentation20/webdocs/markdowndocs/Connections
@ -11,7 +11,7 @@ TDengine能够与开源数据可视化系统[Grafana](https://www.grafana.com/)

 ### 配置Grafana

-TDengine的Grafana插件在安装包的/usr/local/taos/connector/grafana目录下。
+TDengine的Grafana插件在安装包的/usr/local/taos/connector/grafanaplugin目录下。

 以CentOS 7.2操作系统为例，将tdengine目录拷贝到/var/lib/grafana/plugins目录下，重新启动grafana即可。

--- a/documentation20/webdocs/markdowndocs/Queries-ch.md
+++ b/documentation20/webdocs/markdowndocs/Queries-ch.md
@ -78,6 +78,18 @@ taos> SELECT SUM(current) FROM meters INTERVAL(1s);
 2018-10-03 14:38:16.000 |              36.000000000 |
 Query OK, 5 row(s) in set (0.001538s)
 ```
+降采样操作也支持时间偏移，比如：将所有智能电表采集的电流值每秒钟求和，但要求每个时间窗口从 500 毫秒开始
+```mysql
+taos> SELECT SUM(current) FROM meters INTERVAL(1s, 500a);
+           ts            |       sum(current)        |
+======================================================
+ 2018-10-03 14:38:04.500 |              11.189999809 |
+ 2018-10-03 14:38:05.500 |              31.900000572 |
+ 2018-10-03 14:38:06.500 |              11.600000000 |
+ 2018-10-03 14:38:15.500 |              12.300000381 |
+ 2018-10-03 14:38:16.500 |              35.000000000 |
+Query OK, 5 row(s) in set (0.001521s)
+```

 物联网场景里，每个数据采集点采集数据的时间是难同步的，但很多分析算法(比如FFT)需要把采集的数据严格按照时间等间隔的对齐，在很多系统里，需要应用自己写程序来处理，但使用TDengine的降采样操作就轻松解决。如果一个时间间隔里，没有采集的数据，TDengine还提供插值计算的功能。

--- a/documentation20/webdocs/markdowndocs/Super
+++ b/documentation20/webdocs/markdowndocs/Super
@ -148,7 +148,7 @@ INSERT INTO <tb1_name> USING <stb1_name> TAGS (<tag1_value1>, ...) VALUES (<fiel
 SELECT function<field_name>,… 
 FROM <stable_name> 
 WHERE <tag_name> <[=|<=|>=|<>] values..> ([AND|OR] …)
- INTERVAL (<time range>)
+ INTERVAL (<interval> [, offset])
 GROUP BY <tag_name>, <tag_name>…
 ORDER BY <tag_name> <asc|desc>
 SLIMIT <group_limit>
--- a/documentation20/webdocs/markdowndocs/TAOS
+++ b/documentation20/webdocs/markdowndocs/TAOS
@ -33,8 +33,7 @@ taos> DESCRIBE meters;
 - 内部函数now是服务器的当前时间
 - 插入记录时，如果时间戳为now，插入数据时使用服务器当前时间
 - Epoch Time: 时间戳也可以是一个长整数，表示从1970-01-01 08:00:00.000开始的毫秒数
- 时间可以加减，比如 now-2h，表明查询时刻向前推2个小时(最近2小时)。数字后面的时间单位：a(毫秒), s(秒), m(分), h(小时), d(天)，w(周), n(月), y(年)。比如select * from t1 where ts > now-2w and ts <= now-1w, 表示查询两周前整整一周的数据
- TDengine暂不支持时间窗口按照自然年和自然月切分。Where条件中的时间窗口单位的换算关系如下：interval(1y) 等效于 interval(365d), interval(1n) 等效于 interval(30d), interval(1w) 等效于 interval(7d)
+- 时间可以加减，比如 now-2h，表明查询时刻向前推2个小时(最近2小时)。 数字后面的时间单位可以是 a(毫秒)、s(秒)、 m(分)、h(小时)、d(天)、w(周)。 比如select * from t1 where ts > now-2w and ts <= now-1w, 表示查询两周前整整一周的数据。 在指定降频操作(down sampling)的时间窗口(interval)时，时间单位还可以使用 n(自然月) 和 y(自然年)。

 TDengine缺省的时间戳是毫秒精度，但通过修改配置参数enableMicrosecond就可支持微秒。

@ -299,7 +298,7 @@ TDengine缺省的时间戳是毫秒精度，但通过修改配置参数enableMic
 SELECT select_expr [, select_expr ...]
    FROM {tb_name_list}
    [WHERE where_condition]
-    [INTERVAL [interval_offset,] interval_val]
+    [INTERVAL (interval_val [, interval_offset])]
    [FILL fill_val]
    [SLIDING fill_val]
    [GROUP BY col_list]
@ -972,17 +971,17 @@ TDengine支持按时间段进行聚合，可以将表中数据按照时间段进
 ```mysql
 SELECT function_list FROM tb_name 
  [WHERE where_condition]
-  INTERVAL (interval)
+  INTERVAL (interval [, offset])
  [FILL ({NONE | VALUE | PREV | NULL | LINEAR})]

 SELECT function_list FROM stb_name 
  [WHERE where_condition]
-  INTERVAL (interval)
+  INTERVAL (interval [, offset])
  [FILL ({ VALUE | PREV | NULL | LINEAR})]
  [GROUP BY tags]
 ```

- 聚合时间段的长度由关键词INTERVAL指定，最短时间间隔10毫秒（10a）。聚合查询中，能够同时执行的聚合和选择函数仅限于单个输出的函数：count、avg、sum 、stddev、leastsquares、percentile、min、max、first、last，不能使用具有多行输出结果的函数（例如：top、bottom、diff以及四则运算）。
+- 聚合时间段的长度由关键词INTERVAL指定，最短时间间隔10毫秒（10a），并且支持偏移（偏移必须小于间隔）。聚合查询中，能够同时执行的聚合和选择函数仅限于单个输出的函数：count、avg、sum 、stddev、leastsquares、percentile、min、max、first、last，不能使用具有多行输出结果的函数（例如：top、bottom、diff以及四则运算）。
 - WHERE语句可以指定查询的起止时间和其他过滤条件 
 - FILL语句指定某一时间区间数据缺失的情况下的填充模式。填充模式包括以下几种：
  1. 不进行填充：NONE(默认填充模式)。
--- a/documentation20/webdocs/markdowndocs/Taos
+++ b/documentation20/webdocs/markdowndocs/Taos
@ -1,7 +1,7 @@
 # TDengine 2.0 错误码以及对应的十进制码


-| Code                  |  bit  |   error code |  错误描述                  | 十进制错误码       |
+| 状态码                 |  模  |   错误码（十六进制） |  错误描述                  | 错误码（十进制）   |
 |-----------------------| :---: | :---------:  | :------------------------ | ---------------- |
 |TSDB_CODE_RPC_ACTION_IN_PROGRESS|	0	| 0x0001|	 "Action in progress"|	-2147483647|
 |TSDB_CODE_RPC_AUTH_REQUIRED|	0	| 0x0002	| "Authentication required"|	-2147483646|
@ -87,7 +87,7 @@
 |TSDB_CODE_MND_INVALID_ACCT_OPTION|	0	| 0x0342	| "Invalid account options"|	-2147482814|
 |TSDB_CODE_MND_USER_ALREADY_EXIST|	0	| 0x0350	| "User already exists"|	-2147482800|
 |TSDB_CODE_MND_INVALID_USER	|0	| 0x0351	| "Invalid user"	|-2147482799|
-|TSDB_CODE_MND_INVALID_USER_FORMAT|	|0	 |0x0352	 |"Invalid user format"	|-2147482798|
+|TSDB_CODE_MND_INVALID_USER_FORMAT| 0	 |0x0352	 |"Invalid user format"	|-2147482798|
 |TSDB_CODE_MND_INVALID_PASS_FORMAT|	0|	 0x0353	| "Invalid password format"|	-2147482797|
 |TSDB_CODE_MND_NO_USER_FROM_CONN|	0	| 0x0354	| "Can not get user from conn"|	-2147482796|
 |TSDB_CODE_MND_TOO_MANY_USERS|	0	| 0x0355|	 "Too many users"|	-2147482795|
@ -107,7 +107,7 @@
 |TSDB_CODE_MND_DB_NOT_SELECTED|	0	| 0x0380	| "Database not specified or available"|	-2147482752|
 |TSDB_CODE_MND_DB_ALREADY_EXIST|	0	| 0x0381	| "Database already exists"|	-2147482751|
 |TSDB_CODE_MND_INVALID_DB_OPTION|	0	| 0x0382	| "Invalid database options"|	-2147482750|
-|TSDB_CODE_MND_INVALID_DB|	|0	| 0x0383	| "Invalid database name"|	-2147482749|
+|TSDB_CODE_MND_INVALID_DB|	0	| 0x0383	| "Invalid database name"|	-2147482749|
 |TSDB_CODE_MND_MONITOR_DB_FORBIDDEN|	0	| 0x0384	| "Cannot delete monitor database"|	-2147482748|
 |TSDB_CODE_MND_TOO_MANY_DATABASES|	0|	 0x0385	| "Too many databases for account"|	-2147482747|
 |TSDB_CODE_MND_DB_IN_DROPPING|	0	| 0x0386|	 "Database not available"	|-2147482746|
--- a/documentation20/webdocs/markdowndocs/cluster-ch.md
+++ b/documentation20/webdocs/markdowndocs/cluster-ch.md
@ -1,48 +1,69 @@
 # TDengine 集群安装、管理

-多个taosd的运行实例可以组成一个集群，以保证TDengine的高可靠运行，并提供水平扩展能力。要了解TDengine 2.0的集群管理，需要对集群的基本概念有所了解，请看TDengine 2.0整体架构一章。而且在安装集群之前，请按照[《立即开始》](https://www.taosdata.com/cn/getting-started20/)一章安装并体验过单节点功能。
+多个TDengine服务器，也就是多个taosd的运行实例可以组成一个集群，以保证TDengine的高可靠运行，并提供水平扩展能力。要了解TDengine 2.0的集群管理，需要对集群的基本概念有所了解，请看TDengine 2.0整体架构一章。而且在安装集群之前，先请按照[《立即开始》](https://www.taosdata.com/cn/getting-started20/)一章安装并体验单节点功能。

-集群的每个节点是由End Point来唯一标识的，End Point是由FQDN(Fully Qualified Domain Name)外加Port组成，比如 h1.taosdata.com:6030。一般FQDN就是服务器的hostname，可通过Linux命令`hostname -f`获取,FQDN配置参考：[一篇文章说清楚TDengine的FQDN](https://www.taosdata.com/blog/2020/09/11/1824.html)。端口是这个节点对外服务的端口号，缺省是6030，但可以通过taos.cfg里配置参数serverPort进行修改。一个节点可能配置了多个hostname, TDengine会自动获取第一个，但也可以通过taos.cfg里配置参数fqdn进行指定。如果习惯IP地址直接访问，可以将参数fqdn设置为本节点的IP地址。
+集群的每个数据节点是由End Point来唯一标识的，End Point是由FQDN(Fully Qualified Domain Name)外加Port组成，比如 h1.taosdata.com:6030。一般FQDN就是服务器的hostname，可通过Linux命令`hostname -f`获取,FQDN配置参考：[一篇文章说清楚TDengine的FQDN](https://www.taosdata.com/blog/2020/09/11/1824.html)。端口是这个数据节点对外服务的端口号，缺省是6030，但可以通过taos.cfg里配置参数serverPort进行修改。一个物理节点可能配置了多个hostname, TDengine会自动获取第一个，但也可以通过taos.cfg里配置参数fqdn进行指定。如果习惯IP地址直接访问，可以将参数fqdn设置为本节点的IP地址。

 TDengine的集群管理极其简单，除添加和删除节点需要人工干预之外，其他全部是自动完成，最大程度的降低了运维的工作量。本章对集群管理的操作做详细的描述。

 ## 准备工作

-**第一步**：如果搭建集群的节点中，存有之前的测试数据、装过1.X的版本，或者装过其他版本的TDengine，请先将其删除，并清空所有数据，具体步骤请参考博客[《TDengine多种安装包的安装和卸载》](https://www.taosdata.com/blog/2019/08/09/566.html ) 
+**第零步**：规划集群所有物理节点的FQDN，将规划好的FQDN分别添加到每个物理节点的/etc/hostname；修改每个物理节点的/etc/hosts，将所有集群物理节点的IP与FQDN的对应添加好【如部署了DNS，请联系网络管理员在DNS上做好相关配置】；
+
+**第一步**：如果搭建集群的物理节点中，存有之前的测试数据、装过1.X的版本，或者装过其他版本的TDengine，请先将其删除，并清空所有数据，具体步骤请参考博客[《TDengine多种安装包的安装和卸载》](https://www.taosdata.com/blog/2019/08/09/566.html ) 
 **注意1：**因为FQDN的信息会写进文件，如果之前没有配置或者更改FQDN，且启动了TDengine。请一定在确保数据无用或者备份的前提下，清理一下之前的数据（rm -rf /var/lib/taos/）；
 **注意2：**客户端也需要配置，确保它可以正确解析每个节点的FQDN配置，不管是通过DNS服务，还是 Host 文件。

-**第二步**：建议关闭防火墙，至少保证端口：6030 - 6042的TCP和UDP端口都是开放的。**强烈建议**先关闭防火墙，集群搭建完毕之后，再来配置端口；
+**第二步**：建议关闭所有物理节点的防火墙，至少保证端口：6030 - 6042的TCP和UDP端口都是开放的。**强烈建议**先关闭防火墙，集群搭建完毕之后，再来配置端口；

-**第三步**：在所有节点安装TDengine，且版本必须是一致的，**但不要启动taosd**；
+**第三步**：在所有节点安装TDengine，且版本必须是一致的，**但不要启动taosd**。安装时，提示输入是否要加入一个已经存在的TDengine集群时，第一个物理节点直接回车创建新集群，后续物理节点则输入该集群任何一个在线的物理节点的FQDN:端口号(默认6030)；

-**第四步**：检查、配置所有节点的FQDN：
+**第四步**：检查所有数据节点，以及应用所在物理节点的网络设置：

-1. 每个节点上执行命令`hostname -f`，查看和确认所有节点的hostname是不相同的；
-2. 每个节点上执行`ping host`, 其中host是其他节点的hostname, 看能否ping通其它节点; 如果不能ping通，需要检查网络设置, 或/etc/hosts文件，或DNS的配置。如果无法ping通，是无法组成集群的。
-3. 每个节点的FQDN就是输出的hostname外加端口号，比如h1.taosdata.com:6030
+1. 每个物理节点上执行命令`hostname -f`，查看和确认所有节点的hostname是不相同的(应用驱动所在节点无需做此项检查)；
+2. 每个物理节点上执行`ping host`, 其中host是其他物理节点的hostname, 看能否ping通其它物理节点; 如果不能ping通，需要检查网络设置, 或/etc/hosts文件(Windows系统默认路径为C:\Windows\system32\drivers\etc\hosts)，或DNS的配置。如果无法ping通，是无法组成集群的；
+3. 每个数据节点的End Point就是输出的hostname外加端口号，比如h1.taosdata.com:6030

-**第五步**：修改TDengine的配置文件（所有节点的文件/etc/taos/taos.cfg都需要修改）。假设准备启动的第一个节点End Point为 h1.taosdata.com:6030, 那么以下几个参数与集群相关：
+**第五步**：修改TDengine的配置文件（所有节点的文件/etc/taos/taos.cfg都需要修改）。假设准备启动的第一个数据节点End Point为 h1.taosdata.com:6030, 其与集群配置相关参数如下：

 ```
-// firstEp 集群中所有节点的配置都是一致的，对其第一次访问后，就获得了整个集群的信息
+// firstEp 是每个数据节点首次启动后连接的第一个数据节点
 firstEp               h1.taosdata.com:6030

-// 配置本节点的FQDN，如果本机只有一个hostname, 无需配置
+// 配置本数据节点的FQDN，如果本机只有一个hostname, 无需配置
 fqdn                  h1.taosdata.com

-// 配置本节点的端口号，缺省是6030
+// 配置本数据节点的端口号，缺省是6030
 serverPort            6030

 // 服务端节点数为偶数的时候，需要配置，请参考《Arbitrator的使用》的部分
 arbitrator            ha.taosdata.com:6042
 ```

-一定要修改的参数是firstEp, 其他参数可不做任何修改，除非你很清楚为什么要修改。
+一定要修改的参数是firstEp和fqdn, 其他参数可不做任何修改，除非你很清楚为什么要修改。

-## 启动第一个节点
+**加入到集群中的数据节点dnode，涉及集群相关的下表11项参数必须完全相同，否则不能成功加入到集群中。**
+
+| **#** | **配置参数名称**   | **含义**                                 |
+| ----- | ------------------ | ---------------------------------------- |
+| 1     | numOfMnodes        | 系统中管理节点个数                       |
+| 2     | mnodeEqualVnodeNum | 一个mnode等同于vnode消耗的个数           |
+| 3     | offlineThreshold   | dnode离线阈值，超过该时间将导致Dnode离线 |
+| 4     | statusInterval     | dnode向mnode报告状态时长                 |
+| 5     | arbitrator         | 系统中裁决器的end point                  |
+| 6     | timezone           | 时区                                     |
+| 7     | locale             | 系统区位信息及编码格式                   |
+| 8     | charset            | 字符集编码                               |
+| 9     | balance            | 是否启动负载均衡                         |
+| 10    | maxTablesPerVnode  | 每个vnode中能够创建的最大表个数          |
+| 11    | maxVgroupsPerDb    | 每个DB中 能够使用的最大vnode个数         |
+
+ 
+
+## 启动第一个数据节点
+
+按照[《立即开始》](https://www.taosdata.com/cn/getting-started20/)里的指示，启动第一个数据节点，例如h1.taosdata.com，然后执行taos, 启动taos shell，从shell里执行命令"show dnodes;"，如下所示：

-按照[《立即开始》](https://www.taosdata.com/cn/getting-started20/)里的指示，启动第一个节点h1.taosdata.com，然后执行taos, 启动taos shell，从shell里执行命令"show dnodes;"，如下所示：
   ```
 Welcome to the TDengine shell from Linux, Client Version:2.0.0.0
 Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.
@ -55,74 +76,86 @@ Query OK, 1 row(s) in set (0.006385s)

 taos>
   ```
-上述命令里，可以看到这个刚启动的这个节点的End Point是：h1.taos.com:6030

-## 启动后续节点
+上述命令里，可以看到这个刚启动的这个数据节点的End Point是：h1.taos.com:6030，就是这个新集群的firstEP。

-将后续的节点添加到现有集群，具体有以下几步：
+## 启动后续数据节点

-1. 按照["立即开始“](https://www.taosdata.com/cn/getting-started/)一章的方法在每个节点启动taosd。
+将后续的数据节点添加到现有集群，具体有以下几步：

-2. 在第一个节点，使用CLI程序taos, 登录进TDengine系统, 执行命令:
+1. 按照["立即开始“](https://www.taosdata.com/cn/getting-started/)一章的方法在每个物理节点启动taosd；

-    ```
-    CREATE DNODE "h2.taos.com:6030"； 
-    ```
+2. 在第一个数据节点，使用CLI程序taos, 登录进TDengine系统, 执行命令:

-    将新节点的End Point (准备工作中第四步获知的) 添加进集群的EP列表。**"fqdn:port"需要用双引号引起来**，否则出错。请注意将示例的“h2.taos.com:6030" 替换为这个新节点的End Point。
+   ```
+   CREATE DNODE "h2.taos.com:6030"； 
+   ```
+
+   将新数据节点的End Point (准备工作中第四步获知的) 添加进集群的EP列表。**"fqdn:port"需要用双引号引起来**，否则出错。请注意将示例的“h2.taos.com:6030" 替换为这个新数据节点的End Point。

 3. 然后执行命令

-    ```
-    SHOW DNODES；
-    ```
+   ```
+   SHOW DNODES；
+   ```

-    查看新节点是否被成功加入。如果该被加入的节点处于离线状态，请做两个检查
-    
-    - 查看该节点的taosd是否正常工作，如果没有正常运行，需要先检查为什么
-    - 查看该节点taosd日志文件taosdlog.0里前面几行日志(一般在/var/log/taos目录)，看日志里输出的该节点fqdn以及端口号是否为刚添加的End Point。如果不一致，需要将正确的End Point添加进去。
+   查看新节点是否被成功加入。如果该被加入的数据节点处于离线状态，请做两个检查

-按照上述步骤可以源源不断的将新的节点加入到集群。
+   - 查看该数据节点的taosd是否正常工作，如果没有正常运行，需要先检查为什么
+   - 查看该数据节点taosd日志文件taosdlog.0里前面几行日志(一般在/var/log/taos目录)，看日志里输出的该数据节点fqdn以及端口号是否为刚添加的End Point。如果不一致，需要将正确的End Point添加进去。
+
+按照上述步骤可以源源不断的将新的数据节点加入到集群。

 **提示：**

- firstEp这个参数仅仅在该节点第一次加入集群时有作用，加入集群后，该节点会保存最新的mnode的End Point列表，不再依赖这两个参数。
- 两个没有配置firstEp参数的dnode启动后，会独立运行起来。这个时候，无法将其中一个节点加入到另外一个节点，形成集群。**无法将两个独立的集群合并成为新的集群**。
+- 任何已经加入集群在线的数据节点，都可以作为后续待加入节点的firstEP。
+- firstEp这个参数仅仅在该数据节点首次加入集群时有作用，加入集群后，该数据节点会保存最新的mnode的End Point列表，不再依赖这个参数。
+- 两个没有配置firstEp参数的数据节点dnode启动后，会独立运行起来。这个时候，无法将其中一个数据节点加入到另外一个数据节点，形成集群。**无法将两个独立的集群合并成为新的集群**。

-## 节点管理
+## 数据节点管理
+
+### 添加数据节点

-### 添加节点
 执行CLI程序taos, 使用root账号登录进系统, 执行:
+
 ```
 CREATE DNODE "fqdn:port"； 
 ```
-将新节点的End Point添加进集群的EP列表。**"fqdn:port"需要用双引号引起来**，否则出错。一个节点对外服务的fqdn和port可以通过配置文件taos.cfg进行配置，缺省是自动获取。

-### 删除节点
+将新数据节点的End Point添加进集群的EP列表。**"fqdn:port"需要用双引号引起来**，否则出错。一个数据节点对外服务的fqdn和port可以通过配置文件taos.cfg进行配置，缺省是自动获取。【强烈不建议用自动获取方式来配置FQDN，可能导致生成的数据节点的End Point不是所期望的】
+
+### 删除数据节点
+
 执行CLI程序taos, 使用root账号登录进TDengine系统，执行：

 ```
 DROP DNODE "fqdn:port";
 ```
+
 其中fqdn是被删除的节点的FQDN，port是其对外服务器的端口号

-### 查看节点
+### 查看数据节点
+
 执行CLI程序taos,使用root账号登录进TDengine系统，执行：

 ```
 SHOW DNODES;
 ```
-它将列出集群中所有的dnode,每个dnode的fqdn:port, 状态(ready, offline等），vnode数目，还未使用的vnode数目等信息。在添加或删除一个节点后，可以使用该命令查看。
+
+它将列出集群中所有的dnode,每个dnode的fqdn:port, 状态(ready, offline等），vnode数目，还未使用的vnode数目等信息。在添加或删除一个数据节点后，可以使用该命令查看。

 ### 查看虚拟节点组

-为充分利用多核技术，并提供scalability，数据需要分片处理。因此TDengine会将一个DB的数据切分成多份，存放在多个vnode里。这些vnode可能分布在多个dnode里，这样就实现了水平扩展。一个vnode仅仅属于一个DB，但一个DB可以有多个vnode。vnode的是mnode根据当前系统资源的情况，自动进行分配的，无需任何人工干预。
+为充分利用多核技术，并提供scalability，数据需要分片处理。因此TDengine会将一个DB的数据切分成多份，存放在多个vnode里。这些vnode可能分布在多个数据节点dnode里，这样就实现了水平扩展。一个vnode仅仅属于一个DB，但一个DB可以有多个vnode。vnode的是mnode根据当前系统资源的情况，自动进行分配的，无需任何人工干预。

 执行CLI程序taos,使用root账号登录进TDengine系统，执行：
+
 ```
 SHOW VGROUPS;
 ```
+
 ## vnode的高可用性
+
 TDengine通过多副本的机制来提供系统的高可用性，包括vnode和mnode的高可用性。

 vnode的副本数是与DB关联的，一个集群里可以有多个DB，根据运营的需求，每个DB可以配置不同的副本数。创建数据库时，通过参数replica 指定副本数（缺省为1）。如果副本数为1，系统的可靠性无法保证，只要数据所在的节点宕机，就将无法提供服务。集群的节点数必须大于等于副本数，否则创建表时将返回错误“more dnodes are needed"。比如下面的命令将创建副本数为3的数据库demo：
@ -130,21 +163,25 @@ vnode的副本数是与DB关联的，一个集群里可以有多个DB，根据
 ```
 CREATE DATABASE demo replica 3;
 ```
-一个DB里的数据会被切片分到多个vnode group，vnode group里的vnode数目就是DB的副本数，同一个vnode group里各vnode的数据是完全一致的。为保证高可用性，vnode group里的vnode一定要分布在不同的dnode里（实际部署时，需要在不同的物理机上），只要一个vgroup里超过半数的vnode处于工作状态，这个vgroup就能正常的对外服务。

-一个dnode里可能有多个DB的数据，因此一个dnode离线时，可能会影响到多个DB。如果一个vnode group里的一半或一半以上的vnode不工作，那么该vnode group就无法对外服务，无法插入或读取数据，这样会影响到它所属的DB的一部分表的读写操作。
+一个DB里的数据会被切片分到多个vnode group，vnode group里的vnode数目就是DB的副本数，同一个vnode group里各vnode的数据是完全一致的。为保证高可用性，vnode group里的vnode一定要分布在不同的数据节点dnode里（实际部署时，需要在不同的物理机上），只要一个vgroup里超过半数的vnode处于工作状态，这个vgroup就能正常的对外服务。

-因为vnode的引入，无法简单的给出结论：“集群中过半dnode工作，集群就应该工作”。但是对于简单的情形，很好下结论。比如副本数为3，只有三个dnode，那如果仅有一个节点不工作，整个集群还是可以正常工作的，但如果有两个节点不工作，那整个集群就无法正常工作了。
+一个数据节点dnode里可能有多个DB的数据，因此一个dnode离线时，可能会影响到多个DB。如果一个vnode group里的一半或一半以上的vnode不工作，那么该vnode group就无法对外服务，无法插入或读取数据，这样会影响到它所属的DB的一部分表的读写操作。
+
+因为vnode的引入，无法简单的给出结论：“集群中过半数据节点dnode工作，集群就应该工作”。但是对于简单的情形，很好下结论。比如副本数为3，只有三个dnode，那如果仅有一个节点不工作，整个集群还是可以正常工作的，但如果有两个数据节点不工作，那整个集群就无法正常工作了。

 ## Mnode的高可用性
-TDengine集群是由mnode (taosd的一个模块，逻辑节点) 负责管理的，为保证mnode的高可用，可以配置多个mnode副本，副本数由系统配置参数numOfMnodes决定，有效范围为1-3。为保证元数据的强一致性，mnode副本之间是通过同步的方式进行数据复制的。

-一个集群有多个dnode, 但一个dnode至多运行一个mnode实例。多个dnode情况下，哪个dnode可以作为mnode呢？这是完全由系统根据整个系统资源情况，自动指定的。用户可通过CLI程序taos，在TDengine的console里，执行如下命令：
+TDengine集群是由mnode (taosd的一个模块，管理节点) 负责管理的，为保证mnode的高可用，可以配置多个mnode副本，副本数由系统配置参数numOfMnodes决定，有效范围为1-3。为保证元数据的强一致性，mnode副本之间是通过同步的方式进行数据复制的。
+
+一个集群有多个数据节点dnode, 但一个dnode至多运行一个mnode实例。多个dnode情况下，哪个dnode可以作为mnode呢？这是完全由系统根据整个系统资源情况，自动指定的。用户可通过CLI程序taos，在TDengine的console里，执行如下命令：
+
 ```
 SHOW MNODES;
 ```
+
 来查看mnode列表，该列表将列出mnode所处的dnode的End Point和角色(master, slave, unsynced 或offline)。
-当集群中第一个节点启动时，该节点一定会运行一个mnode实例，否则该dnode无法正常工作，因为一个系统是必须有至少一个mnode的。如果numOfMnodes配置为2，启动第二个dnode时，该dnode也将运行一个mnode实例。
+当集群中第一个数据节点启动时，该数据节点一定会运行一个mnode实例，否则该数据节点dnode无法正常工作，因为一个系统是必须有至少一个mnode的。如果numOfMnodes配置为2，启动第二个dnode时，该dnode也将运行一个mnode实例。

 为保证mnode服务的高可用性，numOfMnodes必须设置为2或更大。因为mnode保存的元数据必须是强一致的，如果numOfMnodes大于2，复制参数quorum自动设为2，也就是说，至少要保证有两个副本写入数据成功，才通知客户端应用写入成功。

@ -154,22 +191,25 @@ SHOW MNODES;

 有三种情况，将触发负载均衡，而且都无需人工干预。

- 当一个新节点添加进集群时，系统将自动触发负载均衡，一些节点上的数据将被自动转移到新节点上，无需任何人工干预。
- 当一个节点从集群中移除时，系统将自动把该节点上的数据转移到其他节点，无需任何人工干预。
- 如果一个节点过热（数据量过大），系统将自动进行负载均衡，将该节点的一些vnode自动挪到其他节点。
+- 当一个新数据节点添加进集群时，系统将自动触发负载均衡，一些节点上的数据将被自动转移到新数据节点上，无需任何人工干预。
+- 当一个数据节点从集群中移除时，系统将自动把该数据节点上的数据转移到其他数据节点，无需任何人工干预。
+- 如果一个数据节点过热（数据量过大），系统将自动进行负载均衡，将该数据节点的一些vnode自动挪到其他节点。

-当上述三种情况发生时，系统将启动一各个节点的负载计算，从而决定如何挪动。
+当上述三种情况发生时，系统将启动一各个数据节点的负载计算，从而决定如何挪动。

-##节点离线处理
-如果一个节点离线，TDengine集群将自动检测到。有如下两种情况：
- 改节点离线超过一定时间（taos.cfg里配置参数offlineThreshold控制时长)，系统将自动把该节点删除，产生系统报警信息，触发负载均衡流程。如果该被删除的节点重现上线时，它将无法加入集群，需要系统管理员重新将其添加进集群才会开始工作。
+**【提示】负载均衡由参数balance控制，它决定是否启动自动负载均衡。**
+
+## 数据节点离线处理
+
+如果一个数据节点离线，TDengine集群将自动检测到。有如下两种情况：
+
+- 该数据节点离线超过一定时间（taos.cfg里配置参数offlineThreshold控制时长)，系统将自动把该数据节点删除，产生系统报警信息，触发负载均衡流程。如果该被删除的数据节点重现上线时，它将无法加入集群，需要系统管理员重新将其添加进集群才会开始工作。
 - 离线后，在offlineThreshold的时长内重新上线，系统将自动启动数据恢复流程，等数据完全恢复后，该节点将开始正常工作。

-**注意：**如果一个虚拟节点组（包括mnode组）里每个节点都处于离线或unsynced状态，必须等该虚拟节点组里的所有节点都上线、都能交换状态信息后，才能选出Master，该虚拟节点组才能对外提供服务。比如整个集群有3个节点，副本数为3，如果3个节点都宕机，然后2个节点重启，是无法工作的，只有等3个节点都重启成功，才能对外服务。
+**注意：**如果一个虚拟节点组（包括mnode组）里所归属的每个数据节点都处于离线或unsynced状态，必须等该虚拟节点组里的所有数据节点都上线、都能交换状态信息后，才能选出Master，该虚拟节点组才能对外提供服务。比如整个集群有3个数据节点，副本数为3，如果3个数据节点都宕机，然后2个数据节点重启，是无法工作的，只有等3个数据节点都重启成功，才能对外服务。

 ## Arbitrator的使用

 如果副本数为偶数，当一个vnode group里一半或超过一半的vnode不工作时，是无法从中选出master的。同理，一半或超过一半的mnode不工作时，是无法选出mnode的master的，因为存在“split brain”问题。为解决这个问题，TDengine引入了arbitrator的概念。Arbitrator模拟一个vnode或mnode在工作，但只简单的负责网络连接，不处理任何数据插入或访问。只要包含arbitrator在内，超过半数的vnode或mnode工作，那么该vnode group或mnode组就可以正常的提供数据插入或查询服务。比如对于副本数为2的情形，如果一个节点A离线，但另外一个节点B正常，而且能连接到arbitrator, 那么节点B就能正常工作。

 TDengine安装包里带有一个执行程序tarbitrator, 找任何一台Linux服务器运行它即可。该程序对系统资源几乎没有要求，只需要保证有网络连接即可。该应用的命令行参数`-p`可以指定其对外服务的端口号，缺省是6042。配置每个taosd实例时，可以在配置文件taos.cfg里将参数arbitrator设置为arbitrator的End Point。如果该参数配置了，当副本数为偶数数，系统将自动连接配置的arbitrator。
-
--- a/src/client/inc/tscUtil.h
+++ b/src/client/inc/tscUtil.h
@ -69,6 +69,7 @@ typedef struct SJoinSupporter {
  SSubqueryState* pState;
  SSqlObj*        pObj;           // parent SqlObj
  int32_t         subqueryIndex;  // index of sub query
+  SInterval       interval;
  SLimitVal       limit;          // limit info
  uint64_t        uid;            // query table uid
  SArray*         colList;        // previous query information, no need to use this attribute, and the corresponding attribution
--- a/src/client/inc/tsclient.h
+++ b/src/client/inc/tsclient.h
@ -226,12 +226,8 @@ typedef struct SQueryInfo {
  int16_t          command;       // the command may be different for each subclause, so keep it seperately.
  uint32_t         type;          // query/insert type
  // TODO refactor
-  char             intervalTimeUnit;
-  char             slidingTimeUnit;
  STimeWindow      window;        // query time window
-  int64_t          intervalTime;  // aggregation time window range
-  int64_t          slidingTime;   // sliding window in mseconds
-  int64_t          intervalOffset;// start offset of each time window
+  SInterval        interval;
  int32_t          tz;            // query client timezone

  SSqlGroupbyExpr  groupbyExpr;   // group by tags info
@ -334,7 +330,7 @@ typedef struct STscObj {
  struct SSqlStream *streamList;
  void*              pDnodeConn;
  pthread_mutex_t    mutex;
-  T_REF_DECLARE();
+  T_REF_DECLARE()
 } STscObj;

 typedef struct SSqlObj {
@ -370,8 +366,6 @@ typedef struct SSqlStream {
  uint32_t streamId;
  char     listed;
  bool     isProject;
-  char     intervalTimeUnit;
-  char     slidingTimeUnit;
  int16_t  precision;
  int64_t  num;  // number of computing count

@ -385,8 +379,7 @@ typedef struct SSqlStream {
  int64_t ctime;     // stream created time
  int64_t stime;     // stream next executed time
  int64_t etime;     // stream end query time, when time is larger then etime, the stream will be closed
-  int64_t intervalTime;
-  int64_t slidingTime;
+  SInterval interval;
  void *  pTimer;

  void (*fp)();
@ -470,7 +463,7 @@ static FORCE_INLINE void tscGetResultColumnChr(SSqlRes* pRes, SFieldInfo* pField
  int32_t type = pInfo->pSqlExpr->resType;
  int32_t bytes = pInfo->pSqlExpr->resBytes;

-  char* pData = pRes->data + pInfo->pSqlExpr->offset * pRes->numOfRows + bytes * pRes->row;
+  char* pData = pRes->data + (int32_t)(pInfo->pSqlExpr->offset * pRes->numOfRows + bytes * pRes->row);

  // user defined constant value output columns
  if (TSDB_COL_IS_UD_COL(pInfo->pSqlExpr->colInfo.flag)) {
--- a/src/client/src/tscFunctionImpl.c
+++ b/src/client/src/tscFunctionImpl.c
@ -2460,11 +2460,11 @@ static void percentile_function(SQLFunctionCtx *pCtx) {
  if (pInfo->stage == 0) {
    if (pCtx->preAggVals.isSet) {
      if (pInfo->minval > pCtx->preAggVals.statis.min) {
-        pInfo->minval = pCtx->preAggVals.statis.min;
+        pInfo->minval = (double)pCtx->preAggVals.statis.min;
      }

      if (pInfo->maxval < pCtx->preAggVals.statis.max) {
-        pInfo->maxval = pCtx->preAggVals.statis.max;
+        pInfo->maxval = (double)pCtx->preAggVals.statis.max;
      }

      pInfo->numOfElems += (pCtx->size - pCtx->preAggVals.statis.numOfNull);
--- a/src/client/src/tscLocalMerge.c
+++ b/src/client/src/tscLocalMerge.c
@ -368,13 +368,12 @@ void tscCreateLocalReducer(tExtMemBuffer **pMemBuffer, int32_t numOfBuffer, tOrd
  STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
  
  TSKEY stime = (pQueryInfo->order.order == TSDB_ORDER_ASC)? pQueryInfo->window.skey : pQueryInfo->window.ekey;
-  int64_t revisedSTime =
-      taosGetIntervalStartTimestamp(stime, pQueryInfo->slidingTime, pQueryInfo->intervalTime, pQueryInfo->slidingTimeUnit, tinfo.precision);
+  int64_t revisedSTime = taosTimeTruncate(stime, &pQueryInfo->interval, tinfo.precision);
  
  if (pQueryInfo->fillType != TSDB_FILL_NONE) {
    SFillColInfo* pFillCol = createFillColInfo(pQueryInfo);
    pReducer->pFillInfo = taosInitFillInfo(pQueryInfo->order.order, revisedSTime, pQueryInfo->groupbyExpr.numOfGroupCols,
-                                           4096, (int32_t)numOfCols, pQueryInfo->slidingTime, pQueryInfo->slidingTimeUnit,
+                                           4096, (int32_t)numOfCols, pQueryInfo->interval.sliding, pQueryInfo->interval.slidingUnit,
                                           tinfo.precision, pQueryInfo->fillType, pFillCol);
  }
 }
@ -551,7 +550,7 @@ static int32_t createOrderDescriptor(tOrderDescriptor **pOrderDesc, SSqlCmd *pCm
  }

  // primary timestamp column is involved in final result
-  if (pQueryInfo->intervalTime != 0 || tscOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
+  if (pQueryInfo->interval.interval != 0 || tscOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
    numOfGroupByCols++;
  }

@ -568,7 +567,7 @@ static int32_t createOrderDescriptor(tOrderDescriptor **pOrderDesc, SSqlCmd *pCm
      orderIdx[i] = startCols++;
    }

-    if (pQueryInfo->intervalTime != 0) {
+    if (pQueryInfo->interval.interval != 0) {
      // the first column is the timestamp, handles queries like "interval(10m) group by tags"
      orderIdx[numOfGroupByCols - 1] = PRIMARYKEY_TIMESTAMP_COL_INDEX;
    }
@ -612,12 +611,12 @@ bool isSameGroup(SSqlCmd *pCmd, SLocalReducer *pReducer, char *pPrev, tFilePage
     * super table interval query
     * if the order columns is the primary timestamp, all result data belongs to one group
     */
-    assert(pQueryInfo->intervalTime > 0);
+    assert(pQueryInfo->interval.interval > 0);
    if (numOfCols == 1) {
      return true;
    }
  } else {  // simple group by query
-    assert(pQueryInfo->intervalTime == 0);
+    assert(pQueryInfo->interval.interval == 0);
  }

  // only one row exists
@ -825,8 +824,7 @@ void savePrevRecordAndSetupFillInfo(SLocalReducer *pLocalReducer, SQueryInfo *pQ

  if (pFillInfo != NULL) {
    int64_t stime = (pQueryInfo->window.skey < pQueryInfo->window.ekey) ? pQueryInfo->window.skey : pQueryInfo->window.ekey;
-    int64_t revisedSTime =
-        taosGetIntervalStartTimestamp(stime, pQueryInfo->slidingTime, pQueryInfo->intervalTime, pQueryInfo->slidingTimeUnit, tinfo.precision);
+    int64_t revisedSTime = taosTimeTruncate(stime, &pQueryInfo->interval, tinfo.precision);
  
    taosResetFillInfo(pFillInfo, revisedSTime);
  }
@ -839,7 +837,7 @@ void savePrevRecordAndSetupFillInfo(SLocalReducer *pLocalReducer, SQueryInfo *pQ
 }

 static void genFinalResWithoutFill(SSqlRes* pRes, SLocalReducer *pLocalReducer, SQueryInfo* pQueryInfo) {
-  assert(pQueryInfo->intervalTime == 0 || pQueryInfo->fillType == TSDB_FILL_NONE);
+  assert(pQueryInfo->interval.interval == 0 || pQueryInfo->fillType == TSDB_FILL_NONE);

  tFilePage * pBeforeFillData = pLocalReducer->pResultBuf;

@ -1220,7 +1218,7 @@ bool genFinalResults(SSqlObj *pSql, SLocalReducer *pLocalReducer, bool noMoreCur
 #endif

  // no interval query, no fill operation
-  if (pQueryInfo->intervalTime == 0 || pQueryInfo->fillType == TSDB_FILL_NONE) {
+  if (pQueryInfo->interval.interval == 0 || pQueryInfo->fillType == TSDB_FILL_NONE) {
    genFinalResWithoutFill(pRes, pLocalReducer, pQueryInfo);
  } else {
    SFillInfo* pFillInfo = pLocalReducer->pFillInfo;
@ -1258,13 +1256,10 @@ static void resetEnvForNewResultset(SSqlRes *pRes, SSqlCmd *pCmd, SLocalReducer
  STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, 0);
  STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
  
-  int8_t precision = tinfo.precision;
-
  // for group result interpolation, do not return if not data is generated
  if (pQueryInfo->fillType != TSDB_FILL_NONE) {
    TSKEY skey = (pQueryInfo->order.order == TSDB_ORDER_ASC)? pQueryInfo->window.skey:pQueryInfo->window.ekey;//MIN(pQueryInfo->window.skey, pQueryInfo->window.ekey);
-    int64_t newTime =
-        taosGetIntervalStartTimestamp(skey, pQueryInfo->slidingTime, pQueryInfo->intervalTime, pQueryInfo->slidingTimeUnit, precision);
+    int64_t newTime = taosTimeTruncate(skey, &pQueryInfo->interval, tinfo.precision);
    taosResetFillInfo(pLocalReducer->pFillInfo, newTime);
  }
 }
--- a/src/client/src/tscParseInsert.c
+++ b/src/client/src/tscParseInsert.c
@ -142,7 +142,7 @@ int tsParseTime(SStrToken *pToken, int64_t *time, char **next, char *error, int1
      return tscInvalidSQLErrMsg(error, "value expected in timestamp", sToken.z);
    }

-    if (getTimestampInUsFromStr(valueToken.z, valueToken.n, &interval) != TSDB_CODE_SUCCESS) {
+    if (parseAbsoluteDuration(valueToken.z, valueToken.n, &interval) != TSDB_CODE_SUCCESS) {
      return TSDB_CODE_TSC_INVALID_SQL;
    }

--- a/src/client/src/tscProfile.c
+++ b/src/client/src/tscProfile.c
@ -259,11 +259,11 @@ int tscBuildQueryStreamDesc(void *pMsg, STscObj *pObj) {
    pSdesc->num = htobe64(pStream->num);

    pSdesc->useconds = htobe64(pStream->useconds);
-    pSdesc->stime = htobe64(pStream->stime - pStream->intervalTime);
+    pSdesc->stime = htobe64(pStream->stime - pStream->interval.interval);
    pSdesc->ctime = htobe64(pStream->ctime);

-    pSdesc->slidingTime = htobe64(pStream->slidingTime);
-    pSdesc->interval = htobe64(pStream->intervalTime);
+    pSdesc->slidingTime = htobe64(pStream->interval.sliding);
+    pSdesc->interval = htobe64(pStream->interval.interval);

    pHeartbeat->numOfStreams++;
    pSdesc++;
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@ -81,6 +81,7 @@ static void setColumnOffsetValueInResultset(SQueryInfo* pQueryInfo);
 static int32_t parseGroupbyClause(SQueryInfo* pQueryInfo, tVariantList* pList, SSqlCmd* pCmd);

 static int32_t parseIntervalClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql);
+static int32_t parseOffsetClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql);
 static int32_t parseSlidingClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql);

 static int32_t addProjectionExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tSQLExprItem* pItem);
@ -595,24 +596,28 @@ int32_t parseIntervalClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQ

  // interval is not null
  SStrToken* t = &pQuerySql->interval;
-  if (parseDuration(t->z, t->n, &pQueryInfo->intervalTime, &pQueryInfo->intervalTimeUnit) != TSDB_CODE_SUCCESS) {
+  if (parseNatualDuration(t->z, t->n, &pQueryInfo->interval.interval, &pQueryInfo->interval.intervalUnit) != TSDB_CODE_SUCCESS) {
    return TSDB_CODE_TSC_INVALID_SQL;
  }

-  if (pQueryInfo->intervalTimeUnit != 'n' && pQueryInfo->intervalTimeUnit != 'y') {
+  if (pQueryInfo->interval.intervalUnit != 'n' && pQueryInfo->interval.intervalUnit != 'y') {
    // if the unit of time window value is millisecond, change the value from microsecond
    if (tinfo.precision == TSDB_TIME_PRECISION_MILLI) {
-      pQueryInfo->intervalTime = pQueryInfo->intervalTime / 1000;
+      pQueryInfo->interval.interval = pQueryInfo->interval.interval / 1000;
    }

    // interval cannot be less than 10 milliseconds
-    if (pQueryInfo->intervalTime < tsMinIntervalTime) {
+    if (pQueryInfo->interval.interval < tsMinIntervalTime) {
      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
    }
  }

  // for top/bottom + interval query, we do not add additional timestamp column in the front
  if (isTopBottomQuery(pQueryInfo)) {
+    if (parseOffsetClause(pCmd, pQueryInfo, pQuerySql) != TSDB_CODE_SUCCESS) {
+      return TSDB_CODE_TSC_INVALID_SQL;
+    }
+
    if (parseSlidingClause(pCmd, pQueryInfo, pQuerySql) != TSDB_CODE_SUCCESS) {
      return TSDB_CODE_TSC_INVALID_SQL;
    }
@ -636,7 +641,7 @@ int32_t parseIntervalClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQ
   * check invalid SQL:
   * select tbname, tags_fields from super_table_name interval(1s)
   */
-  if (tscQueryTags(pQueryInfo) && pQueryInfo->intervalTime > 0) {
+  if (tscQueryTags(pQueryInfo) && pQueryInfo->interval.interval > 0) {
    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
  }

@ -662,6 +667,10 @@ int32_t parseIntervalClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQ
  SColumnIndex index = {tableIndex, PRIMARYKEY_TIMESTAMP_COL_INDEX};
  tscAddSpecialColumnForSelect(pQueryInfo, 0, TSDB_FUNC_TS, &index, &s, TSDB_COL_NORMAL);

+  if (parseOffsetClause(pCmd, pQueryInfo, pQuerySql) != TSDB_CODE_SUCCESS) {
+    return TSDB_CODE_TSC_INVALID_SQL;
+  }
+
  if (parseSlidingClause(pCmd, pQueryInfo, pQuerySql) != TSDB_CODE_SUCCESS) {
    return TSDB_CODE_TSC_INVALID_SQL;
  }
@ -669,6 +678,57 @@ int32_t parseIntervalClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQ
  return TSDB_CODE_SUCCESS;
 }

+int32_t parseOffsetClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql) {
+  const char* msg1 = "interval offset cannot be negative";
+  const char* msg2 = "interval offset should be shorter than interval";
+  const char* msg3 = "cannot use 'year' as offset when interval is 'month'";
+
+  STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
+  STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
+
+  SStrToken* t = &pQuerySql->offset;
+  if (t->n == 0) {
+    pQueryInfo->interval.offsetUnit = pQueryInfo->interval.intervalUnit;
+    pQueryInfo->interval.offset = 0;
+    return TSDB_CODE_SUCCESS;
+  }
+
+  if (parseNatualDuration(t->z, t->n, &pQueryInfo->interval.offset, &pQueryInfo->interval.offsetUnit) != TSDB_CODE_SUCCESS) {
+    return TSDB_CODE_TSC_INVALID_SQL;
+  }
+
+  if (pQueryInfo->interval.offset < 0) {
+    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
+  }
+
+  if (pQueryInfo->interval.offsetUnit != 'n' && pQueryInfo->interval.offsetUnit != 'y') {
+    // if the unit of time window value is millisecond, change the value from microsecond
+    if (tinfo.precision == TSDB_TIME_PRECISION_MILLI) {
+      pQueryInfo->interval.offset = pQueryInfo->interval.offset / 1000;
+    }
+    if (pQueryInfo->interval.intervalUnit != 'n' && pQueryInfo->interval.intervalUnit != 'y') {
+      if (pQueryInfo->interval.offset >= pQueryInfo->interval.interval) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+      }
+    }
+  } else if (pQueryInfo->interval.offsetUnit == pQueryInfo->interval.intervalUnit) {
+    if (pQueryInfo->interval.offset >= pQueryInfo->interval.interval) {
+      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+    }
+  } else if (pQueryInfo->interval.intervalUnit == 'n' && pQueryInfo->interval.offsetUnit == 'y') {
+      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
+  } else if (pQueryInfo->interval.intervalUnit == 'y' && pQueryInfo->interval.offsetUnit == 'n') {
+    if (pQueryInfo->interval.interval * 12 <= pQueryInfo->interval.offset) {
+      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+    }
+  } else {
+    // TODO: offset should be shorter than interval, but how to check
+    // conflicts like 30days offset and 1 month interval
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t parseSlidingClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql) {
  const char* msg0 = "sliding value too small";
  const char* msg1 = "sliding value no larger than the interval value";
@ -682,29 +742,29 @@ int32_t parseSlidingClause(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SQuerySQL* pQu

  SStrToken* pSliding = &pQuerySql->sliding;
  if (pSliding->n == 0) {
-    pQueryInfo->slidingTimeUnit = pQueryInfo->intervalTimeUnit;
-    pQueryInfo->slidingTime = pQueryInfo->intervalTime;
+    pQueryInfo->interval.slidingUnit = pQueryInfo->interval.intervalUnit;
+    pQueryInfo->interval.sliding = pQueryInfo->interval.interval;
    return TSDB_CODE_SUCCESS;
  }

-  if (pQueryInfo->intervalTimeUnit == 'n' || pQueryInfo->intervalTimeUnit == 'y') {
+  if (pQueryInfo->interval.intervalUnit == 'n' || pQueryInfo->interval.intervalUnit == 'y') {
    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
  }

-  getTimestampInUsFromStr(pSliding->z, pSliding->n, &pQueryInfo->slidingTime);
+  parseAbsoluteDuration(pSliding->z, pSliding->n, &pQueryInfo->interval.sliding);
  if (tinfo.precision == TSDB_TIME_PRECISION_MILLI) {
-    pQueryInfo->slidingTime /= 1000;
+    pQueryInfo->interval.sliding /= 1000;
  }

-  if (pQueryInfo->slidingTime < tsMinSlidingTime) {
+  if (pQueryInfo->interval.sliding < tsMinSlidingTime) {
    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg0);
  }

-  if (pQueryInfo->slidingTime > pQueryInfo->intervalTime) {
+  if (pQueryInfo->interval.sliding > pQueryInfo->interval.interval) {
    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
  }

-  if ((pQueryInfo->intervalTime != 0) && (pQueryInfo->intervalTime/pQueryInfo->slidingTime > INTERVAL_SLIDING_FACTOR)) {
+  if ((pQueryInfo->interval.interval != 0) && (pQueryInfo->interval.interval/pQueryInfo->interval.sliding > INTERVAL_SLIDING_FACTOR)) {
    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
  }

@ -4716,9 +4776,9 @@ int32_t validateSqlFunctionInStreamSql(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {
  const char* msg0 = "sample interval can not be less than 10ms.";
  const char* msg1 = "functions not allowed in select clause";

-  if (pQueryInfo->intervalTime != 0 && pQueryInfo->intervalTime < 10 &&
-     pQueryInfo->intervalTimeUnit != 'n' &&
-     pQueryInfo->intervalTimeUnit != 'y') {
+  if (pQueryInfo->interval.interval != 0 && pQueryInfo->interval.interval < 10 &&
+     pQueryInfo->interval.intervalUnit != 'n' &&
+     pQueryInfo->interval.intervalUnit != 'y') {
    return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg0);
  }
  
@ -5503,7 +5563,7 @@ static int32_t doAddGroupbyColumnsOnDemand(SSqlCmd* pCmd, SQueryInfo* pQueryInfo
      insertResultField(pQueryInfo, (int32_t)size, &ids, bytes, (int8_t)type, name, pExpr);
    } else {
      // if this query is "group by" normal column, interval is not allowed
-      if (pQueryInfo->intervalTime > 0) {
+      if (pQueryInfo->interval.interval > 0) {
        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
      }

@ -5536,7 +5596,7 @@ int32_t doFunctionsCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {

  // only retrieve tags, group by is not supportted
  if (tscQueryTags(pQueryInfo)) {
-    if (pQueryInfo->groupbyExpr.numOfGroupCols > 0 || pQueryInfo->intervalTime > 0) {
+    if (pQueryInfo->groupbyExpr.numOfGroupCols > 0 || pQueryInfo->interval.interval > 0) {
      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg4);
    } else {
      return TSDB_CODE_SUCCESS;
@ -5988,7 +6048,7 @@ int32_t doCheckForStream(SSqlObj* pSql, SSqlInfo* pInfo) {
  if (parseIntervalClause(pCmd, pQueryInfo, pQuerySql) != TSDB_CODE_SUCCESS) {
    return TSDB_CODE_TSC_INVALID_SQL;
  } else {
-    if ((pQueryInfo->intervalTime > 0) &&
+    if ((pQueryInfo->interval.interval > 0) &&
        (validateFunctionsInIntervalOrGroupbyQuery(pCmd, pQueryInfo) != TSDB_CODE_SUCCESS)) {
      return TSDB_CODE_TSC_INVALID_SQL;
    }
@ -6018,7 +6078,7 @@ int32_t doCheckForStream(SSqlObj* pSql, SSqlInfo* pInfo) {
   * not here.
   */
  if (pQuerySql->fillType != NULL) {
-    if (pQueryInfo->intervalTime == 0) {
+    if (pQueryInfo->interval.interval == 0) {
      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
    }

@ -6186,7 +6246,7 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
  if (parseIntervalClause(pCmd, pQueryInfo, pQuerySql) != TSDB_CODE_SUCCESS) {
    return TSDB_CODE_TSC_INVALID_SQL;
  } else {
-    if ((pQueryInfo->intervalTime > 0) &&
+    if ((pQueryInfo->interval.interval > 0) &&
        (validateFunctionsInIntervalOrGroupbyQuery(pCmd, pQueryInfo) != TSDB_CODE_SUCCESS)) {
      return TSDB_CODE_TSC_INVALID_SQL;
    }
@ -6237,12 +6297,11 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
   * the columns may be increased due to group by operation
   */
  if (pQuerySql->fillType != NULL) {
-    if (pQueryInfo->intervalTime == 0 && (!tscIsPointInterpQuery(pQueryInfo))) {
+    if (pQueryInfo->interval.interval == 0 && (!tscIsPointInterpQuery(pQueryInfo))) {
      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg5);
    }

-    if (pQueryInfo->intervalTime > 0 && pQueryInfo->intervalTimeUnit != 'n' && pQueryInfo->intervalTimeUnit != 'y') {
-      // to avoid data overflow
+    if (pQueryInfo->interval.interval > 0 && pQueryInfo->interval.intervalUnit != 'n' && pQueryInfo->interval.intervalUnit != 'y') {
      bool initialWindows = TSWINDOW_IS_EQUAL(pQueryInfo->window, TSWINDOW_INITIALIZER);
      if (initialWindows) {
        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg6);
@ -6250,7 +6309,7 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {

      int64_t timeRange = ABS(pQueryInfo->window.skey - pQueryInfo->window.ekey);
      // number of result is not greater than 10,000,000
-      if ((timeRange == 0) || (timeRange / pQueryInfo->intervalTime) > MAX_INTERVAL_TIME_WINDOW) {
+      if ((timeRange == 0) || (timeRange / pQueryInfo->interval.interval) > MAX_INTERVAL_TIME_WINDOW) {
        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg6);
      }
    }
@ -6393,4 +6452,4 @@ bool hasNormalColumnFilter(SQueryInfo* pQueryInfo) {
  }

  return false;
-}
+}
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@ -647,8 +647,8 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
    return TSDB_CODE_TSC_INVALID_SQL;
  }
  
-  if (pQueryInfo->intervalTime < 0) {
-    tscError("%p illegal value of aggregation time interval in query msg: %ld", pSql, pQueryInfo->intervalTime);
+  if (pQueryInfo->interval.interval < 0) {
+    tscError("%p illegal value of aggregation time interval in query msg: %ld", pSql, pQueryInfo->interval.interval);
    return TSDB_CODE_TSC_INVALID_SQL;
  }
  
@ -675,10 +675,12 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
  pQueryMsg->limit          = htobe64(pQueryInfo->limit.limit);
  pQueryMsg->offset         = htobe64(pQueryInfo->limit.offset);
  pQueryMsg->numOfCols      = htons((int16_t)taosArrayGetSize(pQueryInfo->colList));
-  pQueryMsg->intervalTime   = htobe64(pQueryInfo->intervalTime);
-  pQueryMsg->slidingTime    = htobe64(pQueryInfo->slidingTime);
-  pQueryMsg->intervalTimeUnit = pQueryInfo->intervalTimeUnit;
-  pQueryMsg->slidingTimeUnit = pQueryInfo->slidingTimeUnit;
+  pQueryMsg->interval.interval   = htobe64(pQueryInfo->interval.interval);
+  pQueryMsg->interval.sliding   = htobe64(pQueryInfo->interval.sliding);
+  pQueryMsg->interval.offset   = htobe64(pQueryInfo->interval.offset);
+  pQueryMsg->interval.intervalUnit = pQueryInfo->interval.intervalUnit;
+  pQueryMsg->interval.slidingUnit = pQueryInfo->interval.slidingUnit;
+  pQueryMsg->interval.offsetUnit = pQueryInfo->interval.offsetUnit;
  pQueryMsg->numOfGroupCols = htons(pQueryInfo->groupbyExpr.numOfGroupCols);
  pQueryMsg->numOfTags      = htonl(numOfTags);
  pQueryMsg->tagNameRelType = htons(pQueryInfo->tagCond.relType);
--- a/src/client/src/tscStream.c
+++ b/src/client/src/tscStream.c
@ -51,7 +51,7 @@ static int64_t tscGetRetryDelayTime(SSqlStream* pStream, int64_t slidingTime, in
  int64_t retryDelta = (int64_t)(tsStreamCompRetryDelay * retryRangeFactor);
  retryDelta = ((rand() % retryDelta) + tsStreamCompRetryDelay) * 1000L;

-  if (pStream->intervalTimeUnit != 'n' && pStream->intervalTimeUnit != 'y') {
+  if (pStream->interval.intervalUnit != 'n' && pStream->interval.intervalUnit != 'y') {
    // change to ms
    if (prec == TSDB_TIME_PRECISION_MICRO) {
      slidingTime = slidingTime / 1000;
@ -87,7 +87,7 @@ static void tscProcessStreamLaunchQuery(SSchedMsg *pMsg) {

  // failed to get meter/metric meta, retry in 10sec.
  if (code != TSDB_CODE_SUCCESS) {
-    int64_t retryDelayTime = tscGetRetryDelayTime(pStream, pStream->slidingTime, pStream->precision);
+    int64_t retryDelayTime = tscGetRetryDelayTime(pStream, pStream->interval.sliding, pStream->precision);
    tscDebug("%p stream:%p,get metermeta failed, retry in %" PRId64 "ms", pStream->pSql, pStream, retryDelayTime);
    tscSetRetryTimer(pStream, pSql, retryDelayTime);

@ -132,15 +132,16 @@ static void tscProcessStreamTimer(void *handle, void *tmrId) {
    }
    if (etime > pStream->etime) {
      etime = pStream->etime;
-    } else if (pStream->intervalTimeUnit != 'y' && pStream->intervalTimeUnit != 'n') {
-      etime = pStream->stime + (etime - pStream->stime) / pStream->intervalTime * pStream->intervalTime;
+    } else if (pStream->interval.intervalUnit != 'y' && pStream->interval.intervalUnit != 'n') {
+      etime = pStream->stime + (etime - pStream->stime) / pStream->interval.interval * pStream->interval.interval;
    } else {
-      etime = taosGetIntervalStartTimestamp(etime, pStream->slidingTime, pStream->intervalTime, pStream->slidingTimeUnit, pStream->precision);
+      etime = taosTimeTruncate(etime, &pStream->interval, pStream->precision);
+      //etime = taosGetIntervalStartTimestamp(etime, pStream->interval.sliding, pStream->interval.sliding, pStream->interval.slidingUnit, pStream->precision);
    }
    pQueryInfo->window.ekey = etime;
    if (pQueryInfo->window.skey >= pQueryInfo->window.ekey) {
-      int64_t timer = pStream->slidingTime;
-      if (pStream->intervalTimeUnit == 'y' || pStream->intervalTimeUnit == 'n') {
+      int64_t timer = pStream->interval.sliding;
+      if (pStream->interval.intervalUnit == 'y' || pStream->interval.intervalUnit == 'n') {
        timer = 86400 * 1000l;
      } else if (pStream->precision == TSDB_TIME_PRECISION_MICRO) {
        timer /= 1000l;
@ -162,7 +163,7 @@ static void tscProcessStreamTimer(void *handle, void *tmrId) {
 static void tscProcessStreamQueryCallback(void *param, TAOS_RES *tres, int numOfRows) {
  SSqlStream *pStream = (SSqlStream *)param;
  if (tres == NULL || numOfRows < 0) {
-    int64_t retryDelay = tscGetRetryDelayTime(pStream, pStream->slidingTime, pStream->precision);
+    int64_t retryDelay = tscGetRetryDelayTime(pStream, pStream->interval.sliding, pStream->precision);
    tscError("%p stream:%p, query data failed, code:0x%08x, retry in %" PRId64 "ms", pStream->pSql, pStream, numOfRows,
             retryDelay);

@ -223,7 +224,7 @@ static void tscProcessStreamRetrieveResult(void *param, TAOS_RES *res, int numOf
  SSqlObj *       pSql = (SSqlObj *)res;

  if (pSql == NULL || numOfRows < 0) {
-    int64_t retryDelayTime = tscGetRetryDelayTime(pStream, pStream->slidingTime, pStream->precision);
+    int64_t retryDelayTime = tscGetRetryDelayTime(pStream, pStream->interval.sliding, pStream->precision);
    tscError("%p stream:%p, retrieve data failed, code:0x%08x, retry in %" PRId64 "ms", pSql, pStream, numOfRows, retryDelayTime);
  
    tscSetRetryTimer(pStream, pStream->pSql, retryDelayTime);
@ -246,11 +247,7 @@ static void tscProcessStreamRetrieveResult(void *param, TAOS_RES *res, int numOf
    }

    if (!pStream->isProject) {
-      if (pStream->intervalTimeUnit == 'y' || pStream->intervalTimeUnit == 'n') {
-        pStream->stime = taosAddNatualInterval(pStream->stime, pStream->slidingTime, pStream->slidingTimeUnit, pStream->precision);
-      } else {
-        pStream->stime += pStream->slidingTime;
-      }
+      pStream->stime = taosTimeAdd(pStream->stime, pStream->interval.sliding, pStream->interval.slidingUnit, pStream->precision);
    }
    // actually only one row is returned. this following is not necessary
    taos_fetch_rows_a(res, tscProcessStreamRetrieveResult, pStream);
@ -310,7 +307,7 @@ static void tscSetRetryTimer(SSqlStream *pStream, SSqlObj *pSql, int64_t timer)
             now + timer, timer, delay, pStream->stime, etime);
  } else {
    tscDebug("%p stream:%p, next start at %" PRId64 ", in %" PRId64 "ms. delay:%" PRId64 "ms qrange %" PRId64 "-%" PRId64, pStream->pSql, pStream,
-             pStream->stime, timer, delay, pStream->stime - pStream->intervalTime, pStream->stime - 1);
+             pStream->stime, timer, delay, pStream->stime - pStream->interval.interval, pStream->stime - 1);
  }

  pSql->cmd.command = TSDB_SQL_SELECT;
@ -324,12 +321,12 @@ static int64_t getLaunchTimeDelay(const SSqlStream* pStream) {
      (pStream->precision == TSDB_TIME_PRECISION_MICRO) ? tsMaxStreamComputDelay * 1000L : tsMaxStreamComputDelay;
  
  int64_t delayDelta = maxDelay;
-  if (pStream->intervalTimeUnit != 'n' && pStream->intervalTimeUnit != 'y') {
-    delayDelta = (int64_t)(pStream->slidingTime * tsStreamComputDelayRatio);
+  if (pStream->interval.intervalUnit != 'n' && pStream->interval.intervalUnit != 'y') {
+    delayDelta = (int64_t)(pStream->interval.sliding * tsStreamComputDelayRatio);
    if (delayDelta > maxDelay) {
      delayDelta = maxDelay;
    }
-    int64_t remainTimeWindow = pStream->slidingTime - delayDelta;
+    int64_t remainTimeWindow = pStream->interval.sliding - delayDelta;
    if (maxDelay > remainTimeWindow) {
      maxDelay = (int64_t)(remainTimeWindow / 1.5f);
    }
@ -337,8 +334,8 @@ static int64_t getLaunchTimeDelay(const SSqlStream* pStream) {
  
  int64_t currentDelay = (rand() % maxDelay);  // a random number
  currentDelay += delayDelta;
-  if (pStream->intervalTimeUnit != 'n' && pStream->intervalTimeUnit != 'y') {
-    assert(currentDelay < pStream->slidingTime);
+  if (pStream->interval.intervalUnit != 'n' && pStream->interval.intervalUnit != 'y') {
+    assert(currentDelay < pStream->interval.sliding);
  }
  
  return currentDelay;
@ -353,7 +350,7 @@ static void tscSetNextLaunchTimer(SSqlStream *pStream, SSqlObj *pSql) {
     * for project query, no mater fetch data successfully or not, next launch will issue
     * more than the sliding time window
     */
-    timer = pStream->slidingTime;
+    timer = pStream->interval.sliding;
    if (pStream->stime > pStream->etime) {
      tscDebug("%p stream:%p, stime:%" PRId64 " is larger than end time: %" PRId64 ", stop the stream", pStream->pSql, pStream,
               pStream->stime, pStream->etime);
@ -366,7 +363,8 @@ static void tscSetNextLaunchTimer(SSqlStream *pStream, SSqlObj *pSql) {
      return;
    }
  } else {
-    int64_t stime = taosGetIntervalStartTimestamp(pStream->stime - 1, pStream->intervalTime, pStream->intervalTime, pStream->intervalTimeUnit, pStream->precision);
+    int64_t stime = taosTimeTruncate(pStream->stime - 1, &pStream->interval, pStream->precision);
+    //int64_t stime = taosGetIntervalStartTimestamp(pStream->stime - 1, pStream->interval.interval, pStream->interval.interval, pStream->interval.intervalUnit, pStream->precision);
    if (stime >= pStream->etime) {
      tscDebug("%p stream:%p, stime:%" PRId64 " is larger than end time: %" PRId64 ", stop the stream", pStream->pSql, pStream,
               pStream->stime, pStream->etime);
@ -400,43 +398,43 @@ static void tscSetSlidingWindowInfo(SSqlObj *pSql, SSqlStream *pStream) {
  
  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
  
-  if (pQueryInfo->intervalTimeUnit != 'n' && pQueryInfo->intervalTimeUnit != 'y' && pQueryInfo->intervalTime < minIntervalTime) {
+  if (pQueryInfo->interval.intervalUnit != 'n' && pQueryInfo->interval.intervalUnit!= 'y' && pQueryInfo->interval.interval < minIntervalTime) {
    tscWarn("%p stream:%p, original sample interval:%ld too small, reset to:%" PRId64, pSql, pStream,
-            pQueryInfo->intervalTime, minIntervalTime);
-    pQueryInfo->intervalTime = minIntervalTime;
+            pQueryInfo->interval.interval, minIntervalTime);
+    pQueryInfo->interval.interval = minIntervalTime;
  }

-  pStream->intervalTimeUnit = pQueryInfo->intervalTimeUnit;
-  pStream->intervalTime = pQueryInfo->intervalTime;  // it shall be derived from sql string
+  pStream->interval.intervalUnit = pQueryInfo->interval.intervalUnit;
+  pStream->interval.interval = pQueryInfo->interval.interval;  // it shall be derived from sql string

-  if (pQueryInfo->slidingTime <= 0) {
-    pQueryInfo->slidingTime = pQueryInfo->intervalTime;
-    pQueryInfo->slidingTimeUnit = pQueryInfo->intervalTimeUnit;
+  if (pQueryInfo->interval.sliding <= 0) {
+    pQueryInfo->interval.sliding = pQueryInfo->interval.interval;
+    pQueryInfo->interval.slidingUnit = pQueryInfo->interval.intervalUnit;
  }

  int64_t minSlidingTime =
      (pStream->precision == TSDB_TIME_PRECISION_MICRO) ? tsMinSlidingTime * 1000L : tsMinSlidingTime;

-  if (pQueryInfo->intervalTimeUnit != 'n' && pQueryInfo->intervalTimeUnit != 'y' && pQueryInfo->slidingTime < minSlidingTime) {
+  if (pQueryInfo->interval.intervalUnit != 'n' && pQueryInfo->interval.intervalUnit!= 'y' && pQueryInfo->interval.sliding < minSlidingTime) {
    tscWarn("%p stream:%p, original sliding value:%" PRId64 " too small, reset to:%" PRId64, pSql, pStream,
-        pQueryInfo->slidingTime, minSlidingTime);
+        pQueryInfo->interval.sliding, minSlidingTime);

-    pQueryInfo->slidingTime = minSlidingTime;
+    pQueryInfo->interval.sliding = minSlidingTime;
  }

-  if (pQueryInfo->slidingTime > pQueryInfo->intervalTime) {
+  if (pQueryInfo->interval.sliding > pQueryInfo->interval.interval) {
    tscWarn("%p stream:%p, sliding value:%" PRId64 " can not be larger than interval range, reset to:%" PRId64, pSql, pStream,
-            pQueryInfo->slidingTime, pQueryInfo->intervalTime);
+            pQueryInfo->interval.sliding, pQueryInfo->interval.interval);

-    pQueryInfo->slidingTime = pQueryInfo->intervalTime;
+    pQueryInfo->interval.sliding = pQueryInfo->interval.interval;
  }

-  pStream->slidingTimeUnit = pQueryInfo->slidingTimeUnit;
-  pStream->slidingTime = pQueryInfo->slidingTime;
+  pStream->interval.slidingUnit = pQueryInfo->interval.slidingUnit;
+  pStream->interval.sliding = pQueryInfo->interval.sliding;
  
  if (pStream->isProject) {
-    pQueryInfo->intervalTime = 0; // clear the interval value to avoid the force time window split by query processor
-    pQueryInfo->slidingTime = 0;
+    pQueryInfo->interval.interval = 0; // clear the interval value to avoid the force time window split by query processor
+    pQueryInfo->interval.sliding = 0;
  }
 }

@ -445,8 +443,8 @@ static int64_t tscGetStreamStartTimestamp(SSqlObj *pSql, SSqlStream *pStream, in
  
  if (pStream->isProject) {
    // no data in table, flush all data till now to destination meter, 10sec delay
-    pStream->intervalTime = tsProjectExecInterval;
-    pStream->slidingTime = tsProjectExecInterval;
+    pStream->interval.interval = tsProjectExecInterval;
+    pStream->interval.sliding = tsProjectExecInterval;

    if (stime != 0) {  // first projection start from the latest event timestamp
      assert(stime >= pQueryInfo->window.skey);
@ -459,12 +457,15 @@ static int64_t tscGetStreamStartTimestamp(SSqlObj *pSql, SSqlStream *pStream, in
      stime = pQueryInfo->window.skey;
      if (stime == INT64_MIN) {
        stime = (int64_t)taosGetTimestamp(pStream->precision);
-        stime = taosGetIntervalStartTimestamp(stime, pStream->intervalTime, pStream->intervalTime, pStream->intervalTimeUnit, pStream->precision);
-        stime = taosGetIntervalStartTimestamp(stime - 1, pStream->intervalTime, pStream->intervalTime, pStream->intervalTimeUnit, pStream->precision);
+        stime = taosTimeTruncate(stime, &pStream->interval, pStream->precision);
+        stime = taosTimeTruncate(stime - 1, &pStream->interval, pStream->precision);
+        //stime = taosGetIntervalStartTimestamp(stime, pStream->interval.interval, pStream->interval.interval, pStream->interval.intervalUnit, pStream->precision);
+        //stime = taosGetIntervalStartTimestamp(stime - 1, pStream->interval.interval, pStream->interval.interval, pStream->interval.intervalUnit, pStream->precision);
        tscWarn("%p stream:%p, last timestamp:0, reset to:%" PRId64, pSql, pStream, stime);
      }
    } else {
-      int64_t newStime = taosGetIntervalStartTimestamp(stime, pStream->intervalTime, pStream->intervalTime, pStream->intervalTimeUnit, pStream->precision);
+      //int64_t newStime = taosGetIntervalStartTimestamp(stime, pStream->interval.interval, pStream->interval.interval, pStream->interval.intervalUnit, pStream->precision);
+      int64_t newStime = taosTimeTruncate(stime, &pStream->interval, pStream->precision);
      if (newStime != stime) {
        tscWarn("%p stream:%p, last timestamp:%" PRId64 ", reset to:%" PRId64, pSql, pStream, stime, newStime);
        stime = newStime;
@ -534,7 +535,7 @@ static void tscCreateStream(void *param, TAOS_RES *res, int code) {
  taosTmrReset(tscProcessStreamTimer, (int32_t)starttime, pStream, tscTmr, &pStream->pTimer);

  tscDebug("%p stream:%p is opened, query on:%s, interval:%" PRId64 ", sliding:%" PRId64 ", first launched in:%" PRId64 ", sql:%s", pSql,
-           pStream, pTableMetaInfo->name, pStream->intervalTime, pStream->slidingTime, starttime, pSql->sqlstr);
+           pStream, pTableMetaInfo->name, pStream->interval.interval, pStream->interval.sliding, starttime, pSql->sqlstr);
 }

 TAOS_STREAM *taos_open_stream(TAOS *taos, const char *sqlstr, void (*fp)(void *param, TAOS_RES *, TAOS_ROW row),
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@ -113,7 +113,7 @@ static int64_t doTSBlockIntersect(SSqlObj* pSql, SJoinSupporter* pSupporter1, SJ
       * in case of stable query, limit/offset is not applied here. the limit/offset is applied to the
       * final results which is acquired after the secondry merge of in the client.
       */
-      if (pLimit->offset == 0 || pQueryInfo->intervalTime > 0 || QUERY_IS_STABLE_QUERY(pQueryInfo->type)) {
+      if (pLimit->offset == 0 || pQueryInfo->interval.interval > 0 || QUERY_IS_STABLE_QUERY(pQueryInfo->type)) {
        if (win->skey > elem1.ts) {
          win->skey = elem1.ts;
        }
@ -178,6 +178,7 @@ SJoinSupporter* tscCreateJoinSupporter(SSqlObj* pSql, SSubqueryState* pState, in
  pSupporter->subqueryIndex = index;
  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, pSql->cmd.clauseIndex);
  
+  memcpy(&pSupporter->interval, &pQueryInfo->interval, sizeof(pSupporter->interval));
  pSupporter->limit = pQueryInfo->limit;

  STableMetaInfo* pTableMetaInfo = tscGetTableMetaInfoFromCmd(&pSql->cmd, pSql->cmd.clauseIndex, index);
@ -297,18 +298,20 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
      success = false;
      break;
    }
-  
+
    tscClearSubqueryInfo(&pNew->cmd);
    pSql->pSubs[i] = pNew;
  
    SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(&pNew->cmd, 0);
    pQueryInfo->tsBuf = pTSBuf;  // transfer the ownership of timestamp comp-z data to the new created object
-  
+
    // set the second stage sub query for join process
    TSDB_QUERY_SET_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_SEC_STAGE);

+    memcpy(&pQueryInfo->interval, &pSupporter->interval, sizeof(pQueryInfo->interval));
+
    tscTagCondCopy(&pQueryInfo->tagCond, &pSupporter->tagCond);
-  
+
    pQueryInfo->colList = pSupporter->colList;
    pQueryInfo->exprList = pSupporter->exprList;
    pQueryInfo->fieldsInfo = pSupporter->fieldsInfo;
@ -1204,7 +1207,7 @@ int32_t tscCreateJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter
    }

    pNew->cmd.numOfCols = 0;
-    pNewQueryInfo->intervalTime = 0;
+    pNewQueryInfo->interval.interval = 0;
    pSupporter->limit = pNewQueryInfo->limit;

    pNewQueryInfo->limit.limit = -1;
@ -1950,7 +1953,7 @@ int32_t tscHandleMultivnodeInsert(SSqlObj *pSql) {
  SSqlCmd *pCmd = &pSql->cmd;
  SSqlRes *pRes = &pSql->res;

-  pSql->numOfSubs = taosArrayGetSize(pCmd->pDataBlocks);
+  pSql->numOfSubs = (uint16_t)taosArrayGetSize(pCmd->pDataBlocks);
  assert(pSql->numOfSubs > 0);

  pRes->code = TSDB_CODE_SUCCESS;
@ -2185,7 +2188,7 @@ void **doSetResultRowData(SSqlObj *pSql, bool finalResult) {
    }

    // primary key column cannot be null in interval query, no need to check
-    if (i == 0 && pQueryInfo->intervalTime > 0) {
+    if (i == 0 && pQueryInfo->interval.interval > 0) {
      continue;
    }

--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@ -1849,6 +1849,7 @@ static void doSetSqlExprAndResultFieldInfo(SQueryInfo* pQueryInfo, SQueryInfo* p
    }

    assert(matched);
+    (void)matched;
  }

  tscFieldInfoUpdateOffset(pNewQueryInfo);
@ -1899,10 +1900,7 @@ SSqlObj* createSubqueryObj(SSqlObj* pSql, int16_t tableIndex, void (*fp)(), void
  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);

  pNewQueryInfo->command = pQueryInfo->command;
-  pNewQueryInfo->intervalTimeUnit = pQueryInfo->intervalTimeUnit;
-  pNewQueryInfo->slidingTimeUnit = pQueryInfo->slidingTimeUnit;
-  pNewQueryInfo->intervalTime = pQueryInfo->intervalTime;
-  pNewQueryInfo->slidingTime  = pQueryInfo->slidingTime;
+  memcpy(&pNewQueryInfo->interval, &pQueryInfo->interval, sizeof(pNewQueryInfo->interval));
  pNewQueryInfo->type   = pQueryInfo->type;
  pNewQueryInfo->window = pQueryInfo->window;
  pNewQueryInfo->limit  = pQueryInfo->limit;
--- a/src/common/inc/tname.h
+++ b/src/common/inc/tname.h
@ -35,8 +35,6 @@ bool tscValidateTableNameLength(size_t len);

 SColumnFilterInfo* tscFilterInfoClone(const SColumnFilterInfo* src, int32_t numOfFilters);

-int64_t taosAddNatualInterval(int64_t key, int64_t intervalTime, char timeUnit, int16_t precision);
-int32_t taosCountNatualInterval(int64_t skey, int64_t ekey, int64_t intervalTime, char timeUnit, int16_t precision);
-int64_t taosGetIntervalStartTimestamp(int64_t startTime, int64_t slidingTime, int64_t intervalTime, char timeUnit, int16_t precision);
+// int64_t taosGetIntervalStartTimestamp(int64_t startTime, int64_t slidingTime, int64_t intervalTime, char timeUnit, int16_t precision);

 #endif  // TDENGINE_NAME_H
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@ -957,17 +957,6 @@ static void doInitGlobalConfig(void) {
  cfg.unitType = TAOS_CFG_UTYPE_NONE;
  taosInitConfigOption(cfg);

-  // http configs
-  cfg.option = "httpCacheSessions";
-  cfg.ptr = &tsHttpCacheSessions;
-  cfg.valType = TAOS_CFG_VTYPE_INT32;
-  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG;
-  cfg.minValue = 1;
-  cfg.maxValue = 100000;
-  cfg.ptrLength = 0;
-  cfg.unitType = TAOS_CFG_UTYPE_NONE;
-  taosInitConfigOption(cfg);
-
  cfg.option = "httpEnableRecordSql";
  cfg.ptr = &tsHttpEnableRecordSql;
  cfg.valType = TAOS_CFG_VTYPE_INT32;
--- a/src/common/src/tname.c
+++ b/src/common/src/tname.c
@ -99,62 +99,7 @@ SColumnFilterInfo* tscFilterInfoClone(const SColumnFilterInfo* src, int32_t numO
  return pFilter;
 }

-int64_t taosAddNatualInterval(int64_t key, int64_t intervalTime, char timeUnit, int16_t precision) {
-  key /= 1000;
-  if (precision == TSDB_TIME_PRECISION_MICRO) {
-    key /= 1000;
-  }
-
-  struct tm tm;
-  time_t t = (time_t)key;
-  localtime_r(&t, &tm);
-
-  if (timeUnit == 'y') {
-    intervalTime *= 12;
-  }
-
-  int mon = (int)(tm.tm_year * 12 + tm.tm_mon + intervalTime);
-  tm.tm_year = mon / 12;
-  tm.tm_mon = mon % 12;
-
-  key = mktime(&tm) * 1000L;
-
-  if (precision == TSDB_TIME_PRECISION_MICRO) {
-    key *= 1000L;
-  }
-
-  return key;
-}
-
-int32_t taosCountNatualInterval(int64_t skey, int64_t ekey, int64_t intervalTime, char timeUnit, int16_t precision) {
-  skey /= 1000;
-  ekey /= 1000;
-  if (precision == TSDB_TIME_PRECISION_MICRO) {
-    skey /= 1000;
-    ekey /= 1000;
-  }
-  if (ekey < skey) {
-    int64_t tmp = ekey;
-    ekey = skey;
-    skey = tmp;
-  }
-
-  struct tm tm;
-  time_t t = (time_t)skey;
-  localtime_r(&t, &tm);
-  int smon = tm.tm_year * 12 + tm.tm_mon;
-
-  t = (time_t)ekey;
-  localtime_r(&t, &tm);
-  int emon = tm.tm_year * 12 + tm.tm_mon;
-
-  if (timeUnit == 'y') {
-    intervalTime *= 12;
-  }
-
-  return (emon - smon) / (int32_t)intervalTime;
-}
-
+#if 0
 int64_t taosGetIntervalStartTimestamp(int64_t startTime, int64_t slidingTime, int64_t intervalTime, char timeUnit, int16_t precision) {
  if (slidingTime == 0) {
    return startTime;
@ -219,6 +164,8 @@ int64_t taosGetIntervalStartTimestamp(int64_t startTime, int64_t slidingTime, in
  return start;
 }

+#endif
+
 /*
 * tablePrefix.columnName
 * extract table name and save it in pTable, with only column name in pToken
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@ -101,6 +101,7 @@ extern const int32_t TYPE_BYTES[11];
 #define TSDB_TIME_PRECISION_MILLI 0
 #define TSDB_TIME_PRECISION_MICRO 1
 #define TSDB_TIME_PRECISION_NANO  2
+#define TSDB_TICK_PER_SECOND(precision) ((precision)==TSDB_TIME_PRECISION_MILLI ? 1e3L : ((precision)==TSDB_TIME_PRECISION_MICRO ? 1e6L : 1e9L))

 #define TSDB_TIME_PRECISION_MILLI_STR "ms"
 #define TSDB_TIME_PRECISION_MICRO_STR "us"
--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
@ -460,11 +460,7 @@ typedef struct {
  int16_t     order;
  int16_t     orderColId;
  int16_t     numOfCols;        // the number of columns will be load from vnode
-  int64_t     intervalTime;     // time interval for aggregation, in million second
-  int64_t     intervalOffset;   // start offset for interval query
-  int64_t     slidingTime;      // value for sliding window
-  char        intervalTimeUnit;
-  char        slidingTimeUnit;  // time interval type, for revisement of interval(1d)
+  SInterval   interval;
  uint16_t    tagCondLen;       // tag length in current query
  int16_t     numOfGroupCols;   // num of group by columns
  int16_t     orderByIdx;
--- a/src/kit/shell/src/shellEngine.c
+++ b/src/kit/shell/src/shellEngine.c
@ -765,7 +765,9 @@ void read_history() {
  FILE *f = fopen(f_history, "r");
  if (f == NULL) {
 #ifndef WINDOWS
-    fprintf(stderr, "Failed to open file %s\n", f_history);
+    if (errno != ENOENT) {
+      fprintf(stderr, "Failed to open file %s, reason:%s\n", f_history, strerror(errno));
+    }
 #endif    
    return;
  }
@ -792,7 +794,7 @@ void write_history() {
  FILE *f = fopen(f_history, "w");
  if (f == NULL) {
 #ifndef WINDOWS    
-    fprintf(stderr, "Failed to open file %s for write\n", f_history);
+    fprintf(stderr, "Failed to open file %s for write, reason:%s\n", f_history, strerror(errno));
 #endif    
    return;
  }
--- a/src/os/inc/osTime.h
+++ b/src/os/inc/osTime.h
@ -30,8 +30,6 @@ extern "C" {
 #define MILLISECOND_PER_HOUR   (MILLISECOND_PER_MINUTE * 60)
 #define MILLISECOND_PER_DAY    (MILLISECOND_PER_HOUR * 24)
 #define MILLISECOND_PER_WEEK   (MILLISECOND_PER_DAY * 7)
-#define MILLISECOND_PER_MONTH  (MILLISECOND_PER_DAY * 30)
-#define MILLISECOND_PER_YEAR   (MILLISECOND_PER_DAY * 365)

 //@return timestamp in second
 int32_t taosGetTimestampSec();
@ -63,8 +61,22 @@ static FORCE_INLINE int64_t taosGetTimestamp(int32_t precision) {
  }
 }

-int32_t getTimestampInUsFromStr(char* token, int32_t tokenlen, int64_t* ts);
-int32_t parseDuration(const char* token, int32_t tokenLen, int64_t* duration, char* unit);
+
+typedef struct SInterval {
+  char intervalUnit;
+  char slidingUnit;
+  char offsetUnit;
+  int64_t interval;
+  int64_t sliding;
+  int64_t offset;
+} SInterval;
+
+int64_t taosTimeAdd(int64_t t, int64_t duration, char unit, int32_t precision);
+int64_t taosTimeTruncate(int64_t t, const SInterval* pInterval, int32_t precision);
+int32_t taosTimeCountInterval(int64_t skey, int64_t ekey, int64_t interval, char unit, int32_t precision);
+
+int32_t parseAbsoluteDuration(char* token, int32_t tokenlen, int64_t* ts);
+int32_t parseNatualDuration(const char* token, int32_t tokenLen, int64_t* duration, char* unit);

 int32_t taosParseTime(char* timestr, int64_t* time, int32_t len, int32_t timePrec, int8_t dayligth);
 void deltaToUtcInitOnce();
--- a/src/os/src/detail/osTime.c
+++ b/src/os/src/detail/osTime.c
@ -321,7 +321,7 @@ int32_t parseLocaltimeWithDst(char* timestr, int64_t* time, int32_t timePrec) {
 }


-static int32_t getTimestampInUsFromStrImpl(int64_t val, char unit, int64_t* result) {
+static int32_t getDurationInUs(int64_t val, char unit, int64_t* result) {
  *result = val;

  int64_t factor = 1000L;
@ -342,19 +342,12 @@ static int32_t getTimestampInUsFromStrImpl(int64_t val, char unit, int64_t* resu
    case 'w':
      (*result) *= MILLISECOND_PER_WEEK*factor;
      break;
-    case 'n':
-      (*result) *= MILLISECOND_PER_MONTH*factor;
-      break;
-    case 'y':
-      (*result) *= MILLISECOND_PER_YEAR*factor;
-      break;
    case 'a':
      (*result) *= factor;
      break;
    case 'u':
      break;
    default: {
-      ;
      return -1;
    }
  }
@ -373,7 +366,7 @@ static int32_t getTimestampInUsFromStrImpl(int64_t val, char unit, int64_t* resu
 * n - Months (30 days)
 * y - Years (365 days)
 */
-int32_t getTimestampInUsFromStr(char* token, int32_t tokenlen, int64_t* ts) {
+int32_t parseAbsoluteDuration(char* token, int32_t tokenlen, int64_t* duration) {
  errno = 0;
  char* endPtr = NULL;

@ -383,10 +376,16 @@ int32_t getTimestampInUsFromStr(char* token, int32_t tokenlen, int64_t* ts) {
    return -1;
  }

-  return getTimestampInUsFromStrImpl(timestamp, token[tokenlen - 1], ts);
+  /* natual month/year are not allowed in absolute duration */
+  char unit = token[tokenlen - 1];
+  if (unit == 'n' || unit == 'y') {
+    return -1;
+  }
+
+  return getDurationInUs(timestamp, unit, duration);
 }

-int32_t parseDuration(const char* token, int32_t tokenLen, int64_t* duration, char* unit) {
+int32_t parseNatualDuration(const char* token, int32_t tokenLen, int64_t* duration, char* unit) {
  errno = 0;

  /* get the basic numeric value */
@ -400,7 +399,121 @@ int32_t parseDuration(const char* token, int32_t tokenLen, int64_t* duration, ch
    return 0;
  }

-  return getTimestampInUsFromStrImpl(*duration, *unit, duration);
+  return getDurationInUs(*duration, *unit, duration);
+}
+
+int64_t taosTimeAdd(int64_t t, int64_t duration, char unit, int32_t precision) {
+  if (duration == 0) {
+    return t;
+  }
+  if (unit == 'y') {
+    duration *= 12;
+  } else if (unit != 'n') {
+    return t + duration;
+  }
+
+  struct tm tm;
+  time_t tt = (time_t)(t / TSDB_TICK_PER_SECOND(precision));
+  localtime_r(&tt, &tm);
+  int mon = tm.tm_year * 12 + tm.tm_mon + (int)duration;
+  tm.tm_year = mon / 12;
+  tm.tm_mon = mon % 12;
+
+  return (int64_t)(mktime(&tm) * TSDB_TICK_PER_SECOND(precision));
+}
+
+int32_t taosTimeCountInterval(int64_t skey, int64_t ekey, int64_t interval, char unit, int32_t precision) {
+  if (ekey < skey) {
+    int64_t tmp = ekey;
+    ekey = skey;
+    skey = tmp;
+  }
+  if (unit != 'n' && unit != 'y') {
+    return (int32_t)((ekey - skey) / interval);
+  }
+
+  skey /= (int64_t)(TSDB_TICK_PER_SECOND(precision));
+  ekey /= (int64_t)(TSDB_TICK_PER_SECOND(precision));
+
+  struct tm tm;
+  time_t t = (time_t)skey;
+  localtime_r(&t, &tm);
+  int smon = tm.tm_year * 12 + tm.tm_mon;
+
+  t = (time_t)ekey;
+  localtime_r(&t, &tm);
+  int emon = tm.tm_year * 12 + tm.tm_mon;
+
+  if (unit == 'y') {
+    interval *= 12;
+  }
+
+  return (emon - smon) / (int32_t)interval;
+}
+
+int64_t taosTimeTruncate(int64_t t, const SInterval* pInterval, int32_t precision) {
+  if (pInterval->sliding == 0) {
+    assert(pInterval->interval == 0);
+    return t;
+  }
+
+  int64_t start = t;
+  if (pInterval->slidingUnit == 'n' || pInterval->slidingUnit == 'y') {
+    start /= (int64_t)(TSDB_TICK_PER_SECOND(precision));
+    struct tm tm;
+    time_t tt = (time_t)start;
+    localtime_r(&tt, &tm);
+    tm.tm_sec = 0;
+    tm.tm_min = 0;
+    tm.tm_hour = 0;
+    tm.tm_mday = 1;
+
+    if (pInterval->slidingUnit == 'y') {
+      tm.tm_mon = 0;
+      tm.tm_year = (int)(tm.tm_year / pInterval->sliding * pInterval->sliding);
+    } else {
+      int mon = tm.tm_year * 12 + tm.tm_mon;
+      mon = (int)(mon / pInterval->sliding * pInterval->sliding);
+      tm.tm_year = mon / 12;
+      tm.tm_mon = mon % 12;
+    }
+
+    start = (int64_t)(mktime(&tm) * TSDB_TICK_PER_SECOND(precision));
+  } else {
+    int64_t delta = t - pInterval->interval;
+    int32_t factor = delta > 0 ? 1 : -1;
+
+    start = (delta / pInterval->sliding + factor) * pInterval->sliding;
+
+    if (pInterval->intervalUnit == 'd' || pInterval->intervalUnit == 'w') {
+      /*
+      * here we revised the start time of day according to the local time zone,
+      * but in case of DST, the start time of one day need to be dynamically decided.
+      */
+      // todo refactor to extract function that is available for Linux/Windows/Mac platform
+  #if defined(WINDOWS) && _MSC_VER >= 1900
+      // see https://docs.microsoft.com/en-us/cpp/c-runtime-library/daylight-dstbias-timezone-and-tzname?view=vs-2019
+      int64_t timezone = _timezone;
+      int32_t daylight = _daylight;
+      char**  tzname = _tzname;
+  #endif
+
+      start += (int64_t)(timezone * TSDB_TICK_PER_SECOND(precision));
+    }
+
+    int64_t end = start + pInterval->interval - 1;
+    if (end < t) {
+      start += pInterval->sliding;
+    }
+  }
+
+  if (pInterval->offset > 0) {
+    start = taosTimeAdd(start, pInterval->offset, pInterval->offsetUnit, precision);
+    if (start > t) {
+      start = taosTimeAdd(start, -pInterval->interval, pInterval->intervalUnit, precision);
+    }
+  }
+  return start;
 }

 // internal function, when program is paused in debugger,
@ -411,24 +524,38 @@ int32_t parseDuration(const char* token, int32_t tokenLen, int64_t* duration, ch
 //     2020-07-03 17:48:42
 // and the parameter can also be a variable.
 const char* fmtts(int64_t ts) {
-  static char buf[32];
+  static char buf[96];
+  size_t pos = 0;
+  struct tm tm;

-  time_t tt;
  if (ts > -62135625943 && ts < 32503651200) {
-    tt = ts;
-  } else if (ts > -62135625943000 && ts < 32503651200000) {
-    tt = ts / 1000;
-  } else {
-    tt = ts / 1000000;
+    time_t t = (time_t)ts;
+    localtime_r(&t, &tm);
+    pos += strftime(buf + pos, sizeof(buf), "s=%Y-%m-%d %H:%M:%S", &tm);
  }

-  struct tm* ptm = localtime(&tt);
-  size_t pos = strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", ptm);
+  if (ts > -62135625943000 && ts < 32503651200000) {
+    time_t t = (time_t)(ts / 1000);
+    localtime_r(&t, &tm);
+    if (pos > 0) {
+      buf[pos++] = ' ';
+      buf[pos++] = '|';
+      buf[pos++] = ' ';
+    }
+    pos += strftime(buf + pos, sizeof(buf), "ms=%Y-%m-%d %H:%M:%S", &tm);
+    pos += sprintf(buf + pos, ".%03d", (int)(ts % 1000));
+  }

-  if (ts <= -62135625943000 || ts >= 32503651200000) {
-    sprintf(buf + pos, ".%06d", (int)(ts % 1000000));
-  } else if (ts <= -62135625943 || ts >= 32503651200) {
-    sprintf(buf + pos, ".%03d", (int)(ts % 1000));
+  {
+    time_t t = (time_t)(ts / 1000000);
+    localtime_r(&t, &tm);
+    if (pos > 0) {
+      buf[pos++] = ' ';
+      buf[pos++] = '|';
+      buf[pos++] = ' ';
+    }
+    pos += strftime(buf + pos, sizeof(buf), "us=%Y-%m-%d %H:%M:%S", &tm);
+    pos += sprintf(buf + pos, ".%06d", (int)(ts % 1000000));
  }

  return buf;
--- a/src/plugins/http/src/httpContext.c
+++ b/src/plugins/http/src/httpContext.c
@ -131,8 +131,6 @@ HttpContext *httpCreateContext(int32_t fd) {
 HttpContext *httpGetContext(void *ptr) {
  uint64_t handleVal = (uint64_t)ptr;
  HttpContext **ppContext = taosCacheAcquireByKey(tsHttpServer.contextCache, &handleVal, sizeof(HttpContext *));
-  ASSERT(ppContext);
-  ASSERT(*ppContext);

  if (ppContext) {
    HttpContext *pContext = *ppContext;
--- a/src/plugins/http/src/httpRestJson.c
+++ b/src/plugins/http/src/httpRestJson.c
@ -87,15 +87,12 @@ bool restBuildSqlJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result,
  JsonBuf *jsonBuf = httpMallocJsonBuf(pContext);
  if (jsonBuf == NULL) return false;

-  cmd->numOfRows += numOfRows;
-
  int32_t     num_fields = taos_num_fields(result);
  TAOS_FIELD *fields = taos_fetch_fields(result);

  for (int32_t k = 0; k < numOfRows; ++k) {
    TAOS_ROW row = taos_fetch_row(result);
    if (row == NULL) {
-      cmd->numOfRows--;
      continue;
    }
    int32_t* length = taos_fetch_lengths(result);
@ -151,24 +148,23 @@ bool restBuildSqlJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result,
    }

    // data row array end
-    httpJsonToken(jsonBuf, JsonArrEnd);
-  }
+    httpJsonToken(jsonBuf, JsonArrEnd);   
+    cmd->numOfRows ++;

-  if (cmd->numOfRows >= tsRestRowLimit) {
-    httpDebug("context:%p, fd:%d, user:%s, retrieve rows:%d larger than limit:%d, abort retrieve", pContext,
-              pContext->fd, pContext->user, cmd->numOfRows, tsRestRowLimit);
-    return false;
-  } else {
    if (pContext->fd <= 0) {
-      httpError("context:%p, fd:%d, user:%s, connection is closed, abort retrieve", pContext, pContext->fd,
-                pContext->user);
+      httpError("context:%p, fd:%d, user:%s, conn closed, abort retrieve", pContext, pContext->fd, pContext->user);
+      return false;
+    }
+
+    if (cmd->numOfRows >= tsRestRowLimit) {
+      httpDebug("context:%p, fd:%d, user:%s, retrieve rows:%d larger than limit:%d, abort retrieve", pContext,
+                pContext->fd, pContext->user, cmd->numOfRows, tsRestRowLimit);
      return false;
-    } else {
-      httpDebug("context:%p, fd:%d, user:%s, total rows:%d retrieved", pContext, pContext->fd, pContext->user,
-                cmd->numOfRows);
-      return true;
    }
  }
+
+  httpDebug("context:%p, fd:%d, user:%s, retrieved row:%d", pContext, pContext->fd, pContext->user, cmd->numOfRows);
+  return true;
 }

 bool restBuildSqlTimestampJson(HttpContext *pContext, HttpSqlCmd *cmd, TAOS_RES *result, int32_t numOfRows) {
--- a/src/plugins/http/src/httpServer.c
+++ b/src/plugins/http/src/httpServer.c
@ -315,45 +315,48 @@ static bool httpReadData(HttpContext *pContext) {

  pContext->accessTimes++;
  pContext->lastAccessTime = taosGetTimestampSec();
+  char buf[HTTP_STEP_SIZE + 1] = {0};

-  char    buf[HTTP_STEP_SIZE + 1] = {0};
-  int32_t nread = (int32_t)taosReadSocket(pContext->fd, buf, HTTP_STEP_SIZE);
-  if (nread > 0) {
-    buf[nread] = '\0';
-    httpTraceL("context:%p, fd:%d, nread:%d content:%s", pContext, pContext->fd, nread, buf);
-    int32_t ok = httpParseBuf(pParser, buf, nread);
+  while (1) {
+    int32_t nread = (int32_t)taosReadSocket(pContext->fd, buf, HTTP_STEP_SIZE);
+    if (nread > 0) {
+      buf[nread] = '\0';
+      httpTraceL("context:%p, fd:%d, nread:%d content:%s", pContext, pContext->fd, nread, buf);
+      int32_t ok = httpParseBuf(pParser, buf, nread);

-    if (ok) {
-      httpError("context:%p, fd:%d, parse failed, ret:%d code:%d close connect", pContext, pContext->fd, ok, pParser->parseCode);
-      httpSendErrorResp(pContext, pParser->parseCode);
-      httpNotifyContextClose(pContext);
-      return false;
-    }
+      if (ok) {
+        httpError("context:%p, fd:%d, parse failed, ret:%d code:%d close connect", pContext, pContext->fd, ok,
+                  pParser->parseCode);
+        httpSendErrorResp(pContext, pParser->parseCode);
+        httpNotifyContextClose(pContext);
+        return false;
+      }

-    if (pParser->parseCode) {
-      httpError("context:%p, fd:%d, parse failed, code:%d close connect", pContext, pContext->fd, pParser->parseCode);
-      httpSendErrorResp(pContext, pParser->parseCode);
-      httpNotifyContextClose(pContext);
-      return false;
-    }
+      if (pParser->parseCode) {
+        httpError("context:%p, fd:%d, parse failed, code:%d close connect", pContext, pContext->fd, pParser->parseCode);
+        httpSendErrorResp(pContext, pParser->parseCode);
+        httpNotifyContextClose(pContext);
+        return false;
+      }

-    if (!pParser->parsed) {
-      httpTrace("context:%p, fd:%d, read not over yet, len:%d", pContext, pContext->fd, pParser->body.pos);
-      return false;
+      if (!pParser->parsed) {
+        httpTrace("context:%p, fd:%d, read not finished", pContext, pContext->fd);
+        continue;
+      } else {
+        httpDebug("context:%p, fd:%d, bodyLen:%d", pContext, pContext->fd, pParser->body.pos);
+        return true;
+      }
+    } else if (nread < 0) {
+      if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) {
+        httpDebug("context:%p, fd:%d, read from socket error:%d, wait another event", pContext, pContext->fd, errno);
+        return false;  // later again
+      } else {
+        httpError("context:%p, fd:%d, read from socket error:%d, close connect", pContext, pContext->fd, errno);
+        return false;
+      }
    } else {
-      httpDebug("context:%p, fd:%d, totalLen:%d", pContext, pContext->fd, pParser->body.pos);
-      return true;
-    }
-  } else if (nread < 0) {
-    if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) {
-      httpDebug("context:%p, fd:%d, read from socket error:%d, wait another event", pContext, pContext->fd, errno);
-      return false;  // later again
-    } else {
-      httpError("context:%p, fd:%d, read from socket error:%d, close connect", pContext, pContext->fd, errno);
+      httpError("context:%p, fd:%d, nread:%d, wait another event", pContext, pContext->fd, nread);
      return false;
    }
-  } else {
-    httpError("context:%p, fd:%d, nread:%d, wait another event", pContext, pContext->fd, nread);
-    return false;
  }
 }
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@ -132,12 +132,9 @@ typedef struct SQueryCostInfo {
 typedef struct SQuery {
  int16_t          numOfCols;
  int16_t          numOfTags;
-  char             intervalTimeUnit;
-  char             slidingTimeUnit;  // interval data type, used for daytime revise
  SOrderVal        order;
  STimeWindow      window;
-  int64_t          intervalTime;
-  int64_t          slidingTime;      // sliding time for sliding window query
+  SInterval        interval;
  int16_t          precision;
  int16_t          numOfOutput;
  int16_t          fillType;
--- a/src/query/inc/qFill.h
+++ b/src/query/inc/qFill.h
@ -51,12 +51,11 @@ typedef struct SFillInfo {
  int32_t rowSize;              // size of each row
 //  char ** pTags;                // tags value for current interpolation
  SFillTagColInfo* pTags;       // tags value for filling gap
-  int64_t slidingTime;          // sliding value to determine the number of result for a given time window
+  SInterval interval;
  char *  prevValues;           // previous row of data, to generate the interpolation results
  char *  nextValues;           // next row of data
  char**  pData;                // original result data block involved in filling data
  int32_t capacityInRows;       // data buffer size in rows
-  int8_t  slidingUnit;          // sliding time unit
  int8_t  precision;            // time resoluation
  SFillColInfo* pFillCol;       // column info for fill operations
 } SFillInfo;
--- a/src/query/inc/qSqlparser.h
+++ b/src/query/inc/qSqlparser.h
@ -65,6 +65,11 @@ typedef struct tVariantList {
  tVariantListItem *a;      /* One entry for each expression */
 } tVariantList;

+typedef struct SIntervalVal {
+  SStrToken interval;
+  SStrToken offset;
+} SIntervalVal;
+
 typedef struct SQuerySQL {
  struct tSQLExprList *pSelection;   // select clause
  tVariantList *       from;         // from clause
@ -72,6 +77,7 @@ typedef struct SQuerySQL {
  tVariantList *       pGroupby;     // groupby clause, only for tags[optional]
  tVariantList *       pSortOrder;   // orderby [optional]
  SStrToken            interval;     // interval [optional]
+  SStrToken            offset;       // offset window [optional]
  SStrToken            sliding;      // sliding window [optional]
  SLimitVal            limit;        // limit offset [optional]
  SLimitVal            slimit;       // group limit offset [optional]
@ -259,7 +265,7 @@ tSQLExprList *tSQLExprListAppend(tSQLExprList *pList, tSQLExpr *pNode, SStrToken
 void tSQLExprListDestroy(tSQLExprList *pList);

 SQuerySQL *tSetQuerySQLElems(SStrToken *pSelectToken, tSQLExprList *pSelection, tVariantList *pFrom, tSQLExpr *pWhere,
-                             tVariantList *pGroupby, tVariantList *pSortOrder, SStrToken *pInterval,
+                             tVariantList *pGroupby, tVariantList *pSortOrder, SIntervalVal *pInterval,
                             SStrToken *pSliding, tVariantList *pFill, SLimitVal *pLimit, SLimitVal *pGLimit);

 SCreateTableSQL *tSetCreateSQLElems(tFieldList *pCols, tFieldList *pTags, SStrToken *pMetricName,
--- a/src/query/inc/sql.y
+++ b/src/query/inc/sql.y
@ -458,9 +458,10 @@ tablelist(A) ::= tablelist(Y) COMMA ids(X) cpxName(Z) ids(F). {
 %type tmvar {SStrToken}
 tmvar(A) ::= VARIABLE(X).   {A = X;}

-%type interval_opt {SStrToken}
-interval_opt(N) ::= INTERVAL LP tmvar(E) RP.    {N = E;     }
-interval_opt(N) ::= .                           {N.n = 0; N.z = NULL; N.type = 0;   }
+%type interval_opt {SIntervalVal}
+interval_opt(N) ::= INTERVAL LP tmvar(E) RP.    {N.interval = E; N.offset.n = 0; N.offset.z = NULL; N.offset.type = 0;}
+interval_opt(N) ::= INTERVAL LP tmvar(E) COMMA tmvar(O) RP.    {N.interval = E; N.offset = O;}
+interval_opt(N) ::= .                           {memset(&N, 0, sizeof(N));}

 %type fill_opt {tVariantList*}
 %destructor fill_opt {tVariantListDestroy($$);}
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@ -131,21 +131,21 @@ static UNUSED_FUNC void* u_realloc(void* p, size_t __size) {
 static void setQueryStatus(SQuery *pQuery, int8_t status);
 static void finalizeQueryResult(SQueryRuntimeEnv *pRuntimeEnv);

-#define QUERY_IS_INTERVAL_QUERY(_q) ((_q)->intervalTime > 0)
+#define QUERY_IS_INTERVAL_QUERY(_q) ((_q)->interval.interval > 0)

 static void getNextTimeWindow(SQuery* pQuery, STimeWindow* tw) {
  int32_t factor = GET_FORWARD_DIRECTION_FACTOR(pQuery->order.order);
-  if (pQuery->intervalTimeUnit != 'n' && pQuery->intervalTimeUnit != 'y') {
-    tw->skey += pQuery->slidingTime * factor;
-    tw->ekey = tw->skey + pQuery->intervalTime - 1;
+  if (pQuery->interval.intervalUnit != 'n' && pQuery->interval.intervalUnit != 'y') {
+    tw->skey += pQuery->interval.sliding * factor;
+    tw->ekey = tw->skey + pQuery->interval.interval - 1;
    return;
  }

-  int64_t key = tw->skey / 1000, interval = pQuery->intervalTime;
+  int64_t key = tw->skey / 1000, interval = pQuery->interval.interval;
  if (pQuery->precision == TSDB_TIME_PRECISION_MICRO) {
    key /= 1000;
  }
-  if (pQuery->intervalTimeUnit == 'y') {
+  if (pQuery->interval.intervalUnit == 'y') {
    interval *= 12;
  }

@ -510,10 +510,10 @@ static STimeWindow getActiveTimeWindow(SWindowResInfo *pWindowResInfo, int64_t t

 if (pWindowResInfo->curIndex == -1) {  // the first window, from the previous stored value
    w.skey = pWindowResInfo->prevSKey;
-    if (pQuery->intervalTimeUnit == 'n' || pQuery->intervalTimeUnit == 'y') {
-      w.ekey = taosAddNatualInterval(w.skey, pQuery->intervalTime, pQuery->intervalTimeUnit, pQuery->precision) - 1;
+    if (pQuery->interval.intervalUnit == 'n' || pQuery->interval.intervalUnit == 'y') {
+      w.ekey = taosTimeAdd(w.skey, pQuery->interval.interval, pQuery->interval.intervalUnit, pQuery->precision);
    } else {
-      w.ekey = w.skey + pQuery->intervalTime - 1;
+      w.ekey = w.skey + pQuery->interval.interval - 1;
    }
  } else {
    int32_t slot = curTimeWindowIndex(pWindowResInfo);
@ -522,23 +522,23 @@ static STimeWindow getActiveTimeWindow(SWindowResInfo *pWindowResInfo, int64_t t
  }

  if (w.skey > ts || w.ekey < ts) {
-    if (pQuery->intervalTimeUnit == 'n' || pQuery->intervalTimeUnit == 'y') {
-      w.skey = taosGetIntervalStartTimestamp(ts, pQuery->slidingTime, pQuery->intervalTime, pQuery->intervalTimeUnit, pQuery->precision);
-      w.ekey = taosAddNatualInterval(w.skey, pQuery->intervalTime, pQuery->intervalTimeUnit, pQuery->precision) - 1;
+    if (pQuery->interval.intervalUnit == 'n' || pQuery->interval.intervalUnit == 'y') {
+      w.skey = taosTimeTruncate(ts, &pQuery->interval, pQuery->precision);
+      w.ekey = taosTimeAdd(w.skey, pQuery->interval.interval, pQuery->interval.intervalUnit, pQuery->precision) - 1;
    } else {
      int64_t st = w.skey;

      if (st > ts) {
-        st -= ((st - ts + pQuery->slidingTime - 1) / pQuery->slidingTime) * pQuery->slidingTime;
+        st -= ((st - ts + pQuery->interval.sliding - 1) / pQuery->interval.sliding) * pQuery->interval.sliding;
      }

-      int64_t et = st + pQuery->intervalTime - 1;
+      int64_t et = st + pQuery->interval.interval - 1;
      if (et < ts) {
-        st += ((ts - et + pQuery->slidingTime - 1) / pQuery->slidingTime) * pQuery->slidingTime;
+        st += ((ts - et + pQuery->interval.sliding - 1) / pQuery->interval.sliding) * pQuery->interval.sliding;
      }

      w.skey = st;
-      w.ekey = w.skey + pQuery->intervalTime - 1;
+      w.ekey = w.skey + pQuery->interval.interval - 1;
    }
  }

@ -550,8 +550,6 @@ static STimeWindow getActiveTimeWindow(SWindowResInfo *pWindowResInfo, int64_t t
    w.ekey = pQuery->window.ekey;
  }

-  assert(ts >= w.skey && ts <= w.ekey);
-
  return w;
 }

@ -856,7 +854,7 @@ static int32_t getNextQualifiedWindow(SQueryRuntimeEnv *pRuntimeEnv, STimeWindow

  int32_t startPos = 0;
  // tumbling time window query, a special case of sliding time window query
-  if (pQuery->slidingTime == pQuery->intervalTime && prevPosition != -1) {
+  if (pQuery->interval.sliding == pQuery->interval.interval && prevPosition != -1) {
    int32_t factor = GET_FORWARD_DIRECTION_FACTOR(pQuery->order.order);
    startPos = prevPosition + factor;
  } else {
@ -869,21 +867,21 @@ static int32_t getNextQualifiedWindow(SQueryRuntimeEnv *pRuntimeEnv, STimeWindow
   */
  if (QUERY_IS_ASC_QUERY(pQuery) && primaryKeys[startPos] > pNext->ekey) {
    TSKEY next = primaryKeys[startPos];
-    if (pQuery->intervalTimeUnit == 'n' || pQuery->intervalTimeUnit == 'y') {
-      pNext->skey = taosGetIntervalStartTimestamp(next, pQuery->slidingTime, pQuery->intervalTime, pQuery->intervalTimeUnit, pQuery->precision);
-      pNext->ekey = taosAddNatualInterval(pNext->skey, pQuery->intervalTime, pQuery->intervalTimeUnit, pQuery->precision) - 1;
+    if (pQuery->interval.intervalUnit == 'n' || pQuery->interval.intervalUnit == 'y') {
+      pNext->skey = taosTimeTruncate(next, &pQuery->interval, pQuery->precision);
+      pNext->ekey = taosTimeAdd(pNext->skey, pQuery->interval.interval, pQuery->interval.intervalUnit, pQuery->precision) - 1;
    } else {
-      pNext->ekey += ((next - pNext->ekey + pQuery->slidingTime - 1)/pQuery->slidingTime) * pQuery->slidingTime;
-      pNext->skey = pNext->ekey - pQuery->intervalTime + 1;
+      pNext->ekey += ((next - pNext->ekey + pQuery->interval.sliding - 1)/pQuery->interval.sliding) * pQuery->interval.sliding;
+      pNext->skey = pNext->ekey - pQuery->interval.interval + 1;
    }
  } else if ((!QUERY_IS_ASC_QUERY(pQuery)) && primaryKeys[startPos] < pNext->skey) {
    TSKEY next = primaryKeys[startPos];
-    if (pQuery->intervalTimeUnit == 'n' || pQuery->intervalTimeUnit == 'y') {
-      pNext->skey = taosGetIntervalStartTimestamp(next, pQuery->slidingTime, pQuery->intervalTime, pQuery->intervalTimeUnit, pQuery->precision);
-      pNext->ekey = taosAddNatualInterval(pNext->skey, pQuery->intervalTime, pQuery->intervalTimeUnit, pQuery->precision) - 1;
+    if (pQuery->interval.intervalUnit == 'n' || pQuery->interval.intervalUnit == 'y') {
+      pNext->skey = taosTimeTruncate(next, &pQuery->interval, pQuery->precision);
+      pNext->ekey = taosTimeAdd(pNext->skey, pQuery->interval.interval, pQuery->interval.intervalUnit, pQuery->precision) - 1;
    } else {
-      pNext->skey -= ((pNext->skey - next + pQuery->slidingTime - 1) / pQuery->slidingTime) * pQuery->slidingTime;
-      pNext->ekey = pNext->skey + pQuery->intervalTime - 1;
+      pNext->skey -= ((pNext->skey - next + pQuery->interval.sliding - 1) / pQuery->interval.sliding) * pQuery->interval.sliding;
+      pNext->ekey = pNext->skey + pQuery->interval.interval - 1;
    }
  }

@ -1879,20 +1877,20 @@ static bool onlyQueryTags(SQuery* pQuery) {
 /////////////////////////////////////////////////////////////////////////////////////////////

 void getAlignQueryTimeWindow(SQuery *pQuery, int64_t key, int64_t keyFirst, int64_t keyLast, STimeWindow *win) {
-  assert(key >= keyFirst && key <= keyLast && pQuery->slidingTime <= pQuery->intervalTime);
-  win->skey = taosGetIntervalStartTimestamp(key, pQuery->slidingTime, pQuery->intervalTime, pQuery->slidingTimeUnit, pQuery->precision);
+  assert(key >= keyFirst && key <= keyLast && pQuery->interval.sliding <= pQuery->interval.interval);
+  win->skey = taosTimeTruncate(key, &pQuery->interval, pQuery->precision);

  /*
-   * if the realSkey > INT64_MAX - pQuery->intervalTime, the query duration between
+   * if the realSkey > INT64_MAX - pQuery->interval.interval, the query duration between
   * realSkey and realEkey must be less than one interval.Therefore, no need to adjust the query ranges.
   */
-  if (keyFirst > (INT64_MAX - pQuery->intervalTime)) {
-    assert(keyLast - keyFirst < pQuery->intervalTime);
+  if (keyFirst > (INT64_MAX - pQuery->interval.interval)) {
+    assert(keyLast - keyFirst < pQuery->interval.interval);
    win->ekey = INT64_MAX;
-  } else if (pQuery->intervalTimeUnit == 'n' || pQuery->intervalTimeUnit == 'y') {
-    win->ekey = taosAddNatualInterval(win->skey, pQuery->intervalTime, pQuery->intervalTimeUnit, pQuery->precision) - 1;
+  } else if (pQuery->interval.intervalUnit == 'n' || pQuery->interval.intervalUnit == 'y') {
+    win->ekey = taosTimeAdd(win->skey, pQuery->interval.interval, pQuery->interval.intervalUnit, pQuery->precision) - 1;
  } else {
-    win->ekey = win->skey + pQuery->intervalTime - 1;
+    win->ekey = win->skey + pQuery->interval.interval - 1;
  }
 }

@ -2006,7 +2004,7 @@ static void changeExecuteScanOrder(SQInfo *pQInfo, SQueryTableMsg* pQueryMsg, bo
    return;
  }

-  if (isPointInterpoQuery(pQuery) && pQuery->intervalTime == 0) {
+  if (isPointInterpoQuery(pQuery) && pQuery->interval.interval == 0) {
    if (!QUERY_IS_ASC_QUERY(pQuery)) {
      qDebug(msg, GET_QINFO_ADDR(pQuery), "interp", pQuery->order.order, TSDB_ORDER_ASC, pQuery->window.skey,
             pQuery->window.ekey, pQuery->window.ekey, pQuery->window.skey);
@ -2017,7 +2015,7 @@ static void changeExecuteScanOrder(SQInfo *pQInfo, SQueryTableMsg* pQueryMsg, bo
    return;
  }

-  if (pQuery->intervalTime == 0) {
+  if (pQuery->interval.interval == 0) {
    if (onlyFirstQuery(pQuery)) {
      if (!QUERY_IS_ASC_QUERY(pQuery)) {
        qDebug(msg, GET_QINFO_ADDR(pQuery), "only-first", pQuery->order.order, TSDB_ORDER_ASC, pQuery->window.skey,
@ -4277,8 +4275,8 @@ static bool skipTimeInterval(SQueryRuntimeEnv *pRuntimeEnv, TSKEY* start) {
  }

  /*
-   * 1. for interval without interpolation query we forward pQuery->intervalTime at a time for
-   *    pQuery->limit.offset times. Since hole exists, pQuery->intervalTime*pQuery->limit.offset value is
+   * 1. for interval without interpolation query we forward pQuery->interval.interval at a time for
+   *    pQuery->limit.offset times. Since hole exists, pQuery->interval.interval*pQuery->limit.offset value is
   *    not valid. otherwise, we only forward pQuery->limit.offset number of points
   */
  assert(pRuntimeEnv->windowResInfo.prevSKey == TSKEY_INITIAL_VAL);
@ -4577,7 +4575,7 @@ int32_t doInitQInfo(SQInfo *pQInfo, STSBuf *pTsBuf, void *tsdb, int32_t vgId, bo
    getAlignQueryTimeWindow(pQuery, pQuery->window.skey, sk, ek, &w);

    pRuntimeEnv->pFillInfo = taosInitFillInfo(pQuery->order.order, w.skey, 0, (int32_t)pQuery->rec.capacity, pQuery->numOfOutput,
-                                              pQuery->slidingTime, pQuery->slidingTimeUnit, (int8_t)pQuery->precision,
+                                              pQuery->interval.sliding, pQuery->interval.slidingUnit, (int8_t)pQuery->precision,
                                              pQuery->fillType, pColInfo);
  }

@ -5438,7 +5436,7 @@ static void stableQueryImpl(SQInfo *pQInfo) {
      (isFixedOutputQuery(pRuntimeEnv) && (!isPointInterpoQuery(pQuery)) && (!pRuntimeEnv->groupbyNormalCol))) {
    multiTableQueryProcess(pQInfo);
  } else {
-    assert((pQuery->checkBuffer == 1 && pQuery->intervalTime == 0) || isPointInterpoQuery(pQuery) ||
+    assert((pQuery->checkBuffer == 1 && pQuery->interval.interval == 0) || isPointInterpoQuery(pQuery) ||
            isFirstLastRowQuery(pQuery) || pRuntimeEnv->groupbyNormalCol);

    sequentialTableProcess(pQInfo);
@ -5476,6 +5474,7 @@ static int32_t getColumnIndexInSource(SQueryTableMsg *pQueryMsg, SSqlFuncMsg *pE
    }
  }
  assert(0);
+  return -1;
 }

 bool validateExprColumnInfo(SQueryTableMsg *pQueryMsg, SSqlFuncMsg *pExprMsg, SColumnInfo* pTagCols) {
@ -5484,8 +5483,8 @@ bool validateExprColumnInfo(SQueryTableMsg *pQueryMsg, SSqlFuncMsg *pExprMsg, SC
 }

 static bool validateQueryMsg(SQueryTableMsg *pQueryMsg) {
-  if (pQueryMsg->intervalTime < 0) {
-    qError("qmsg:%p illegal value of interval time %" PRId64, pQueryMsg, pQueryMsg->intervalTime);
+  if (pQueryMsg->interval.interval < 0) {
+    qError("qmsg:%p illegal value of interval time %" PRId64, pQueryMsg, pQueryMsg->interval.interval);
    return false;
  }

@ -5564,8 +5563,12 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,

  pQueryMsg->window.skey = htobe64(pQueryMsg->window.skey);
  pQueryMsg->window.ekey = htobe64(pQueryMsg->window.ekey);
-  pQueryMsg->intervalTime = htobe64(pQueryMsg->intervalTime);
-  pQueryMsg->slidingTime = htobe64(pQueryMsg->slidingTime);
+  pQueryMsg->interval.interval = htobe64(pQueryMsg->interval.interval);
+  pQueryMsg->interval.sliding = htobe64(pQueryMsg->interval.sliding);
+  pQueryMsg->interval.offset = htobe64(pQueryMsg->interval.offset);
+  pQueryMsg->interval.intervalUnit = pQueryMsg->interval.intervalUnit;
+  pQueryMsg->interval.slidingUnit = pQueryMsg->interval.slidingUnit;
+  pQueryMsg->interval.offsetUnit = pQueryMsg->interval.offsetUnit;
  pQueryMsg->limit = htobe64(pQueryMsg->limit);
  pQueryMsg->offset = htobe64(pQueryMsg->offset);

@ -5778,7 +5781,7 @@ static int32_t convertQueryMsg(SQueryTableMsg *pQueryMsg, SArray **pTableIdList,
  qDebug("qmsg:%p query %d tables, type:%d, qrange:%" PRId64 "-%" PRId64 ", numOfGroupbyTagCols:%d, order:%d, "
         "outputCols:%d, numOfCols:%d, interval:%" PRId64 ", fillType:%d, comptsLen:%d, compNumOfBlocks:%d, limit:%" PRId64 ", offset:%" PRId64,
         pQueryMsg, pQueryMsg->numOfTables, pQueryMsg->queryType, pQueryMsg->window.skey, pQueryMsg->window.ekey, pQueryMsg->numOfGroupCols,
-         pQueryMsg->order, pQueryMsg->numOfOutput, pQueryMsg->numOfCols, pQueryMsg->intervalTime,
+         pQueryMsg->order, pQueryMsg->numOfOutput, pQueryMsg->numOfCols, pQueryMsg->interval.interval,
         pQueryMsg->fillType, pQueryMsg->tsLen, pQueryMsg->tsNumOfBlocks, pQueryMsg->limit, pQueryMsg->offset);

  return TSDB_CODE_SUCCESS;
@ -6117,10 +6120,7 @@ static SQInfo *createQInfoImpl(SQueryTableMsg *pQueryMsg, SSqlGroupbyExpr *pGrou
  pQuery->order.orderColId = pQueryMsg->orderColId;
  pQuery->pSelectExpr     = pExprs;
  pQuery->pGroupbyExpr    = pGroupbyExpr;
-  pQuery->intervalTime    = pQueryMsg->intervalTime;
-  pQuery->slidingTime     = pQueryMsg->slidingTime;
-  pQuery->intervalTimeUnit = pQueryMsg->intervalTimeUnit;
-  pQuery->slidingTimeUnit = pQueryMsg->slidingTimeUnit;
+  memcpy(&pQuery->interval, &pQueryMsg->interval, sizeof(pQuery->interval));
  pQuery->fillType        = pQueryMsg->fillType;
  pQuery->numOfTags       = pQueryMsg->numOfTags;
  pQuery->tagColList      = pTagCols;
--- a/src/query/src/qFill.c
+++ b/src/query/src/qFill.c
@ -38,8 +38,8 @@ SFillInfo* taosInitFillInfo(int32_t order, TSKEY skey, int32_t numOfTags, int32_
  pFillInfo->numOfTags = numOfTags;
  pFillInfo->numOfCols = numOfCols;
  pFillInfo->precision = precision;
-  pFillInfo->slidingTime = slidingTime;
-  pFillInfo->slidingUnit = slidingUnit;
+  pFillInfo->interval.sliding = slidingTime;
+  pFillInfo->interval.slidingUnit = slidingUnit;

  pFillInfo->pData = malloc(POINTER_BYTES * numOfCols);
  if (numOfTags > 0) {
@ -108,21 +108,15 @@ void* taosDestoryFillInfo(SFillInfo* pFillInfo) {
  return NULL;
 }

-static TSKEY taosGetRevisedEndKey(TSKEY ekey, int32_t order, int64_t timeInterval, int8_t slidingTimeUnit, int8_t precision) {
-  if (order == TSDB_ORDER_ASC) {
-    return ekey;
-  } else {
-    return taosGetIntervalStartTimestamp(ekey, timeInterval, timeInterval, slidingTimeUnit, precision);
-  }
-}
-
 void taosFillSetStartInfo(SFillInfo* pFillInfo, int32_t numOfRows, TSKEY endKey) {
  if (pFillInfo->fillType == TSDB_FILL_NONE) {
    return;
  }

-  pFillInfo->endKey = taosGetRevisedEndKey(endKey, pFillInfo->order, pFillInfo->slidingTime, pFillInfo->slidingUnit,
-      pFillInfo->precision);
+  pFillInfo->endKey = endKey;
+  if (pFillInfo->order != TSDB_ORDER_ASC) {
+    pFillInfo->endKey = taosTimeTruncate(endKey, &pFillInfo->interval, pFillInfo->precision);
+  }

  pFillInfo->rowIdx    = 0;
  pFillInfo->numOfRows = numOfRows;
@ -172,30 +166,34 @@ int64_t getFilledNumOfRes(SFillInfo* pFillInfo, TSKEY ekey, int32_t maxNumOfRows

  int32_t numOfRows = taosNumOfRemainRows(pFillInfo);

-  TSKEY ekey1 = taosGetRevisedEndKey(ekey, pFillInfo->order, pFillInfo->slidingTime, pFillInfo->slidingUnit,
-      pFillInfo->precision);
+  TSKEY ekey1 = ekey;
+  if (pFillInfo->order != TSDB_ORDER_ASC) {
+    pFillInfo->endKey = taosTimeTruncate(ekey, &pFillInfo->interval, pFillInfo->precision);
+  }

  int64_t numOfRes = -1;
  if (numOfRows > 0) {  // still fill gap within current data block, not generating data after the result set.
    TSKEY lastKey = tsList[pFillInfo->numOfRows - 1];
-
-    if (pFillInfo->slidingUnit != 'y' && pFillInfo->slidingUnit != 'n') {
-      numOfRes = (int64_t)(ABS(lastKey - pFillInfo->start) / pFillInfo->slidingTime) + 1;
-    } else {
-      numOfRes = taosCountNatualInterval(lastKey, pFillInfo->start, pFillInfo->slidingTime, pFillInfo->slidingUnit, pFillInfo->precision) + 1;
-    }
+    numOfRes = taosTimeCountInterval(
+      lastKey,
+      pFillInfo->start,
+      pFillInfo->interval.sliding,
+      pFillInfo->interval.slidingUnit,
+      pFillInfo->precision);
+    numOfRes += 1;
    assert(numOfRes >= numOfRows);
  } else { // reach the end of data
    if ((ekey1 < pFillInfo->start && FILL_IS_ASC_FILL(pFillInfo)) ||
        (ekey1 > pFillInfo->start && !FILL_IS_ASC_FILL(pFillInfo))) {
      return 0;
    }
-    // the numOfRes rows are all filled with specified policy
-    if (pFillInfo->slidingUnit != 'y' && pFillInfo->slidingUnit != 'n') {
-      numOfRes = (ABS(ekey1 - pFillInfo->start) / pFillInfo->slidingTime) + 1;
-    } else {
-      numOfRes = taosCountNatualInterval(ekey1, pFillInfo->start, pFillInfo->slidingTime, pFillInfo->slidingUnit, pFillInfo->precision) + 1;
-    }
+    numOfRes = taosTimeCountInterval(
+      ekey1,
+      pFillInfo->start,
+      pFillInfo->interval.sliding,
+      pFillInfo->interval.slidingUnit,
+      pFillInfo->precision);
+    numOfRes += 1;
  }

  return (numOfRes > maxNumOfRows) ? maxNumOfRows : numOfRes;
@ -374,12 +372,7 @@ static void doFillResultImpl(SFillInfo* pFillInfo, tFilePage** data, int32_t* nu
    setTagsValue(pFillInfo, data, *num);
  }

-// TODO natual sliding time
-  if (pFillInfo->slidingUnit != 'n' && pFillInfo->slidingUnit != 'y') {
-    pFillInfo->start += (pFillInfo->slidingTime * step);
-  } else {
-    pFillInfo->start = taosAddNatualInterval(pFillInfo->start, pFillInfo->slidingTime*step, pFillInfo->slidingUnit, pFillInfo->precision);
-  }
+  pFillInfo->start = taosTimeAdd(pFillInfo->start, pFillInfo->interval.sliding * step, pFillInfo->interval.slidingUnit, pFillInfo->precision);
  pFillInfo->numOfCurrent++;

  (*num) += 1;
@ -486,12 +479,7 @@ int32_t generateDataBlockImpl(SFillInfo* pFillInfo, tFilePage** data, int32_t nu
        // set the tag value for final result
        setTagsValue(pFillInfo, data, num);

-        // TODO natual sliding time
-        if (pFillInfo->slidingUnit != 'n' && pFillInfo->slidingUnit != 'y') {
-          pFillInfo->start += (pFillInfo->slidingTime * step);
-        } else {
-          pFillInfo->start = taosAddNatualInterval(pFillInfo->start, pFillInfo->slidingTime*step, pFillInfo->slidingUnit, pFillInfo->precision);
-        }
+        pFillInfo->start = taosTimeAdd(pFillInfo->start, pFillInfo->interval.sliding*step, pFillInfo->interval.slidingUnit, pFillInfo->precision);
        pFillInfo->rowIdx += 1;

        pFillInfo->numOfCurrent +=1;
--- a/src/query/src/qParserImpl.c
+++ b/src/query/src/qParserImpl.c
@ -135,7 +135,7 @@ tSQLExpr *tSQLExprIdValueCreate(SStrToken *pToken, int32_t optrType) {
    pSQLExpr->val.nType = TSDB_DATA_TYPE_BIGINT;
    pSQLExpr->nSQLOptr = TK_TIMESTAMP;  // TK_TIMESTAMP used to denote the time value is in microsecond
  } else if (optrType == TK_VARIABLE) {
-    int32_t ret = getTimestampInUsFromStr(pToken->z, pToken->n, &pSQLExpr->val.i64Key);
+    int32_t ret = parseAbsoluteDuration(pToken->z, pToken->n, &pSQLExpr->val.i64Key);
    UNUSED(ret);

    pSQLExpr->val.nType = TSDB_DATA_TYPE_BIGINT;
@ -443,44 +443,6 @@ void setDBName(SStrToken *pCpxName, SStrToken *pDB) {
  pCpxName->n = pDB->n;
 }

-int32_t getTimestampInUsFromStrImpl(int64_t val, char unit, int64_t *result) {
-  *result = val;
-
-  switch (unit) {
-    case 's':
-      (*result) *= MILLISECOND_PER_SECOND;
-      break;
-    case 'm':
-      (*result) *= MILLISECOND_PER_MINUTE;
-      break;
-    case 'h':
-      (*result) *= MILLISECOND_PER_HOUR;
-      break;
-    case 'd':
-      (*result) *= MILLISECOND_PER_DAY;
-      break;
-    case 'w':
-      (*result) *= MILLISECOND_PER_WEEK;
-      break;
-    case 'n':
-      (*result) *= MILLISECOND_PER_MONTH;
-      break;
-    case 'y':
-      (*result) *= MILLISECOND_PER_YEAR;
-      break;
-    case 'a':
-      break;
-    default: {
-      ;
-      return -1;
-    }
-  }
-
-  /* get the value in microsecond */
-  (*result) *= 1000L;
-  return 0;
-}
-
 void tSQLSetColumnInfo(TAOS_FIELD *pField, SStrToken *pName, TAOS_FIELD *pType) {
  int32_t maxLen = sizeof(pField->name) / sizeof(pField->name[0]);
  
@ -535,7 +497,7 @@ void tSQLSetColumnType(TAOS_FIELD *pField, SStrToken *type) {
 * extract the select info out of sql string
 */
 SQuerySQL *tSetQuerySQLElems(SStrToken *pSelectToken, tSQLExprList *pSelection, tVariantList *pFrom, tSQLExpr *pWhere,
-                             tVariantList *pGroupby, tVariantList *pSortOrder, SStrToken *pInterval,
+                             tVariantList *pGroupby, tVariantList *pSortOrder, SIntervalVal *pInterval,
                             SStrToken *pSliding, tVariantList *pFill, SLimitVal *pLimit, SLimitVal *pGLimit) {
  assert(pSelection != NULL);

@ -558,7 +520,8 @@ SQuerySQL *tSetQuerySQLElems(SStrToken *pSelectToken, tSQLExprList *pSelection,
  }

  if (pInterval != NULL) {
-    pQuery->interval = *pInterval;
+    pQuery->interval = pInterval->interval;
+    pQuery->offset = pInterval->offset;
  }

  if (pSliding != NULL) {
--- a/src/query/src/qUtil.c
+++ b/src/query/src/qUtil.c
@ -54,7 +54,7 @@ int32_t initWindowResInfo(SWindowResInfo *pWindowResInfo, SQueryRuntimeEnv *pRun
    return TSDB_CODE_QRY_OUT_OF_MEMORY;
  }

-  pWindowResInfo->interval = pRuntimeEnv->pQuery->intervalTime;
+  pWindowResInfo->interval = pRuntimeEnv->pQuery->interval.interval;

  pSummary->internalSupSize += sizeof(SWindowResult) * threshold;
  pSummary->internalSupSize += (pRuntimeEnv->pQuery->numOfOutput * sizeof(SResultInfo) + pRuntimeEnv->interBufSize) * pWindowResInfo->capacity;
--- a/src/query/src/sql.c
+++ b/src/query/src/sql.c
--- a/src/util/src/tarray.c
+++ b/src/util/src/tarray.c
--- a/src/util/src/tlog.c
+++ b/src/util/src/tlog.c
@ -433,7 +433,7 @@ void taosPrintLongString(const char *flags, int32_t dflag, const char *format, .

  va_list        argpointer;
  char           buffer[MAX_LOGLINE_DUMP_BUFFER_SIZE];
-  int32_t            len;
+  int32_t        len;
  struct tm      Tm, *ptm;
  struct timeval timeSecs;
  time_t         curTime;
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@ -186,6 +186,7 @@ python3 ./test.py -f functions/function_sum.py
 python3 ./test.py -f functions/function_top.py
 #python3 ./test.py -f functions/function_twa.py
 python3 queryCount.py
+python3 ./test.py -f query/queryGroupbyWithInterval.py

 # tools
 python3 test.py -f tools/taosdemo.py
--- a/tests/pytest/query/intervalOffset.py
+++ b/tests/pytest/query/intervalOffset.py
@ -0,0 +1,225 @@
+###################################################################
+#           Copyright (c) 2020 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+import taos
+from util.log import *
+from util.cases import *
+from util.sql import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+
+    def general(self):
+        tdSql.execute("create table meters(ts timestamp, s int) tags(id int)")
+        tdSql.execute("create table t0 using meters tags(0)")
+        tdSql.execute("create table t1 using meters tags(1)")
+        tdSql.execute("create table t2 using meters tags(2)")
+        tdSql.execute("create table t3 using meters tags(3)")
+        tdSql.execute("create table t4 using meters tags(4)")
+
+        tdSql.execute("insert into t0 values('2019-01-01 00:00:00', 1)")
+        tdSql.execute("insert into t1 values('2019-01-01 00:00:01', 1)")
+        tdSql.execute("insert into t2 values('2019-01-01 00:01:00', 1)")
+        tdSql.execute("insert into t1 values('2019-01-01 00:01:01', 1)")
+        tdSql.execute("insert into t1 values('2019-01-01 00:01:02', 1)")
+        tdSql.execute("insert into t1 values('2019-01-01 00:01:03', 1)")
+        tdSql.execute("insert into t1 values('2019-01-01 00:01:30', 1)")
+        tdSql.execute("insert into t1 values('2019-01-01 00:01:50', 1)")
+        tdSql.execute("insert into t2 values('2019-01-01 00:02:00', 1)")
+        tdSql.execute("insert into t3 values('2019-01-01 00:02:02', 1)")
+        tdSql.execute("insert into t3 values('2019-01-01 00:02:59', 1)")
+        tdSql.execute("insert into t4 values('2019-01-01 00:02:59', 1)")
+        tdSql.execute("insert into t1 values('2019-01-01 00:03:10', 1)")
+        tdSql.execute("insert into t2 values('2019-01-01 00:08:00', 1)")
+        tdSql.execute("insert into t1 values('2019-01-01 00:08:00', 1)")
+
+        tdSql.query("select count(*) from meters interval(1m, 1s)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 2)
+        tdSql.checkData(2, 1, 6)
+        tdSql.checkData(3, 1, 3)
+        tdSql.checkData(4, 1, 1)
+        tdSql.checkData(5, 1, 2)
+
+        tdSql.query("select count(*) from meters interval(1m, 2s)")
+        tdSql.checkData(0, 1, 2)
+        tdSql.checkData(1, 1, 2)
+        tdSql.checkData(2, 1, 5)
+        tdSql.checkData(3, 1, 3)
+        tdSql.checkData(4, 1, 1)
+        tdSql.checkData(5, 1, 2)
+
+        tdSql.query("select count(*) from meters interval(90s, 1500a)")
+        tdSql.checkData(0, 1, 2)
+        tdSql.checkData(1, 1, 5)
+        tdSql.checkData(2, 1, 5)
+        tdSql.checkData(3, 1, 1)
+        tdSql.checkData(4, 1, 2)
+
+    def singleTable(self):
+        tdSql.execute("create table car(ts timestamp, s int)")
+        tdSql.execute("insert into car values('2019-01-01 00:00:00', 1)")
+        tdSql.execute("insert into car values('2019-05-13 12:00:00', 1)")
+        tdSql.execute("insert into car values('2019-12-31 23:59:59', 1)")
+        tdSql.execute("insert into car values('2020-01-01 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-01-02 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-01-03 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-01-04 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-01-05 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-01-31 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-02-01 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-02-02 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-02-29 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-03-01 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-03-02 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-03-15 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-03-31 12:00:00', 1)")
+        tdSql.execute("insert into car values('2020-05-01 12:00:00', 1)")
+
+        tdSql.query("select count(*) from car interval(1n, 10d)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 1)
+        tdSql.checkData(2, 1, 6)
+        tdSql.checkData(3, 1, 3)
+        tdSql.checkData(4, 1, 3)
+        tdSql.checkData(5, 1, 2)
+        tdSql.checkData(6, 1, 1)
+
+        tdSql.query("select count(*) from car interval(1n, 10d) order by ts desc")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 2)
+        tdSql.checkData(2, 1, 3)
+        tdSql.checkData(3, 1, 3)
+        tdSql.checkData(4, 1, 6)
+        tdSql.checkData(5, 1, 1)
+        tdSql.checkData(6, 1, 1)
+
+        tdSql.query("select count(*) from car interval(2n, 5d)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 1)
+        tdSql.checkData(2, 1, 6)
+        tdSql.checkData(3, 1, 6)
+        tdSql.checkData(4, 1, 3)
+
+        tdSql.query("select count(*) from car interval(2n) order by ts desc")
+        tdSql.checkData(0, 1, 3)
+        tdSql.checkData(1, 1, 6)
+        tdSql.checkData(2, 1, 6)
+        tdSql.checkData(3, 1, 1)
+        tdSql.checkData(4, 1, 1)
+
+        tdSql.query("select count(*) from car interval(1y, 1n)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 8)
+        tdSql.checkData(2, 1, 8)
+
+        tdSql.query("select count(*) from car interval(1y, 2n)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 11)
+        tdSql.checkData(2, 1, 5)
+
+        tdSql.query("select count(*) from car where ts > '2019-05-14 00:00:00' interval(1y, 5d)")
+        tdSql.checkData(0, 1, 6)
+        tdSql.checkData(1, 1, 9)
+
+    def superTable(self):
+        tdSql.execute("create table cars(ts timestamp, s int) tags(id int)")
+        tdSql.execute("create table car0 using cars tags(0)")
+        tdSql.execute("create table car1 using cars tags(1)")
+        tdSql.execute("create table car2 using cars tags(2)")
+        tdSql.execute("create table car3 using cars tags(3)")
+        tdSql.execute("create table car4 using cars tags(4)")
+
+        tdSql.execute("insert into car0 values('2019-01-01 00:00:00', 1)")
+        tdSql.execute("insert into car1 values('2019-05-13 12:00:00', 1)")
+        tdSql.execute("insert into car2 values('2019-12-31 23:59:59', 1)")
+        tdSql.execute("insert into car1 values('2020-01-01 12:00:00', 1)")
+        tdSql.execute("insert into car1 values('2020-01-02 12:00:00', 1)")
+        tdSql.execute("insert into car1 values('2020-01-03 12:00:00', 1)")
+        tdSql.execute("insert into car1 values('2020-01-04 12:00:00', 1)")
+        tdSql.execute("insert into car1 values('2020-01-05 12:00:00', 1)")
+        tdSql.execute("insert into car1 values('2020-01-31 12:00:00', 1)")
+        tdSql.execute("insert into car1 values('2020-02-01 12:00:00', 1)")
+        tdSql.execute("insert into car2 values('2020-02-02 12:00:00', 1)")
+        tdSql.execute("insert into car2 values('2020-02-29 12:00:00', 1)")
+        tdSql.execute("insert into car3 values('2020-03-01 12:00:00', 1)")
+        tdSql.execute("insert into car3 values('2020-03-02 12:00:00', 1)")
+        tdSql.execute("insert into car3 values('2020-03-15 12:00:00', 1)")
+        tdSql.execute("insert into car4 values('2020-03-31 12:00:00', 1)")
+        tdSql.execute("insert into car3 values('2020-05-01 12:00:00', 1)")
+
+        tdSql.query("select count(*) from cars interval(1n, 10d)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 1)
+        tdSql.checkData(2, 1, 6)
+        tdSql.checkData(3, 1, 3)
+        tdSql.checkData(4, 1, 3)
+        tdSql.checkData(5, 1, 2)
+        tdSql.checkData(6, 1, 1)
+
+        tdSql.query("select count(*) from cars interval(1n, 10d) order by ts desc")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 2)
+        tdSql.checkData(2, 1, 3)
+        tdSql.checkData(3, 1, 3)
+        tdSql.checkData(4, 1, 6)
+        tdSql.checkData(5, 1, 1)
+        tdSql.checkData(6, 1, 1)
+
+        tdSql.query("select count(*) from cars interval(2n, 5d)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 1)
+        tdSql.checkData(2, 1, 6)
+        tdSql.checkData(3, 1, 6)
+        tdSql.checkData(4, 1, 3)
+
+        tdSql.query("select count(*) from cars interval(2n) order by ts desc")
+        tdSql.checkData(0, 1, 3)
+        tdSql.checkData(1, 1, 6)
+        tdSql.checkData(2, 1, 6)
+        tdSql.checkData(3, 1, 1)
+        tdSql.checkData(4, 1, 1)
+
+        tdSql.query("select count(*) from cars interval(1y, 1n)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 8)
+        tdSql.checkData(2, 1, 8)
+
+        tdSql.query("select count(*) from cars interval(1y, 2n)")
+        tdSql.checkData(0, 1, 1)
+        tdSql.checkData(1, 1, 11)
+        tdSql.checkData(2, 1, 5)
+
+        tdSql.query("select count(*) from cars where ts > '2019-05-14 00:00:00' interval(1y, 5d)")
+        tdSql.checkData(0, 1, 6)
+        tdSql.checkData(1, 1, 9)
+
+    def run(self):
+        tdSql.prepare()
+        self.general()
+        self.singleTable()
+        self.superTable()
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
+
--- a/tests/pytest/query/natualInterval.py
+++ b/tests/pytest/query/natualInterval.py
@ -89,10 +89,10 @@ class TDTestCase:
    def superTable(self):
        tdSql.execute("create table cars(ts timestamp, s int) tags(id int)")
        tdSql.execute("create table car0 using cars tags(0)")
-        tdSql.execute("create table car1 using cars tags(0)")
-        tdSql.execute("create table car2 using cars tags(0)")
-        tdSql.execute("create table car3 using cars tags(0)")
-        tdSql.execute("create table car4 using cars tags(0)")
+        tdSql.execute("create table car1 using cars tags(1)")
+        tdSql.execute("create table car2 using cars tags(2)")
+        tdSql.execute("create table car3 using cars tags(3)")
+        tdSql.execute("create table car4 using cars tags(4)")

        tdSql.execute("insert into car0 values('2019-01-01 00:00:00', 1)")
        tdSql.execute("insert into car1 values('2019-05-13 12:00:00', 1)")
--- a/tests/pytest/query/queryGroupbyWithInterval.py
+++ b/tests/pytest/query/queryGroupbyWithInterval.py
@ -0,0 +1,53 @@
+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+import taos
+from util.log import tdLog
+from util.cases import tdCases
+from util.sql import tdSql
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+        
+        tdSql.execute(
+            "create table stest(ts timestamp,size INT,filenum INT) tags (appname binary(500),tenant binary(500))")
+        tdSql.execute(
+            "insert into test1 using stest tags('test1','aaa') values ('2020-09-04 16:53:54.003',210,3)")
+        tdSql.execute(
+            "insert into test2 using stest tags('test1','aaa') values ('2020-09-04 16:53:56.003',210,3)")
+        tdSql.execute(
+            "insert into test11 using stest tags('test11','bbb') values ('2020-09-04 16:53:57.003',210,3)")
+        tdSql.execute(
+            "insert into test12 using stest tags('test11','bbb') values ('2020-09-04 16:53:58.003',210,3)")
+        tdSql.execute(
+            "insert into test21 using stest tags('test21','ccc') values ('2020-09-04 16:53:59.003',210,3)")
+        tdSql.execute(
+            "insert into test22 using stest tags('test21','ccc') values ('2020-09-04 16:54:54.003',210,3)")
+
+        tdSql.query("select sum(size) from stest interval(1d) group by appname")        
+        tdSql.checkRows(3)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
--- a/tests/script/general/db/delete_reusevnode.sim
+++ b/tests/script/general/db/delete_reusevnode.sim
@ -1,5 +1,6 @@
 system sh/stop_dnodes.sh

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
 system sh/deploy.sh -n dnode1 -i 1

 print ========= start dnodes
--- a/tests/script/general/db/delete_reusevnode2.sim
+++ b/tests/script/general/db/delete_reusevnode2.sim
@ -1,5 +1,6 @@
 system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4

 print ========= start dnodes
 system sh/exec.sh -n dnode1 -s start
--- a/tests/script/general/db/dropdnodes.sim
+++ b/tests/script/general/db/dropdnodes.sim
@ -4,6 +4,8 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel            -v 2
 system sh/deploy.sh -n dnode2 -i 2
 system sh/cfg.sh -n dnode1 -c walLevel            -v 2
+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4

 print ==========  prepare data
 system sh/exec.sh -n dnode1 -s start
--- a/tests/script/general/parser/auto_create_tb_drop_tb.sim
+++ b/tests/script/general/parser/auto_create_tb_drop_tb.sim
@ -1,7 +1,7 @@
 system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 1
-system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 1
+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
 system sh/cfg.sh -n dnode1 -c ctime -v 30
 system sh/exec.sh -n dnode1 -s start
 sleep 3000
--- a/tests/script/general/parser/dbtbnameValidate.sim
+++ b/tests/script/general/parser/dbtbnameValidate.sim
@ -86,8 +86,6 @@ print ========== insert data by multi-format
 sql create table abc.tk_mt (ts timestamp, a int, b binary(16), c bool, d float, e double, f nchar(16)) tags (t1 int, t2 binary(16))

 sql create table abc.tk_subt001 using tk_mt tags(1, 'subt001')
-sql insert into abc.tk_subt001                  values (now-1y, 1, 'binary_1', true,  1.001, 2.001, 'nchar_1')
-sql insert into abc.tk_subt001                  values (now-1n, 2, 'binary_2', true,  1.002, 2.002, 'nchar_2') 
 sql insert into abc.tk_subt001                  values (now-1w, 3, 'binary_3', true,  1.003, 2.003, 'nchar_3')
 sql insert into abc.tk_subt001 (ts, a, c, e, f) values (now-1d, 4,             false,        2.004, 'nchar_4')
 sql insert into abc.tk_subt001 (ts, a, c, e, f) values (now-1h, 5,             false,        2.005, 'nchar_5')
@ -95,35 +93,29 @@ sql insert into abc.tk_subt001 (ts, b, d)       values (now-1m,    'binary_6',
 sql insert into abc.tk_subt001 (ts, b, d)       values (now-1s,    'binary_7',        1.007)
 sql insert into abc.tk_subt001 (ts, b, d)       values (now-1a,    'binary_8',        1.008)
 sql select * from tk_subt001
-if $rows != 8 then 
-  print ==== expect rows is 8, but actually is $rows
+if $rows != 6 then 
+  print ==== expect rows is 6, but actually is $rows
  return -1
 endi

-sql insert into abc.tk_subt002 using tk_mt tags (22,'subt002x')  values (now-2y, 2008, 'binary_2008', false, 2008.001, 2008.001, 'nchar_2008')
-sql insert into abc.tk_subt002 using tk_mt tags (2, 'subt002')   values (now-1y, 2007, 'binary_2007', false, 2007.001, 2007.001, 'nchar_2007')
-sql insert into abc.tk_subt002 using tk_mt tags (2, 'subt002')   values (now-1n, 2006, 'binary_2006', true,  2006.001, 2006.001, 'nchar_2006')
-sql insert into abc.tk_subt002 using tk_mt tags (2, 'subt002')   values (now+1s, 2001, 'binary_2001', true,  2001.001, 2001.001, 'nchar_2001')
+sql insert into abc.tk_subt002 using tk_mt tags (22, 'subt002x')   values (now+1s, 2001, 'binary_2001', true,  2001.001, 2001.001, 'nchar_2001')
 sql insert into abc.tk_subt002 using tk_mt tags (2, 'subt002')   values (now+1m, 2002, 'binary_2002', false, 2002.001, 2002.001, 'nchar_2002')  
 sql insert into abc.tk_subt002 using tk_mt tags (2, 'subt002')   values (now+1h, 2003, 'binary_2003', false, 2003.001, 2003.001, 'nchar_2003')
 sql insert into abc.tk_subt002 using tk_mt tags (2, 'subt002')   values (now+1d, 2004, 'binary_2004', true,  2004.001, 2004.001, 'nchar_2004')
 sql insert into abc.tk_subt002 using tk_mt tags (2, 'subt002')   values (now+1w, 2005, 'binary_2005', false, 2005.001, 2005.001, 'nchar_2005')
 sql select * from tk_subt002
-if $rows != 8 then 
-  print ==== expect rows is 8, but actually is $rows
+if $rows != 5 then 
+  print ==== expect rows is 5, but actually is $rows
  return -1
 endi

-sql insert into abc.tk_subt003 (ts, a, c, e, f) using tk_mt tags (3, 'subt003')    values (now-5y,  3001,                false, 3001.001,           'nchar_3001')
-sql insert into abc.tk_subt003 (ts, a, c, e, f) using tk_mt tags (3, 'subt003')    values (now-4y,  3002,                false, 3002.001,           'nchar_3002')
-sql insert into abc.tk_subt003 (ts, a, c, e, f) using tk_mt tags (3, 'subt003')    values (now-3y,  3003,                true , 3003.001,           'nchar_3003')
-sql insert into abc.tk_subt003 (ts, a, c, e, f) using tk_mt tags (3, 'subt003')    values (now-2y,  3004,                false, 3004.001,           'nchar_3004')
-sql insert into abc.tk_subt003                                                     values (now-37d, 3005, 'binary_3005', false, 3005.001, 3005.001, 'nchar_3005')
+sql insert into abc.tk_subt003 (ts, a, c, e, f) using tk_mt tags (3, 'subt003')    values (now-38d, 3004,                false, 3004.001,           'nchar_3004')
+sql insert into abc.tk_subt003 (ts, a, c, e, f) using tk_mt tags (3, 'subt003')    values (now-37d, 3005,                false, 3005.001,           'nchar_3005')
 sql insert into abc.tk_subt003                                                     values (now-36d, 3006, 'binary_3006', true,  3006.001, 3006.001, 'nchar_3006')
 sql insert into abc.tk_subt003 (ts, a, c, e, f) using tk_mt tags (33, 'subt003x')  values (now-35d, 3007,                false, 3007.001,           'nchar_3007')
 sql select * from tk_subt003
-if $rows != 7 then 
-  print ==== expect rows is 7, but actually is $rows
+if $rows != 4 then 
+  print ==== expect rows is 4, but actually is $rows
  return -1
 endi

--- a/tests/script/general/stable/disk.sim
+++ b/tests/script/general/stable/disk.sim
@ -4,6 +4,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 4
+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
 system sh/exec.sh -n dnode1 -s start

 sleep 3000
--- a/tests/script/general/stable/vnode3.sim
+++ b/tests/script/general/stable/vnode3.sim
@ -3,6 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 4
+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
 system sh/exec.sh -n dnode1 -s start

 sleep 3000
--- a/tests/script/general/table/vgroup.sim
+++ b/tests/script/general/table/vgroup.sim
@ -2,6 +2,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxVgroupsPerDb -v 4
+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
 system sh/exec.sh -n dnode1 -s start

 sleep 3000
--- a/tests/script/unique/cluster/balance1.sim
+++ b/tests/script/unique/cluster/balance1.sim
@ -35,6 +35,16 @@ system sh/cfg.sh -n dnode6 -c wallevel -v 1
 system sh/cfg.sh -n dnode7 -c wallevel -v 1
 system sh/cfg.sh -n dnode8 -c wallevel -v 1

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode5 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode6 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode7 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode8 -c maxTablesPerVnode -v 4
+
+
 print ============== step1
 print ========= start dnode1
 system sh/exec.sh -n dnode1 -s start
--- a/tests/script/unique/cluster/balance2.sim
+++ b/tests/script/unique/cluster/balance2.sim
@ -35,6 +35,16 @@ system sh/cfg.sh -n dnode6 -c mnodeEqualVnodeNum -v 0
 system sh/cfg.sh -n dnode7 -c mnodeEqualVnodeNum -v 0
 system sh/cfg.sh -n dnode8 -c mnodeEqualVnodeNum -v 0

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode5 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode6 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode7 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode8 -c maxTablesPerVnode -v 4
+
+
 print ============== step1
 print ========= start dnode1
 system sh/exec.sh -n dnode1 -s start
--- a/tests/script/unique/dnode/alternativeRole.sim
+++ b/tests/script/unique/dnode/alternativeRole.sim
@ -16,6 +16,11 @@ system sh/cfg.sh -n dnode1 -c numOfMnodes -v 3
 system sh/cfg.sh -n dnode2 -c numOfMnodes -v 3
 system sh/cfg.sh -n dnode3 -c numOfMnodes -v 3

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+
+
 print ========== step1
 system sh/exec.sh -n dnode1 -s start
 sleep 3000
--- a/tests/script/unique/dnode/balance1.sim
+++ b/tests/script/unique/dnode/balance1.sim
@ -25,6 +25,11 @@ system sh/cfg.sh -n dnode2 -c wallevel -v 2
 system sh/cfg.sh -n dnode3 -c wallevel -v 2
 system sh/cfg.sh -n dnode4 -c wallevel -v 2

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+
 print ========== step1
 system sh/exec.sh -n dnode1 -s start
 sql connect
--- a/tests/script/unique/dnode/balance2.sim
+++ b/tests/script/unique/dnode/balance2.sim
@ -12,6 +12,12 @@ system sh/cfg.sh -n dnode3 -c mnodeEqualVnodeNum -v 4
 system sh/cfg.sh -n dnode4 -c mnodeEqualVnodeNum -v 4
 system sh/cfg.sh -n dnode5 -c mnodeEqualVnodeNum -v 4

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode5 -c maxTablesPerVnode -v 4
+
 system sh/cfg.sh -n dnode1 -c wallevel -v 1
 system sh/cfg.sh -n dnode2 -c wallevel -v 1
 system sh/cfg.sh -n dnode3 -c wallevel -v 1
--- a/tests/script/unique/dnode/balance3.sim
+++ b/tests/script/unique/dnode/balance3.sim
@ -21,6 +21,13 @@ system sh/cfg.sh -n dnode4 -c wallevel -v 1
 system sh/cfg.sh -n dnode5 -c wallevel -v 1
 system sh/cfg.sh -n dnode6 -c wallevel -v 1

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode5 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode6 -c maxTablesPerVnode -v 4
+
 print ========== step1
 system sh/exec.sh -n dnode1 -s start
 sql connect
--- a/tests/script/unique/dnode/balancex.sim
+++ b/tests/script/unique/dnode/balancex.sim
@ -15,6 +15,11 @@ system sh/cfg.sh -n dnode2 -c wallevel -v 1
 system sh/cfg.sh -n dnode3 -c wallevel -v 1
 system sh/cfg.sh -n dnode4 -c wallevel -v 1

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+
 print ========== step1
 system sh/exec.sh -n dnode1 -s start
 sql connect
--- a/tests/script/unique/dnode/offline2.sim
+++ b/tests/script/unique/dnode/offline2.sim
@ -16,6 +16,13 @@ system sh/cfg.sh -n dnode1 -c mnodeEqualVnodeNum -v 4
 system sh/cfg.sh -n dnode2 -c mnodeEqualVnodeNum -v 4
 system sh/cfg.sh -n dnode3 -c mnodeEqualVnodeNum -v 4

+
+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+
+
 system sh/cfg.sh -n dnode1 -c wallevel -v 1
 system sh/cfg.sh -n dnode2 -c wallevel -v 1
 system sh/cfg.sh -n dnode3 -c wallevel -v 1
--- a/tests/script/unique/dnode/remove1.sim
+++ b/tests/script/unique/dnode/remove1.sim
@ -15,6 +15,11 @@ system sh/cfg.sh -n dnode2 -c wallevel -v 1
 system sh/cfg.sh -n dnode3 -c wallevel -v 1
 system sh/cfg.sh -n dnode4 -c wallevel -v 1

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+
 print ========== step1
 system sh/exec.sh -n dnode1 -s start
 sleep 3000
--- a/tests/script/unique/dnode/remove2.sim
+++ b/tests/script/unique/dnode/remove2.sim
@ -15,6 +15,11 @@ system sh/cfg.sh -n dnode2 -c wallevel -v 2
 system sh/cfg.sh -n dnode3 -c wallevel -v 2
 system sh/cfg.sh -n dnode4 -c wallevel -v 2

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+
 print ========== step1
 system sh/exec.sh -n dnode1 -s start
 sleep 3000
--- a/tests/script/unique/dnode/vnode_clean.sim
+++ b/tests/script/unique/dnode/vnode_clean.sim
@ -15,6 +15,11 @@ system sh/cfg.sh -n dnode2 -c wallevel -v 1
 system sh/cfg.sh -n dnode3 -c wallevel -v 1
 system sh/cfg.sh -n dnode4 -c wallevel -v 1

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+
 print ========== step1
 system sh/exec.sh -n dnode1 -s start
 sql connect
--- a/tests/script/unique/stream/table_move.sim
+++ b/tests/script/unique/stream/table_move.sim
@ -30,6 +30,11 @@ system sh/cfg.sh -n dnode2 -c maxtablesPerVnode -v 4
 system sh/cfg.sh -n dnode3 -c maxtablesPerVnode -v 4
 system sh/cfg.sh -n dnode4 -c maxtablesPerVnode -v 4

+system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxTablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxTablesPerVnode -v 4
+
 system sh/cfg.sh -n dnode1 -c numOfMnodes -v 3
 system sh/cfg.sh -n dnode2 -c numOfMnodes -v 3
 system sh/cfg.sh -n dnode3 -c numOfMnodes -v 3