diff --git a/Jenkinsfile b/Jenkinsfile
index 0d6939af31..dfe9ed4389 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -82,9 +82,9 @@ def pre_test(){
       } 
     }
     sh '''
-
     cd ${WK}
     git pull >/dev/null 
+
     export TZ=Asia/Harbin
     date
     git clean -dfx
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 5841aa0cd5..e5a55cdfd3 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -6166,7 +6166,7 @@ int32_t doFunctionsCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {
     }
 
     // projection query on super table does not compatible with "group by" syntax
-    if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0)) {
+    if (tscIsProjectionQuery(pQueryInfo)) {
       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
     }
 
diff --git a/src/kit/shell/inc/shell.h b/src/kit/shell/inc/shell.h
index d0b7149541..2374150c52 100644
--- a/src/kit/shell/inc/shell.h
+++ b/src/kit/shell/inc/shell.h
@@ -27,7 +27,7 @@
 #define MAX_IP_SIZE            20
 #define MAX_PASSWORD_SIZE      20
 #define MAX_HISTORY_SIZE       1000
-#define MAX_COMMAND_SIZE       65536
+#define MAX_COMMAND_SIZE       1048586
 #define HISTORY_FILE           ".taos_history"
 
 #define DEFAULT_RES_SHOW_NUM   100
diff --git a/src/kit/shell/src/shellCommand.c b/src/kit/shell/src/shellCommand.c
index 16545a5fe8..9173ab0efd 100644
--- a/src/kit/shell/src/shellCommand.c
+++ b/src/kit/shell/src/shellCommand.c
@@ -238,7 +238,7 @@ void resetCommand(Command *cmd, const char s[]) {
   clearScreen(cmd->endOffset + prompt_size, cmd->screenOffset + prompt_size);
   memset(cmd->buffer, 0, MAX_COMMAND_SIZE);
   memset(cmd->command, 0, MAX_COMMAND_SIZE);
-  strcpy(cmd->command, s);
+  strncpy(cmd->command, s, MAX_COMMAND_SIZE);
   int size = 0;
   int width = 0;
   getMbSizeInfo(s, &size, &width);
diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index edd7b86b1b..59b31d6172 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -2573,10 +2573,7 @@ static void* createTable(void *sarg)
   int64_t  lastPrintTime = taosGetTimestampMs();
 
   int buff_len;
-  if (superTblInfo)
-    buff_len = superTblInfo->maxSqlLen;
-  else
-    buff_len = BUFFER_SIZE;
+  buff_len = BUFFER_SIZE / 8;
 
   char *buffer = calloc(buff_len, 1);
   if (buffer == NULL) {
@@ -2624,7 +2621,7 @@ static void* createTable(void *sarg)
           return NULL;
         }
         len += snprintf(buffer + len,
-                superTblInfo->maxSqlLen - len,
+                buff_len - len,
                 "if not exists %s.%s%d using %s.%s tags %s ",
                 winfo->db_name, superTblInfo->childTblPrefix,
                 i, winfo->db_name,
@@ -2632,7 +2629,7 @@ static void* createTable(void *sarg)
         free(tagsValBuf);
         batchNum++;
         if ((batchNum < superTblInfo->batchCreateTableNum)
-                && ((superTblInfo->maxSqlLen - len)
+                && ((buff_len - len)
                     >= (superTblInfo->lenOfTagOfOneRow + 256))) {
           continue;
         }
@@ -3479,9 +3476,11 @@ static bool getMetaFromInsertJsonFile(cJSON* root) {
       if (childTblExists
               && childTblExists->type == cJSON_String
               && childTblExists->valuestring != NULL) {
-        if (0 == strncasecmp(childTblExists->valuestring, "yes", 3)) {
+        if ((0 == strncasecmp(childTblExists->valuestring, "yes", 3))
+            && (g_Dbs.db[i].drop == false)) {
           g_Dbs.db[i].superTbls[j].childTblExists = TBL_ALREADY_EXISTS;
-        } else if (0 == strncasecmp(childTblExists->valuestring, "no", 2)) {
+        } else if ((0 == strncasecmp(childTblExists->valuestring, "no", 2)
+              || (g_Dbs.db[i].drop == true))) {
           g_Dbs.db[i].superTbls[j].childTblExists = TBL_NO_EXISTS;
         } else {
           g_Dbs.db[i].superTbls[j].childTblExists = TBL_NO_EXISTS;
@@ -3527,18 +3526,20 @@ static bool getMetaFromInsertJsonFile(cJSON* root) {
       }
 
       cJSON* childTbl_limit = cJSON_GetObjectItem(stbInfo, "childtable_limit");
-      if (childTbl_limit) {
+      if ((childTbl_limit) && (g_Dbs.db[i].drop != true)
+          && (g_Dbs.db[i].superTbls[j].childTblExists == TBL_ALREADY_EXISTS)) {
         if (childTbl_limit->type != cJSON_Number) {
             printf("ERROR: failed to read json, childtable_limit\n");
             goto PARSE_OVER;
         }
         g_Dbs.db[i].superTbls[j].childTblLimit = childTbl_limit->valueint;
       } else {
-        g_Dbs.db[i].superTbls[j].childTblLimit = -1;    // select ... limit -1 means all query result
+        g_Dbs.db[i].superTbls[j].childTblLimit = -1;    // select ... limit -1 means all query result, drop = yes mean all table need recreate, limit value is invalid.
       }
 
       cJSON* childTbl_offset = cJSON_GetObjectItem(stbInfo, "childtable_offset");
-      if (childTbl_offset) {
+      if ((childTbl_offset) && (g_Dbs.db[i].drop != true)
+          && (g_Dbs.db[i].superTbls[j].childTblExists == TBL_ALREADY_EXISTS)) {
         if (childTbl_offset->type != cJSON_Number || 0 > childTbl_offset->valueint) {
             printf("ERROR: failed to read json, childtable_offset\n");
             goto PARSE_OVER;
@@ -5164,13 +5165,15 @@ static void startMultiThreadInsertData(int threads, char* db_name,
     int limit, offset;
 
     if ((superTblInfo->childTblExists == TBL_NO_EXISTS) &&
-            ((superTblInfo->childTblOffset != 0) || (superTblInfo->childTblLimit != 0))) {
+            ((superTblInfo->childTblOffset != 0) || (superTblInfo->childTblLimit >= 0))) {
       printf("WARNING: offset and limit will not be used since the child tables are not exists!\n");
     }
 
     if ((superTblInfo->childTblExists == TBL_ALREADY_EXISTS)
             && (superTblInfo->childTblOffset >= 0)) {
-      if (superTblInfo->childTblLimit < 0) {
+      if ((superTblInfo->childTblLimit < 0)
+          || ((superTblInfo->childTblOffset + superTblInfo->childTblLimit)
+            > (superTblInfo->childTblCount))) {
         superTblInfo->childTblLimit =
             superTblInfo->childTblCount - superTblInfo->childTblOffset;
       }
diff --git a/src/mnode/src/mnodeSdb.c b/src/mnode/src/mnodeSdb.c
index 381cb11952..b470dd6359 100644
--- a/src/mnode/src/mnodeSdb.c
+++ b/src/mnode/src/mnodeSdb.c
@@ -315,6 +315,10 @@ void sdbUpdateAsync() {
   taosTmrReset(sdbUpdateSyncTmrFp, 200, NULL, tsMnodeTmr, &tsSdbTmr);
 }
 
+static int node_cmp(const void *l, const void *r) {
+  return ((SNodeInfo *)l)->nodeId - ((SNodeInfo *)r)->nodeId;
+}
+
 int32_t sdbUpdateSync(void *pMnodes) {
   SMInfos *pMinfos = pMnodes;
   if (!mnodeIsRunning()) {
@@ -382,6 +386,8 @@ int32_t sdbUpdateSync(void *pMnodes) {
     return TSDB_CODE_SUCCESS;
   }
 
+  qsort(syncCfg.nodeInfo, syncCfg.replica, sizeof(syncCfg.nodeInfo[0]), node_cmp);
+
   sdbInfo("vgId:1, work as mnode, replica:%d", syncCfg.replica);
   for (int32_t i = 0; i < syncCfg.replica; ++i) {
     sdbInfo("vgId:1, mnode:%d, %s:%d", syncCfg.nodeInfo[i].nodeId, syncCfg.nodeInfo[i].nodeFqdn,
@@ -1131,4 +1137,4 @@ static void *sdbWorkerFp(void *pWorker) {
 
 int32_t sdbGetReplicaNum() {
   return tsSdbMgmt.cfg.replica;
-}
\ No newline at end of file
+}
diff --git a/src/query/src/qAggMain.c b/src/query/src/qAggMain.c
index f18d093b89..e47545da95 100644
--- a/src/query/src/qAggMain.c
+++ b/src/query/src/qAggMain.c
@@ -2771,14 +2771,16 @@ static void percentile_function(SQLFunctionCtx *pCtx) {
   SPercentileInfo *pInfo = GET_ROWCELL_INTERBUF(pResInfo);
 
   if (pCtx->currentStage == REPEAT_SCAN && pInfo->stage == 0) {
+    pInfo->stage += 1;
+
     // all data are null, set it completed
     if (pInfo->numOfElems == 0) {
       pResInfo->complete = true;
+      
+      return;
     } else {
       pInfo->pMemBucket = tMemBucketCreate(pCtx->inputBytes, pCtx->inputType, pInfo->minval, pInfo->maxval);
     }
-
-    pInfo->stage += 1;
   }
 
   // the first stage, only acquire the min/max value
@@ -2857,14 +2859,16 @@ static void percentile_function_f(SQLFunctionCtx *pCtx, int32_t index) {
   SPercentileInfo *pInfo = (SPercentileInfo *)GET_ROWCELL_INTERBUF(pResInfo);
 
   if (pCtx->currentStage == REPEAT_SCAN && pInfo->stage == 0) {
+    pInfo->stage += 1;
+
     // all data are null, set it completed
     if (pInfo->numOfElems == 0) {
       pResInfo->complete = true;
+
+      return;
     } else {
       pInfo->pMemBucket = tMemBucketCreate(pCtx->inputBytes, pCtx->inputType, pInfo->minval, pInfo->maxval);
     }
-
-    pInfo->stage += 1;
   }
 
   if (pInfo->stage == 0) {
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index bd5fdda0f9..dda67d77b2 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -4015,7 +4015,7 @@ static SFillColInfo* createFillColInfo(SExprInfo* pExpr, int32_t numOfOutput, in
   return pFillCol;
 }
 
-int32_t doInitQInfo(SQInfo *pQInfo, STSBuf *pTsBuf, SArray* prevResult, void *tsdb, int32_t vgId, bool isSTableQuery) {
+int32_t doInitQInfo(SQInfo *pQInfo, STSBuf *pTsBuf, void *tsdb, int32_t vgId, bool isSTableQuery) {
   SQueryRuntimeEnv *pRuntimeEnv = &pQInfo->runtimeEnv;
 
   SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
@@ -4026,8 +4026,6 @@ int32_t doInitQInfo(SQInfo *pQInfo, STSBuf *pTsBuf, SArray* prevResult, void *ts
   pQuery->timeWindowInterpo = timeWindowInterpoRequired(pQuery);
   pQuery->stabledev = isStabledev(pQuery);
 
-  pRuntimeEnv->prevResult = prevResult;
-
   setScanLimitationByResultBuffer(pQuery);
 
   int32_t code = setupQueryHandle(tsdb, pQInfo, isSTableQuery);
@@ -6383,6 +6381,8 @@ int32_t initQInfo(SQueryTableMsg *pQueryMsg, void *tsdb, int32_t vgId, SQInfo *p
   SArray* prevResult = NULL;
   if (pQueryMsg->prevResultLen > 0) {
     prevResult = interResFromBinary(param->prevResult, pQueryMsg->prevResultLen);
+    
+    pRuntimeEnv->prevResult = prevResult;    
   }
 
   pQuery->precision = tsdbGetCfg(tsdb)->precision;
@@ -6404,7 +6404,7 @@ int32_t initQInfo(SQueryTableMsg *pQueryMsg, void *tsdb, int32_t vgId, SQInfo *p
   }
 
   // filter the qualified
-  if ((code = doInitQInfo(pQInfo, pTsBuf, prevResult, tsdb, vgId, isSTable)) != TSDB_CODE_SUCCESS) {
+  if ((code = doInitQInfo(pQInfo, pTsBuf, tsdb, vgId, isSTable)) != TSDB_CODE_SUCCESS) {
     goto _error;
   }
 
diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index 1746f8d2db..e7e0586636 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -217,8 +217,8 @@ python3 ./test.py -f query/floatCompare.py
 python3 ./test.py -f query/query1970YearsAf.py
 python3 ./test.py -f query/bug3351.py
 python3 ./test.py -f query/bug3375.py
-
-
+python3 ./test.py -f query/queryJoin10tables.py
+python3 ./test.py -f query/queryStddevWithGroupby.py
 
 #stream
 python3 ./test.py -f stream/metric_1.py
diff --git a/tests/pytest/query/queryJoin10tables.py b/tests/pytest/query/queryJoin10tables.py
new file mode 100644
index 0000000000..01a7397d44
--- /dev/null
+++ b/tests/pytest/query/queryJoin10tables.py
@@ -0,0 +1,201 @@
+###################################################################
+#           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 taos
+import sys
+
+from util.log import *
+from util.sql import *
+from util.cases import *
+from util.dnodes import *
+
+class TDTestCase:
+
+    def init(self, conn, logSql):
+        tdLog.debug(f"start to excute {__file__}")
+        tdSql.init(conn.cursor())
+
+    def createtable(self):
+
+        # create stbles
+        tdSql.execute("create table if not exists stb1 (ts timestamp, c1 int) tags(t11 int, t12 int)")
+        tdSql.execute("create table if not exists stb2 (ts timestamp, c2 int) tags(t21 int, t22 int)")
+        tdSql.execute("create table if not exists stb3 (ts timestamp, c3 int) tags(t31 int, t32 int)")
+        tdSql.execute("create table if not exists stb4 (ts timestamp, c4 int) tags(t41 int, t42 int)")
+        tdSql.execute("create table if not exists stb5 (ts timestamp, c5 int) tags(t51 int, t52 int)")
+        tdSql.execute("create table if not exists stb6 (ts timestamp, c6 int) tags(t61 int, t62 int)")
+        tdSql.execute("create table if not exists stb7 (ts timestamp, c7 int) tags(t71 int, t72 int)")
+        tdSql.execute("create table if not exists stb8 (ts timestamp, c8 int) tags(t81 int, t82 int)")
+        tdSql.execute("create table if not exists stb9 (ts timestamp, c9 int) tags(t91 int, t92 int)")
+        tdSql.execute("create table if not exists stb10 (ts timestamp, c10 int) tags(t101 int, t102 int)")
+        tdSql.execute("create table if not exists stb11 (ts timestamp, c11 int) tags(t111 int, t112 int)")
+
+        # create normal tables
+        tdSql.execute("create table t10 using stb1 tags(0, 9)")
+        tdSql.execute("create table t11 using stb1 tags(1, 8)")
+        tdSql.execute("create table t12 using stb1 tags(2, 7)")
+        tdSql.execute("create table t13 using stb1 tags(3, 6)")
+        tdSql.execute("create table t14 using stb1 tags(4, 5)")
+        tdSql.execute("create table t15 using stb1 tags(5, 4)")
+        tdSql.execute("create table t16 using stb1 tags(6, 3)")
+        tdSql.execute("create table t17 using stb1 tags(7, 2)")
+        tdSql.execute("create table t18 using stb1 tags(8, 1)")
+        tdSql.execute("create table t19 using stb1 tags(9, 0)")
+        tdSql.execute("create table t110 using stb1 tags(10, 10)")
+
+        tdSql.execute("create table t20 using stb2 tags(0, 9)")
+        tdSql.execute("create table t21 using stb2 tags(1, 8)")
+        tdSql.execute("create table t22 using stb2 tags(2, 7)")
+
+        tdSql.execute("create table t30 using stb3 tags(0, 9)")
+        tdSql.execute("create table t31 using stb3 tags(1, 8)")
+        tdSql.execute("create table t32 using stb3 tags(2, 7)")
+
+    def inserttable(self):
+        for i in range(100):
+            if i<60:
+                tdSql.execute(f"insert into t20 values('2020-10-01 00:00:{i}.000', {i})")
+                tdSql.execute(f"insert into t21 values('2020-10-01 00:00:{i}.000', {i})")
+                tdSql.execute(f"insert into t22 values('2020-10-01 00:00:{i}.000', {i})")
+                tdSql.execute(f"insert into t30 values('2020-10-01 00:00:{i}.000', {i})")
+                tdSql.execute(f"insert into t31 values('2020-10-01 00:00:{i}.000', {i})")
+                tdSql.execute(f"insert into t32 values('2020-10-01 00:00:{i}.000', {i})")
+            else:
+                tdSql.execute(f"insert into t20 values('2020-10-01 00:01:{i-60}.000', {i})")
+                tdSql.execute(f"insert into t21 values('2020-10-01 00:01:{i-60}.000', {i})")
+                tdSql.execute(f"insert into t22 values('2020-10-01 00:01:{i-60}.000', {i})")
+                tdSql.execute(f"insert into t30 values('2020-10-01 00:01:{i-60}.000', {i})")
+                tdSql.execute(f"insert into t31 values('2020-10-01 00:01:{i-60}.000', {i})")
+                tdSql.execute(f"insert into t32 values('2020-10-01 00:01:{i-60}.000', {i})")
+            for j in range(11):
+                if i<60:
+                    tdSql.execute(f"insert into t1{j} values('2020-10-01 00:00:{i}.000', {i})")
+                else:
+                    tdSql.execute(f"insert into t1{j} values('2020-10-01 00:01:{i-60}.000', {i})")
+
+    def queryjointable(self):
+        tdSql.error(
+            '''select  from t10,t11,t12,t13,t14,t15,t16,t17,t18,t19 
+            where t10.ts=t11.ts and t10.ts=t12.ts and t10.ts=t13.ts and t10.ts=t14.ts and t10.ts=t15.ts 
+            and t10.ts=t16.ts and t10.ts=t17.ts and t10.ts=t18.ts and t10.ts=t19.ts'''
+        )
+        tdSql.error("select * from t10 where t10.ts=t11.ts")
+        tdSql.error("select * from where t10.ts=t11.ts")
+        tdSql.error("select * from t10,t11,t12,t13,t14,t15,t16,t17,t18,t19")
+        tdSql.error("select * from stb1, stb2, stb3 where stb1.ts=stb2.ts and stb1.ts=stb3.ts")
+        tdSql.error("select * from stb1, stb2, stb3 where stb1.t11=stb2.t21 and stb1.t11=stb3.t31")
+        tdSql.error("select * from stb1, stb2, stb3")
+        tdSql.error(
+            '''select  * from stb1 
+            join stb2 on stb1.ts=stb2.ts and stb1.t11=stb2.t21 
+            join stb3 on stb1.ts=stb3.ts and stb1.t11=stb3.t31'''
+        )
+        tdSql.error("select * from t10 join t11 on t10.ts=t11.ts join t12 on t11.ts=t12.ts")
+        tdSql.query(
+            '''select * from stb1,stb2,stb3 
+            where stb1.ts=stb2.ts and stb1.ts=stb3.ts and stb1.t11=stb2.t21 and stb1.t11 =stb3.t31'''
+        )
+        tdSql.checkRows(300)
+        tdSql.query("select * from t11,t12,t13 where t11.ts=t12.ts and t11.ts=t13.ts")
+        tdSql.checkRows(100)
+        tdSql.error("selec * from t11,t12,t13 where t11.ts=t12.ts and t11.ts=t13.ts")
+        tdSql.error("select * form t11,t12,t13 where t11.ts=t12.ts and t11.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts and t11.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts <> t12.ts and t11.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts != t12.ts and t11.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts or t11.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.c1=t12.c2 and t11.c1=t13.c3")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts and t11.ts=t13.c3 and t11.c1=t13.ts")
+        tdSql.error("select ts from t11,t12,t13 when t11.ts=t12.ts and t11.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=ts and t11.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts and t11.ts=t13.ts and ts>100")
+        tdSql.error("select * from t11,t12,stb1 when t11.ts=t12.ts and t11.ts=stb1.ts")
+        tdSql.error("select t14.ts from t11,t12,t13 when t11.ts=t12.ts and t11.ts=t13.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts and t11.ts=t13.ts1")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts and t11.ts=t14.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts")
+        tdSql.error("select * from t11,t12,t13 when t11.ts=t12.ts and t11.ts=t13.ts and t11.c1=t13.c3")
+        tdSql.error(
+            '''select * from t10,t11,t12,t13,t14,t15,t16,t17,t18,t19,t20 
+            where t10.ts=t11.ts and t10.ts=t12.ts and t10.ts=t13.ts and t10.ts=t14.ts and t10.ts=t15.ts 
+            and t10.ts=t16.ts and t10.ts=t17.ts and t10.ts=t18.ts and t10.ts=t19.ts and t10.ts=t20.ts'''
+        )
+        tdSql.error(
+            '''select * from t10,t11,t12,t13,t14,t15,t16,t17,t18,t19,t20 
+            where t10.ts=t11.ts and t10.ts=t12.ts and t10.ts=t13.ts and t10.ts=t14.ts and t10.ts=t15.ts 
+            and t10.ts=t16.ts and t10.ts=t17.ts and t10.ts=t18.ts and t10.ts=t19.ts'''
+        )
+        tdSql.error(
+            '''select * from t10,t11,t12,t13,t14,t15,t16,t17,t18,t19
+            where t10.ts=t11.ts and t10.ts=t12.ts and t10.ts=t13.ts and t10.ts=t14.ts and t10.ts=t15.ts 
+            and t10.ts=t16.ts and t10.ts=t17.ts and t10.ts=t18.ts and t10.ts=t19.ts and t10.c1=t19.c1'''
+        )
+        tdSql.error(
+            '''select * from stb1,stb2,stb3 
+                        where stb1.ts=stb2.ts and stb1.ts=stb3.ts and stb1.t11=stb2.t21'''
+        )
+        tdSql.error(
+            '''select * from stb1,stb2,stb3 
+                        where stb1.ts=stb2.ts and stb1.t11=stb2.t21 and stb1.t11=stb3.t31'''
+        )
+        tdSql.error(
+            '''select * from stb1,stb2,stb3 
+                        where stb1.ts=stb2.ts and stb1.ts=stb3.ts and stb1.t11=stb2.t21 and stb1.t11=stb3.t31
+                        and stb1.t12=stb3=t32'''
+        )
+        tdSql.error(
+            '''select * from stb1,stb2,stb3,stb4,stb5,stb6,stb7,stb8,stb9,stb10,stb11
+            where stb1.ts=stb2.ts and stb1.ts=stb3.ts and stb1.ts=stb4.ts and stb1.ts=stb5.ts and stb1.ts=stb6.ts 
+            and stb1.ts=stb7.ts and stb1.ts=stb8.ts and stb1.ts=stb9.ts and stb1.ts=stb10.ts and stb1.ts=stb11.ts 
+            and stb1.t11=stb2.t21 and stb1.t11=stb3.t31 and stb1.t11=stb4.t41 and stb1.t11=stb5.t51 
+            and stb1.t11=stb6.t61 and stb1.t11=stb7.t71 and stb1.t11=stb8.t81 and stb1.t11=stb9.t91 
+            and stb1.t11=stb10.t101 and stb1.t11=stb11.t111'''
+        )
+        tdSql.error(
+            '''select * from stb1,stb2,stb3,stb4,stb5,stb6,stb7,stb8,stb9,stb10
+            where stb1.ts=stb2.ts and stb1.ts=stb3.ts and stb1.ts=stb4.ts and stb1.ts=stb5.ts and stb1.ts=stb6.ts 
+            and stb1.ts=stb7.ts and stb1.ts=stb8.ts and stb1.ts=stb9.ts and stb1.ts=stb10.ts and stb1.t11=stb2.t21 
+            and stb1.t11=stb3.t31 and stb1.t11=stb4.t41 and stb1.t11=stb5.t51 and stb1.t11=stb6.t61 
+            and stb1.t11=stb7.t71 and stb1.t11=stb8.t81 and stb1.t11=stb9.t91 and stb1.t11=stb10.t101 
+            and stb1.t12=stb11.t102'''
+        )
+
+    def run(self):
+        tdSql.prepare()
+
+        tdLog.printNoPrefix("==========step1:create table")
+        self.createtable()
+
+        tdLog.printNoPrefix("==========step2:insert data")
+        self.inserttable()
+
+        tdLog.printNoPrefix("==========step3:query timestamp type")
+        self.queryjointable()
+
+        # after wal and sync, check again
+        tdSql.query("show dnodes")
+        index = tdSql.getData(0, 0)
+        tdDnodes.stop(index)
+        tdDnodes.start(index)
+
+        tdLog.printNoPrefix("==========step4:query again after wal")
+        self.queryjointable()
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())
\ No newline at end of file
diff --git a/tests/pytest/query/queryStddevWithGroupby.py b/tests/pytest/query/queryStddevWithGroupby.py
new file mode 100644
index 0000000000..aee88ca9c5
--- /dev/null
+++ b/tests/pytest/query/queryStddevWithGroupby.py
@@ -0,0 +1,68 @@
+###################################################################
+#           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
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def querysqls(self):
+        tdSql.query("select stddev(c1) from t10 group by c1")
+        tdSql.checkRows(6)
+        tdSql.checkData(0, 0, 0)
+        tdSql.checkData(1, 0, 0)
+        tdSql.checkData(2, 0, 0)
+        tdSql.checkData(3, 0, 0)
+        tdSql.checkData(4, 0, 0)
+        tdSql.checkData(5, 0, 0)
+        tdSql.query("select stddev(c2) from t10")
+        tdSql.checkData(0, 0, 0.5)
+
+    def run(self):
+        tdSql.execute("drop database if exists db")
+        tdSql.execute("create database  if not exists db keep 36500")
+        tdSql.execute("use db")
+
+        tdLog.printNoPrefix("==========step1:create table && insert data")
+        tdSql.execute("create stable stb1 (ts timestamp , c1 int ,c2 float) tags(t1 int)")
+        tdSql.execute("create table t10 using stb1 tags(1)")
+        tdSql.execute("insert into t10 values ('1969-12-31 00:00:00.000', 2,1)")
+        tdSql.execute("insert into t10 values ('1970-01-01 00:00:00.000', 3,1)")
+        tdSql.execute("insert into t10 values (0, 4,1)")
+        tdSql.execute("insert into t10 values (now-18725d, 1,2)")
+        tdSql.execute("insert into t10 values ('2021-04-06 00:00:00.000', 5,2)")
+        tdSql.execute("insert into t10 values (now+1d,6,2)")
+
+        tdLog.printNoPrefix("==========step2:query and check")
+        self.querysqls()
+
+        tdLog.printNoPrefix("==========step3:after wal,check again")
+        tdSql.query("show dnodes")
+        index = tdSql.getData(0, 0)
+        tdDnodes.stop(index)
+        tdDnodes.start(index)
+        self.querysqls()
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
diff --git a/tests/script/general/parser/groupby.sim b/tests/script/general/parser/groupby.sim
index dd7331054c..124e76e85c 100644
--- a/tests/script/general/parser/groupby.sim
+++ b/tests/script/general/parser/groupby.sim
@@ -220,6 +220,7 @@ sql_error select sum(c3), ts, c2 from group_tb0 where c1 < 20 group by c1;
 sql_error select sum(c3), first(ts), c2 from group_tb0 where c1 < 20 group by c1;
 sql_error select first(c3), ts, c1, c2 from group_tb0 where c1 < 20 group by c1;
 sql_error select first(c3), last(c3), ts, c1 from group_tb0 where c1 < 20 group by c1;
+sql_error select ts from group_tb0 group by c1;
 
 #===========================interval=====not support======================
 sql_error select count(*), c1 from group_tb0 where c1<20 interval(1y) group by c1;