diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 280c8b7ec2b8887d161fce04e5c22efecc0c4e46..dca70d0cbbd141223c921c9fe0258ef7c37fa62d 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -5833,14 +5833,43 @@ static int32_t doAddGroupbyColumnsOnDemand(SSqlCmd* pCmd, SQueryInfo* pQueryInfo
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t doTagFunctionCheck(SQueryInfo* pQueryInfo) {
+  bool tagProjection = false;
+  bool tableCounting = false;
+
+  int32_t numOfCols = (int32_t) tscSqlExprNumOfExprs(pQueryInfo);
+
+  for (int32_t i = 0; i < numOfCols; ++i) {
+    SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, i);
+    int32_t functionId = pExpr->functionId;
+
+    if (functionId == TSDB_FUNC_TAGPRJ) {
+      tagProjection = true;
+      continue;
+    }
+
+    if (functionId == TSDB_FUNC_COUNT) {
+      assert(pExpr->colInfo.colId == TSDB_TBNAME_COLUMN_INDEX);
+      tableCounting = true;
+    }
+  }
+
+  return (tableCounting && tagProjection)? -1:0;
+}
+
 int32_t doFunctionsCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo) {
   const char* msg1 = "functions/columns not allowed in group by query";
   const char* msg2 = "projection query on columns not allowed";
   const char* msg3 = "group by not allowed on projection query";
   const char* msg4 = "retrieve tags not compatible with group by or interval query";
+  const char* msg5 = "functions can not be mixed up";
 
   // only retrieve tags, group by is not supportted
   if (tscQueryTags(pQueryInfo)) {
+    if (doTagFunctionCheck(pQueryInfo) != TSDB_CODE_SUCCESS) {
+      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg5);
+    }
+
     if (pQueryInfo->groupbyExpr.numOfGroupCols > 0 || pQueryInfo->interval.interval > 0) {
       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg4);
     } else {
diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index 063b6af0e621a2e0609577b7a0a1ac75324ab047..96fdde4fd61958efbf306a3b578a4b357a3ea930 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -188,8 +188,10 @@ static int64_t doTSBlockIntersect(SSqlObj* pSql, SJoinSupporter* pSupporter1, SJ
   tsBufFlush(output2);
 
   tsBufDestroy(pSupporter1->pTSBuf);
+  pSupporter1->pTSBuf = NULL;
   tsBufDestroy(pSupporter2->pTSBuf);
-
+  pSupporter2->pTSBuf = NULL;
+    
   TSKEY et = taosGetTimestampUs();
   tscDebug("%p input1:%" PRId64 ", input2:%" PRId64 ", final:%" PRId64 " in %d vnodes for secondary query after ts blocks "
            "intersecting, skey:%" PRId64 ", ekey:%" PRId64 ", numOfVnode:%d, elapsed time:%" PRId64 " us",
@@ -219,12 +221,9 @@ SJoinSupporter* tscCreateJoinSupporter(SSqlObj* pSql, int32_t index) {
   assert (pSupporter->uid != 0);
 
   taosGetTmpfilePath("join-", pSupporter->path);
-  pSupporter->f = fopen(pSupporter->path, "w");
 
-  // todo handle error
-  if (pSupporter->f == NULL) {
-    tscError("%p failed to create tmp file:%s, reason:%s", pSql, pSupporter->path, strerror(errno));
-  }
+  // do NOT create file here to reduce crash generated file left issue
+  pSupporter->f = NULL;
 
   return pSupporter;
 }
@@ -244,12 +243,19 @@ static void tscDestroyJoinSupporter(SJoinSupporter* pSupporter) {
 
   tscFieldInfoClear(&pSupporter->fieldsInfo);
 
+  if (pSupporter->pTSBuf != NULL) {
+    tsBufDestroy(pSupporter->pTSBuf);
+    pSupporter->pTSBuf = NULL;
+  }
+
+  unlink(pSupporter->path);
+  
   if (pSupporter->f != NULL) {
     fclose(pSupporter->f);
-    unlink(pSupporter->path);
     pSupporter->f = NULL;
   }
 
+
   if (pSupporter->pVgroupTables != NULL) {
     taosArrayDestroy(pSupporter->pVgroupTables);
     pSupporter->pVgroupTables = NULL;
@@ -526,6 +532,8 @@ static void quitAllSubquery(SSqlObj* pSqlObj, SJoinSupporter* pSupporter) {
     tscError("%p all subquery return and query failed, global code:%s", pSqlObj, tstrerror(pSqlObj->res.code));
     freeJoinSubqueryObj(pSqlObj);
   }
+
+  tscDestroyJoinSupporter(pSupporter);
 }
 
 // update the query time range according to the join results on timestamp
@@ -921,6 +929,22 @@ static void tsCompRetrieveCallback(void* param, TAOS_RES* tres, int32_t numOfRow
   }
 
   if (numOfRows > 0) {  // write the compressed timestamp to disk file
+    if(pSupporter->f == NULL) {
+      pSupporter->f = fopen(pSupporter->path, "w");
+
+      if (pSupporter->f == NULL) {
+        tscError("%p failed to create tmp file:%s, reason:%s", pSql, pSupporter->path, strerror(errno));
+        
+        pParentSql->res.code = TAOS_SYSTEM_ERROR(errno);
+
+        quitAllSubquery(pParentSql, pSupporter);
+        
+        tscAsyncResultOnError(pParentSql);
+
+        return;
+      }
+    }
+      
     fwrite(pRes->data, (size_t)pRes->numOfRows, 1, pSupporter->f);
     fclose(pSupporter->f);
     pSupporter->f = NULL;
@@ -930,6 +954,9 @@ static void tsCompRetrieveCallback(void* param, TAOS_RES* tres, int32_t numOfRow
       tscError("%p invalid ts comp file from vnode, abort subquery, file size:%d", pSql, numOfRows);
 
       pParentSql->res.code = TAOS_SYSTEM_ERROR(errno);
+
+      quitAllSubquery(pParentSql, pSupporter);
+      
       tscAsyncResultOnError(pParentSql);
 
       return;
diff --git a/src/query/src/qAggMain.c b/src/query/src/qAggMain.c
index 4b4c8b1426e027b508af846fbfe3914989ce7c0d..9fccb0d627fc4574ef90865e94e43c10cbdfc9bf 100644
--- a/src/query/src/qAggMain.c
+++ b/src/query/src/qAggMain.c
@@ -1268,12 +1268,14 @@ static void min_function_f(SQLFunctionCtx *pCtx, int32_t index) {
   }
 
 static void stddev_function(SQLFunctionCtx *pCtx) {
-  // the second stage to calculate standard deviation
   SStddevInfo *pStd = GET_ROWCELL_INTERBUF(GET_RES_INFO(pCtx));
   
-  if (pStd->stage == 0) {  // the first stage is to calculate average value
+  if (pStd->stage == 0) {
+    // the first stage is to calculate average value
     avg_function(pCtx);
-  } else {
+  } else if (pStd->num > 0) {
+    // the second stage to calculate standard deviation
+    // if pStd->num == 0, there are no numbers in the first round check. No need to do the second round
     double *retVal = &pStd->res;
     double  avg = pStd->avg;
     
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index fc7b3bdd6d115920a8ab693b38b6ff56af54e326..7b544040bfa97d2bab210b2e1833154137f98b40 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -548,7 +548,7 @@ static STimeWindow getActiveTimeWindow(SResultRowInfo *pWindowResInfo, int64_t t
  if (pWindowResInfo->curIndex == -1) {  // the first window, from the previous stored value
     w.skey = pWindowResInfo->prevSKey;
     if (pQuery->interval.intervalUnit == 'n' || pQuery->interval.intervalUnit == 'y') {
-      w.ekey = taosTimeAdd(w.skey, pQuery->interval.interval, pQuery->interval.intervalUnit, pQuery->precision);
+      w.ekey = taosTimeAdd(w.skey, pQuery->interval.interval, pQuery->interval.intervalUnit, pQuery->precision) - 1;
     } else {
       w.ekey = w.skey + pQuery->interval.interval - 1;
     }
diff --git a/src/util/src/hash.c b/src/util/src/hash.c
index 1a9c6d314b3fd8a6b3ad6928b6faa4f7fad32757..ede3e1e4ce3d1c9e5cadbd6bc21c009f0c5f5ca3 100644
--- a/src/util/src/hash.c
+++ b/src/util/src/hash.c
@@ -477,8 +477,6 @@ void taosHashEmpty(SHashObj *pHashObj) {
     return;
   }
 
-  uDebug("hash:%p cleanup hash table", pHashObj);
-
   SHashNode *pNode, *pNext;
 
   __wr_lock(&pHashObj->lock, pHashObj->type);
diff --git a/tests/script/general/parser/first_last_query.sim b/tests/script/general/parser/first_last_query.sim
index 52d888b04d1b055bbbc3c8509832c96579e4320f..9537b417f3cd1a38658b2afc95be88c6af366f20 100644
--- a/tests/script/general/parser/first_last_query.sim
+++ b/tests/script/general/parser/first_last_query.sim
@@ -37,6 +37,7 @@ if $data02 != 0 then
 endi 
 print data03 = $data03
 if $data03 != 0.00000 then
+  print expect 0.00000, actual: $data03
   return -1  
 endi    
 if $data04 != 0.000000000 then
diff --git a/tests/script/general/parser/function.sim b/tests/script/general/parser/function.sim
index 78b63c2baf460907a2d88836c52f157a8753c89c..a358ca7fcea971a230b0ce79b6c7f02c21c8734b 100644
--- a/tests/script/general/parser/function.sim
+++ b/tests/script/general/parser/function.sim
@@ -361,3 +361,15 @@ endi
 if $data10 != @20-07-30 17:43:59.000@ then
   return -1
 endi
+
+print =================>td-2610
+sql select stddev(k) from tm2 where ts='2020-12-29 18:46:19.109'
+if $rows != 0 then
+  print expect 0, actual:$rows
+  return -1
+endi
+
+sql select twa(k) from tm2 where ts='2020-12-29 18:46:19.109'
+if $rows != 0 then
+  return -1
+endi
diff --git a/tests/script/general/parser/groupby.sim b/tests/script/general/parser/groupby.sim
index 44bae6f242f12e5a6430df64520631d0ac3af073..606ad444d15b193e79b98283077fed751af9dd7b 100644
--- a/tests/script/general/parser/groupby.sim
+++ b/tests/script/general/parser/groupby.sim
@@ -606,6 +606,10 @@ sql insert into t1 values ('2020-03-27 04:21:16.000', 1)('2020-03-27 04:31:17.00
 sql insert into t2 values ('2020-03-27 04:11:16.000', 1)('2020-03-27 04:11:17.000', 2) ('2020-03-27 04:11:18.000', 3) ('2020-03-27 04:11:19.000', 4) ; 
 sql insert into t2 values ('2020-03-27 04:21:16.000', 1)('2020-03-27 04:31:17.000', 2) ('2020-03-27 04:51:18.000', 3) ('2020-03-27 05:10:19.000', 4) ; 
 
+print =================>TD-2665
+sql_error create table txx as select avg(c) as t from st;
+sql_error create table txx1 as select avg(c) as t from t1;
+
 print =================>TD-2236
 sql select first(ts),last(ts) from t1 group by c;
 if $rows != 4 then
diff --git a/tests/script/general/parser/testSuite.sim b/tests/script/general/parser/testSuite.sim
index a2cf305fae890bf6685962d1c9817bf2a17c54c6..cddd28817ee82e693ea430876dab52fc2a3a28c1 100644
--- a/tests/script/general/parser/testSuite.sim
+++ b/tests/script/general/parser/testSuite.sim
@@ -1,50 +1,50 @@
-run general/parser/alter.sim
-sleep 500
-run general/parser/alter1.sim
-sleep 500
-run general/parser/alter_stable.sim
-sleep 500
-run general/parser/auto_create_tb.sim
-sleep 500
-run general/parser/auto_create_tb_drop_tb.sim
-sleep 500
-run general/parser/col_arithmetic_operation.sim
-sleep 500
-run general/parser/columnValue.sim
-sleep 500
-run general/parser/commit.sim
-sleep 500
-run general/parser/create_db.sim
-sleep 500
-run general/parser/create_mt.sim
-sleep 500
-run general/parser/create_tb.sim
-sleep 500
-run general/parser/dbtbnameValidate.sim
-sleep 500
-run general/parser/fill.sim
-sleep 500
-run general/parser/fill_stb.sim
-sleep 500
-#run general/parser/fill_us.sim               #
-sleep 500
-run general/parser/first_last.sim
-sleep 500
-run general/parser/import_commit1.sim
-sleep 500
-run general/parser/import_commit2.sim
-sleep 500
-run general/parser/import_commit3.sim
-sleep 500
-#run general/parser/import_file.sim
-sleep 500
-run general/parser/insert_tb.sim
-sleep 500
-run general/parser/tags_dynamically_specifiy.sim
-sleep 500
-run general/parser/interp.sim
-sleep 500
-run general/parser/lastrow.sim
+#run general/parser/alter.sim
+#sleep 500
+#run general/parser/alter1.sim
+#sleep 500
+#run general/parser/alter_stable.sim
+#sleep 500
+#run general/parser/auto_create_tb.sim
+#sleep 500
+#run general/parser/auto_create_tb_drop_tb.sim
+#sleep 500
+#run general/parser/col_arithmetic_operation.sim
+#sleep 500
+#run general/parser/columnValue.sim
+#sleep 500
+#run general/parser/commit.sim
+#sleep 500
+#run general/parser/create_db.sim
+#sleep 500
+#run general/parser/create_mt.sim
+#sleep 500
+#run general/parser/create_tb.sim
+#sleep 500
+#run general/parser/dbtbnameValidate.sim
+#sleep 500
+#run general/parser/fill.sim
+#sleep 500
+#run general/parser/fill_stb.sim
+#sleep 500
+##run general/parser/fill_us.sim               #
+#sleep 500
+#run general/parser/first_last.sim
+#sleep 500
+#run general/parser/import_commit1.sim
+#sleep 500
+#run general/parser/import_commit2.sim
+#sleep 500
+#run general/parser/import_commit3.sim
+#sleep 500
+##run general/parser/import_file.sim
+#sleep 500
+#run general/parser/insert_tb.sim
+#sleep 500
+#run general/parser/tags_dynamically_specifiy.sim
+#sleep 500
+#run general/parser/interp.sim
+#sleep 500
+#run general/parser/lastrow.sim
 sleep 500
 run general/parser/limit.sim
 sleep 500