diff --git a/cmake/cmake.version b/cmake/cmake.version
index d38ac40b90c932b41717d6d16dadc176a842a2b2..de85025a8c972b2a5a4434c6993f2ae48efa5a52 100644
--- a/cmake/cmake.version
+++ b/cmake/cmake.version
@@ -2,7 +2,7 @@
 IF (DEFINED VERNUMBER)
   SET(TD_VER_NUMBER ${VERNUMBER})
 ELSE ()
-  SET(TD_VER_NUMBER "3.0.3.0")
+  SET(TD_VER_NUMBER "3.0.3.1")
 ENDIF ()
 
 IF (DEFINED VERCOMPATIBLE)
diff --git a/packaging/testpackage.sh b/packaging/testpackage.sh
index 9959d290e74bf82db4bb6ad840d3cb3c6131e16d..97226a86b5a4cdb9eac50abee4da54dfdfa46996 100755
--- a/packaging/testpackage.sh
+++ b/packaging/testpackage.sh
@@ -107,7 +107,7 @@ elif [ ${testFile} = "tools" ];then
     originTdpPath="taosTools-${originversion}"
     packageName="${tdPath}-Linux-${cpuType}${packageLite}.${packageType}"
     originPackageName="${originTdpPath}-Linux-${cpuType}${packageLite}.${packageType}"    
-    installCmd="install-tools.sh"
+    installCmd="install-taostools.sh"
 fi
 
 
@@ -333,7 +333,7 @@ if [[ ${packageName} =~ "Lite" ]]  ||   ([[ ${packageName} =~ "x64" ]] && [[ ${p
         wgetFile taosTools-2.1.3-Linux-x64.tar.gz v2.1.3 web
         tar xf taosTools-2.1.3-Linux-x64.tar.gz  
     fi
-    cd taosTools-2.1.3 && bash install-tools.sh
+    cd taosTools-2.1.3 && bash install-taostools.sh
 elif  ([[ ${packageName} =~ "arm64" ]] && [[ ${packageName} =~ "client" ]]);then
     echoColor G "===== install taos-tools arm when package is arm64-client ====="
     cd ${installPath}
@@ -342,7 +342,7 @@ elif  ([[ ${packageName} =~ "arm64" ]] && [[ ${packageName} =~ "client" ]]);then
         tar xf taosTools-2.1.3-Linux-arm64.tar.gz
     fi    
     
-    cd taosTools-2.1.3 && bash install-tools.sh
+    cd taosTools-2.1.3 && bash install-taostools.sh
 fi
 
 echoColor G  "===== start TDengine ====="
@@ -361,18 +361,18 @@ rm -rf ${installPath}/${tdPath}/
 #     cd ${installPath}
 #     wgetFile taosTools-2.1.2-Linux-x64.tar.gz .
 #     tar xf taosTools-2.1.2-Linux-x64.tar.gz
-#     cd taosTools-2.1.2 && bash install-tools.sh
+#     cd taosTools-2.1.2 && bash install-taostools.sh
 # elif [[ ${packageName} =~ "Lite" ]] &&  [[ ${packageName} =~ "deb" ]] ;then
 #     echoColor G "===== install taos-tools when package is lite or client ====="
 #     cd ${installPath}
 #     wgetFile taosTools-2.1.2-Linux-x64.tar.gz .
 #     tar xf taosTools-2.1.2-Linux-x64.tar.gz
-#     cd taosTools-2.1.2 && bash install-tools.sh
+#     cd taosTools-2.1.2 && bash install-taostools.sh
 # elif [[ ${packageName} =~ "Lite" ]] &&  [[ ${packageName} =~ "rpm" ]]  ;then
 #     echoColor G "===== install taos-tools when package is lite or client ====="
 #     cd ${installPath}
 #     wgetFile taosTools-2.1.2-Linux-x64.tar.gz .
 #     tar xf taosTools-2.1.2-Linux-x64.tar.gz
-#     cd taosTools-2.1.2 && bash install-tools.sh
+#     cd taosTools-2.1.2 && bash install-taostools.sh
 # fi
 
diff --git a/source/libs/executor/inc/tsort.h b/source/libs/executor/inc/tsort.h
index cff568aebc0c26fb2e9c22c7a027fa9edb4dd81a..d51a24bb43253e09d6ab21e6a1785d6ef6b5e5ff 100644
--- a/source/libs/executor/inc/tsort.h
+++ b/source/libs/executor/inc/tsort.h
@@ -44,7 +44,8 @@ typedef struct SSortSource {
     void* param;
     bool  onlyRef;
   };
-
+  int64_t fetchUs;
+  int64_t fetchNum;
 } SSortSource;
 
 typedef struct SMsortComparParam {
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index ee92805d2798d91ed67aba13c4b52a1c1d931c3b..ce647014aee772bed9fc19b01ad3f438d4857743 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -31,6 +31,7 @@
 #include "thash.h"
 #include "ttypes.h"
 
+#define MULTI_READER_MAX_TABLE_NUM 5000
 #define SET_REVERSE_SCAN_FLAG(_info) ((_info)->scanFlag = REVERSE_SCAN)
 #define SWITCH_ORDER(n)              (((n) = ((n) == TSDB_ORDER_ASC) ? TSDB_ORDER_DESC : TSDB_ORDER_ASC))
 
@@ -43,7 +44,9 @@ typedef struct STableMergeScanSortSourceParam {
   SOperatorInfo* pOperator;
   int32_t        readerIdx;
   uint64_t       uid;
-  SSDataBlock*   inputBlock;
+  SSDataBlock*   inputBlock;  
+  bool           multiReader;
+  STsdbReader*   dataReader;
 } STableMergeScanSortSourceParam;
 
 static bool processBlockWithProbability(const SSampleExecInfo* pInfo);
@@ -2588,6 +2591,7 @@ static SSDataBlock* getTableDataBlockImpl(void* param) {
   SExecTaskInfo*                  pTaskInfo = pOperator->pTaskInfo;
   int32_t                         readIdx = source->readerIdx;
   SSDataBlock*                    pBlock = source->inputBlock;
+  int32_t                         code = 0;
 
   SQueryTableDataCond* pQueryCond = taosArrayGet(pInfo->queryConds, readIdx);
 
@@ -2595,17 +2599,20 @@ static SSDataBlock* getTableDataBlockImpl(void* param) {
   void*        p = tableListGetInfo(pTaskInfo->pTableInfoList, readIdx + pInfo->tableStartIndex);
   SReadHandle* pHandle = &pInfo->base.readHandle;
 
-  int32_t code =
-      tsdbReaderOpen(pHandle->vnode, pQueryCond, p, 1, pBlock, &pInfo->base.dataReader, GET_TASKID(pTaskInfo));
-  if (code != 0) {
-    T_LONG_JMP(pTaskInfo->env, code);
+  if (NULL == source->dataReader || !source->multiReader) {
+    code = tsdbReaderOpen(pHandle->vnode, pQueryCond, p, 1, pBlock, &source->dataReader, GET_TASKID(pTaskInfo));
+    if (code != 0) {
+      T_LONG_JMP(pTaskInfo->env, code);
+    }
   }
-
+  
+  pInfo->base.dataReader = source->dataReader;
   STsdbReader* reader = pInfo->base.dataReader;
   qTrace("tsdb/read-table-data: %p, enter next reader", reader);
   while (tsdbNextDataBlock(reader)) {
     if (isTaskKilled(pTaskInfo)) {
       tsdbReleaseDataBlock(reader);
+      pInfo->base.dataReader = NULL;
       T_LONG_JMP(pTaskInfo->env, pTaskInfo->code);
     }
 
@@ -2639,14 +2646,18 @@ static SSDataBlock* getTableDataBlockImpl(void* param) {
     pInfo->base.readRecorder.elapsedTime += (taosGetTimestampUs() - st) / 1000.0;
 
     qTrace("tsdb/read-table-data: %p, close reader", reader);
-    tsdbReaderClose(pInfo->base.dataReader);
+    if (!source->multiReader) {
+      tsdbReaderClose(pInfo->base.dataReader);
+      source->dataReader = NULL;
+    }
     pInfo->base.dataReader = NULL;
     return pBlock;
   }
 
-  qDebug("8");
-
-  tsdbReaderClose(pInfo->base.dataReader);
+  if (!source->multiReader) {
+    tsdbReaderClose(pInfo->base.dataReader);
+    source->dataReader = NULL;
+  }
   pInfo->base.dataReader = NULL;
   return NULL;
 }
@@ -2718,6 +2729,7 @@ int32_t startGroupTableMergeScan(SOperatorInfo* pOperator) {
     STableMergeScanSortSourceParam param = {0};
     param.readerIdx = i;
     param.pOperator = pOperator;
+    param.multiReader = (numOfTable <= MULTI_READER_MAX_TABLE_NUM) ? true : false;
     param.inputBlock = createOneDataBlock(pInfo->pResBlock, false);
     blockDataEnsureCapacity(param.inputBlock, pOperator->resultInfo.capacity);
 
@@ -2761,6 +2773,8 @@ int32_t stopGroupTableMergeScan(SOperatorInfo* pOperator) {
   for (int32_t i = 0; i < numOfTable; ++i) {
     STableMergeScanSortSourceParam* param = taosArrayGet(pInfo->sortSourceParams, i);
     blockDataDestroy(param->inputBlock);
+    tsdbReaderClose(param->dataReader);
+    param->dataReader = NULL;
   }
   taosArrayClear(pInfo->sortSourceParams);
 
@@ -2803,9 +2817,6 @@ SSDataBlock* getSortedTableMergeScanBlockData(SSortHandle* pHandle, SSDataBlock*
   qDebug("%s get sorted row block, rows:%d, limit:%" PRId64, GET_TASKID(pTaskInfo), pResBlock->info.rows,
          pInfo->limitInfo.numOfOutputRows);
 
-  if (limitReached) {
-    resetLimitInfoForNextGroup(&pInfo->limitInfo);
-  }
   return (pResBlock->info.rows > 0) ? pResBlock : NULL;
 }
 
@@ -2858,6 +2869,7 @@ SSDataBlock* doTableMergeScan(SOperatorInfo* pOperator) {
       pInfo->tableStartIndex = pInfo->tableEndIndex + 1;
       pInfo->groupId = tableListGetInfo(pTaskInfo->pTableInfoList, pInfo->tableStartIndex)->groupId;
       startGroupTableMergeScan(pOperator);
+      resetLimitInfoForNextGroup(&pInfo->limitInfo);      
     }
   }
 
@@ -2873,15 +2885,17 @@ void destroyTableMergeScanOperatorInfo(void* param) {
   for (int32_t i = 0; i < numOfTable; i++) {
     STableMergeScanSortSourceParam* p = taosArrayGet(pTableScanInfo->sortSourceParams, i);
     blockDataDestroy(p->inputBlock);
+    tsdbReaderClose(p->dataReader);
+    p->dataReader = NULL;
   }
 
+  tsdbReaderClose(pTableScanInfo->base.dataReader);
+  pTableScanInfo->base.dataReader = NULL;
+
   taosArrayDestroy(pTableScanInfo->sortSourceParams);
   tsortDestroySortHandle(pTableScanInfo->pSortHandle);
   pTableScanInfo->pSortHandle = NULL;
 
-  tsdbReaderClose(pTableScanInfo->base.dataReader);
-  pTableScanInfo->base.dataReader = NULL;
-
   for (int i = 0; i < taosArrayGetSize(pTableScanInfo->queryConds); i++) {
     SQueryTableDataCond* pCond = taosArrayGet(pTableScanInfo->queryConds, i);
     taosMemoryFree(pCond->colList);
@@ -2898,8 +2912,6 @@ void destroyTableMergeScanOperatorInfo(void* param) {
   taosArrayDestroy(pTableScanInfo->pSortInfo);
   cleanupExprSupp(&pTableScanInfo->base.pseudoSup);
 
-  tsdbReaderClose(pTableScanInfo->base.dataReader);
-  pTableScanInfo->base.dataReader = NULL;
   taosLRUCacheCleanup(pTableScanInfo->base.metaCache.pTableMetaEntryCache);
 
   taosMemoryFreeClear(param);
diff --git a/source/libs/executor/src/tsort.c b/source/libs/executor/src/tsort.c
index 291b0cf5155438a760ff7cbdf5dfe36cf5b79ea9..6c8e581b3fe837aa1bf101bf8cf6748a2cac5f4d 100644
--- a/source/libs/executor/src/tsort.c
+++ b/source/libs/executor/src/tsort.c
@@ -108,12 +108,18 @@ static int32_t sortComparCleanup(SMsortComparParam* cmpParam) {
   return TSDB_CODE_SUCCESS;
 }
 
-void tsortClearOrderdSource(SArray* pOrderedSource) {
+void tsortClearOrderdSource(SArray* pOrderedSource, int64_t *fetchUs, int64_t *fetchNum) {
   for (size_t i = 0; i < taosArrayGetSize(pOrderedSource); i++) {
     SSortSource** pSource = taosArrayGet(pOrderedSource, i);
     if (NULL == *pSource) {
       continue;
     }
+
+    if (fetchUs) {
+      *fetchUs += (*pSource)->fetchUs;
+      *fetchNum += (*pSource)->fetchNum;
+    }
+    
     // release pageIdList
     if ((*pSource)->pageIdList) {
       taosArrayDestroy((*pSource)->pageIdList);
@@ -147,7 +153,10 @@ void tsortDestroySortHandle(SSortHandle* pSortHandle) {
   taosMemoryFreeClear(pSortHandle->idStr);
   blockDataDestroy(pSortHandle->pDataBlock);
 
-  tsortClearOrderdSource(pSortHandle->pOrderedSource);
+  int64_t fetchUs = 0, fetchNum = 0;
+  tsortClearOrderdSource(pSortHandle->pOrderedSource, &fetchUs, &fetchNum);
+  qError("all source fetch time: %" PRId64 "us num:%" PRId64 " %s", fetchUs, fetchNum, pSortHandle->idStr);
+  
   taosArrayDestroy(pSortHandle->pOrderedSource);
   taosMemoryFreeClear(pSortHandle);
 }
@@ -307,7 +316,7 @@ static int32_t sortComparInit(SMsortComparParam* pParam, SArray* pSources, int32
     }
 
     int64_t et = taosGetTimestampUs();
-    qDebug("init for merge sort completed, elapsed time:%.2f ms, %s", (et - st) / 1000.0, pHandle->idStr);
+    qError("init for merge sort completed, elapsed time:%.2f ms, %s", (et - st) / 1000.0, pHandle->idStr);
   }
 
   return code;
@@ -365,7 +374,10 @@ static int32_t adjustMergeTreeForNextTuple(SSortSource* pSource, SMultiwayMergeT
         releaseBufPage(pHandle->pBuf, pPage);
       }
     } else {
+      int64_t st = taosGetTimestampUs();      
       pSource->src.pBlock = pHandle->fetchfp(((SSortSource*)pSource)->param);
+      pSource->fetchUs += taosGetTimestampUs() - st;
+      pSource->fetchNum++;
       if (pSource->src.pBlock == NULL) {
         (*numOfCompleted) += 1;
         pSource->src.rowIndex = -1;
@@ -602,7 +614,7 @@ static int32_t doInternalMergeSort(SSortHandle* pHandle) {
       }
     }
 
-    tsortClearOrderdSource(pHandle->pOrderedSource);
+    tsortClearOrderdSource(pHandle->pOrderedSource, NULL, NULL);
     taosArrayAddAll(pHandle->pOrderedSource, pResList);
     taosArrayDestroy(pResList);
 
@@ -644,7 +656,7 @@ static int32_t createInitialSources(SSortHandle* pHandle) {
     SSortSource*  source = *pSource;
     *pSource = NULL;
 
-    tsortClearOrderdSource(pHandle->pOrderedSource);
+    tsortClearOrderdSource(pHandle->pOrderedSource, NULL, NULL);
 
     while (1) {
       SSDataBlock* pBlock = pHandle->fetchfp(source->param);
diff --git a/source/libs/parser/src/parCalcConst.c b/source/libs/parser/src/parCalcConst.c
index b2fc88add1506336869dce1c33c19ff9e077a4d2..33b8a686ae2c9ddcb5997d74ab8be8c35d29697f 100644
--- a/source/libs/parser/src/parCalcConst.c
+++ b/source/libs/parser/src/parCalcConst.c
@@ -361,11 +361,29 @@ static bool notRefByOrderBy(SColumnNode* pCol, SNodeList* pOrderByList) {
   return !cxt.hasThisCol;
 }
 
+static bool isSetUselessCol(SSetOperator* pSetOp, int32_t index, SExprNode* pProj) {
+  if (!isUselessCol(pProj)) {
+    return false;
+  }
+
+  SNodeList* pLeftProjs = getChildProjection(pSetOp->pLeft);
+  if (!isUselessCol((SExprNode*)nodesListGetNode(pLeftProjs, index))) {
+    return false;
+  }
+
+  SNodeList* pRightProjs = getChildProjection(pSetOp->pRight);
+  if (!isUselessCol((SExprNode*)nodesListGetNode(pRightProjs, index))) {
+    return false;
+  }
+
+  return true;
+}
+
 static int32_t calcConstSetOpProjections(SCalcConstContext* pCxt, SSetOperator* pSetOp, bool subquery) {
   int32_t index = 0;
   SNode*  pProj = NULL;
   WHERE_EACH(pProj, pSetOp->pProjectionList) {
-    if (subquery && notRefByOrderBy((SColumnNode*)pProj, pSetOp->pOrderByList) && isUselessCol((SExprNode*)pProj)) {
+    if (subquery && notRefByOrderBy((SColumnNode*)pProj, pSetOp->pOrderByList) && isSetUselessCol(pSetOp, index, (SExprNode*)pProj)) {
       ERASE_NODE(pSetOp->pProjectionList);
       eraseSetOpChildProjection(pSetOp, index);
       continue;
diff --git a/source/libs/parser/src/parTranslater.c b/source/libs/parser/src/parTranslater.c
index a3c79b57577ac79169d6dfb88e835514e9717819..68c93f8ca940644b79891f98bfdc483f8139c546 100644
--- a/source/libs/parser/src/parTranslater.c
+++ b/source/libs/parser/src/parTranslater.c
@@ -1422,6 +1422,9 @@ static int32_t translateAggFunc(STranslateContext* pCxt, SFunctionNode* pFunc) {
   if (isCountStar(pFunc)) {
     return rewriteCountStar(pCxt, pFunc);
   }
+  if (isCountNotNullValue(pFunc)) {
+    return rewriteCountNotNullValue(pCxt, pFunc);
+  }  
   if (isCountTbname(pFunc)) {
     return rewriteCountTbname(pCxt, pFunc);
   }
diff --git a/tests/parallel_test/cases.task b/tests/parallel_test/cases.task
index cf967c9553e0cfcaaa0c38c78b80375d26360449..8c8d41d5b617f64c1cbf4173d2bb59df99220243 100644
--- a/tests/parallel_test/cases.task
+++ b/tests/parallel_test/cases.task
@@ -853,6 +853,7 @@
 ,,y,script,./test.sh -f tsim/parser/topbot.sim
 ,,y,script,./test.sh -f tsim/parser/union_sysinfo.sim
 ,,y,script,./test.sh -f tsim/parser/slimit_limit.sim
+,,y,script,./test.sh -f tsim/parser/table_merge_limit.sim
 ,,y,script,./test.sh -f tsim/query/tagLikeFilter.sim
 ,,y,script,./test.sh -f tsim/query/charScalarFunction.sim
 ,,y,script,./test.sh -f tsim/query/explain.sim
diff --git a/tests/parallel_test/container_build.sh b/tests/parallel_test/container_build.sh
index edb9b4ab3cae80af399f3ed3b22d4416bf1902d8..80236cf604d63e4d9c8fdddfa81aeaf16fb64944 100755
--- a/tests/parallel_test/container_build.sh
+++ b/tests/parallel_test/container_build.sh
@@ -68,8 +68,8 @@ docker run \
     -v ${REP_REAL_PATH}/community/contrib/libuv/:${REP_DIR}/community/contrib/libuv \
     -v ${REP_REAL_PATH}/community/contrib/lz4/:${REP_DIR}/community/contrib/lz4 \
     -v ${REP_REAL_PATH}/community/contrib/zlib/:${REP_DIR}/community/contrib/zlib \
-    -v ${REP_REAL_PATH}/community/contrib/jemalloc/:${REP_DIR}/community/contrib/jemalloc \
-    --rm --ulimit core=-1 taos_test:v1.0 sh -c "pip uninstall taospy -y;pip3 install taospy==2.7.2;cd $REP_DIR;rm -rf debug;mkdir -p debug;cd debug;cmake .. -DBUILD_HTTP=false -DBUILD_TOOLS=true -DBUILD_TEST=true -DWEBSOCKET=true -DBUILD_TAOSX=true;make -j || exit 1"
+    --rm --ulimit core=-1 taos_test:v1.0 sh -c "pip uninstall taospy -y;pip3 install taospy==2.7.2;cd $REP_DIR;rm -rf debug;mkdir -p debug;cd debug;cmake .. -DBUILD_HTTP=false -DBUILD_TOOLS=true -DBUILD_TEST=true -DWEBSOCKET=true -DBUILD_TAOSX=true -DJEMALLOC_ENABLED=true;make -j || exit 1"
+ # -v ${REP_REAL_PATH}/community/contrib/jemalloc/:${REP_DIR}/community/contrib/jemalloc \
 
 if [[ -d ${WORKDIR}/debugNoSan  ]] ;then
     echo "delete  ${WORKDIR}/debugNoSan"
@@ -97,7 +97,7 @@ docker run \
     -v ${REP_REAL_PATH}/community/contrib/lz4/:${REP_DIR}/community/contrib/lz4 \
     -v ${REP_REAL_PATH}/community/contrib/zlib/:${REP_DIR}/community/contrib/zlib \
     -v ${REP_REAL_PATH}/community/contrib/jemalloc/:${REP_DIR}/community/contrib/jemalloc \
-    --rm --ulimit core=-1 taos_test:v1.0 sh -c "pip uninstall taospy -y;pip3 install taospy==2.7.2;cd $REP_DIR;rm -rf debug;mkdir -p debug;cd debug;cmake .. -DBUILD_HTTP=false -DBUILD_TOOLS=true -DBUILD_TEST=true -DWEBSOCKET=true   -DBUILD_SANITIZER=1  -DTOOLS_SANITIZE=true -DTOOLS_BUILD_TYPE=Debug -DBUILD_TAOSX=true;make -j || exit 1 "
+    --rm --ulimit core=-1 taos_test:v1.0 sh -c "pip uninstall taospy -y;pip3 install taospy==2.7.2;cd $REP_DIR;rm -rf debug;mkdir -p debug;cd debug;cmake .. -DBUILD_HTTP=false -DBUILD_TOOLS=true -DBUILD_TEST=true -DWEBSOCKET=true   -DBUILD_SANITIZER=1  -DTOOLS_SANITIZE=true -DTOOLS_BUILD_TYPE=Debug -DBUILD_TAOSX=true -DJEMALLOC_ENABLED=true;make -j || exit 1 "
 
 mv  ${REP_REAL_PATH}/debug  ${WORKDIR}/debugSan
 
diff --git a/tests/script/coverage_test.sh b/tests/script/coverage_test.sh
index 3f99dde5442c5f0c9e88b5ea1df37f7a64e54003..ad87528f9c414907581f7d052d14779fb73799ff 100755
--- a/tests/script/coverage_test.sh
+++ b/tests/script/coverage_test.sh
@@ -12,6 +12,7 @@ fi
 today=`date +"%Y%m%d"`
 TDENGINE_DIR=/root/TDengine
 JDBC_DIR=/root/taos-connector-jdbc
+TAOSKEEPER_DIR=/root/taoskeeper
 TDENGINE_COVERAGE_REPORT=$TDENGINE_DIR/tests/coverage-report-$today.log
 
 # Color setting
@@ -171,6 +172,24 @@ function runJDBCCases() {
 	echo -e "### JDBC test result: $summary ###" | tee -a $TDENGINE_COVERAGE_REPORT
 }
 
+function runTaosKeeperCases() {
+	echo "=== Run taoskeeper cases ==="
+
+	cd $TAOSKEEPER_DIR
+	git checkout -- .
+	git reset --hard HEAD
+	git checkout master
+	git pull
+
+	stopTaosd
+	stopTaosadapter
+
+	taosd -c /etc/taos >> /dev/null 2>&1 &
+	taosadapter >> /dev/null 2>&1 &
+
+	go mod tidy && go test -v ./...
+}
+
 function runTest() {
 	echo "run Test"
 	
@@ -182,6 +201,7 @@ function runTest() {
 	runSimCases
 	runPythonCases
 	runJDBCCases
+	runTaosKeeperCases
 	
 	stopTaosd	
 	cd $TDENGINE_DIR/tests/script
@@ -199,7 +219,7 @@ function lcovFunc {
 	lcov -d . --capture --rc lcov_branch_coverage=1 --rc genhtml_branch_coverage=1 --no-external -b $TDENGINE_DIR -o coverage.info
 
 	# remove exclude paths
-	if [ "$branch" == "3.0" ]; then
+	if [ "$branch" == "main" ] ; then
 		lcov --remove coverage.info \
 			'*/contrib/*' '*/tests/*' '*/test/*' '*/tools/*' '*/libs/sync/*'\
 			'*/AccessBridgeCalls.c' '*/ttszip.c' '*/dataInserter.c' '*/tlinearhash.c' '*/tsimplehash.c' '*/tsdbDiskData.c'\
@@ -209,6 +229,8 @@ function lcovFunc {
 			'*/tthread.c' '*/tversion.c' '*/ctgDbg.c' '*/schDbg.c' '*/qwDbg.c' '*/tencode.h' '*/catalog.c'\
 			'*/tqSnapshot.c' '*/tsdbSnapshot.c''*/metaSnapshot.c' '*/smaSnapshot.c' '*/tqOffsetSnapshot.c'\
 			'*/vnodeSnapshot.c' '*/metaSnapshot.c' '*/tsdbSnapshot.c' '*/mndGrant.c' '*/mndSnode.c' '*/streamRecover.c'\
+			'*/osAtomic.c' '*/osDir.c' '*/osFile.c' '*/osMath.c' '*/osSignal.c' '*/osSleep.c' '*/osString.c' '*/osSystem.c'\
+			'*/osThread.c' '*/osTime.c' '*/osTimezone.c' \
 		       	--rc lcov_branch_coverage=1 -o coverage.info
 	else	
 		lcov --remove coverage.info \
diff --git a/tests/script/tsim/parser/table_merge_limit.sim b/tests/script/tsim/parser/table_merge_limit.sim
new file mode 100644
index 0000000000000000000000000000000000000000..7d67b6d3a270c8587c85123963b564c82ea18762
--- /dev/null
+++ b/tests/script/tsim/parser/table_merge_limit.sim
@@ -0,0 +1,47 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/exec.sh -n dnode1 -s start
+sql connect
+
+$dbPrefix = m_fl_db
+$tbPrefix = m_fl_tb
+$mtPrefix = m_fl_mt
+$tbNum = 2
+$rowNum = 513
+$totalNum = $tbNum * $rowNum
+$ts0 = 1537146000000
+$delta = 600000
+print ========== fill.sim
+$i = 0
+$db = $dbPrefix . $i
+$mt = $mtPrefix . $i
+
+sql drop database $db -x step1
+step1:
+sql create database $db vgroups 1
+sql use $db
+sql create table $mt (ts timestamp, c1 int) tags(tgcol int)
+
+$i = 0
+$ts = $ts0
+while $i < $tbNum
+  $tb = $tbPrefix . $i
+  sql create table $tb using $mt tags( $i )
+
+  $x = 0
+  while $x < $rowNum
+    $xs = $x * $delta
+    $ts = $ts0 + $xs
+    sql insert into $tb values ( $ts , $x )
+    $x = $x + 1
+  endw
+
+  $i = $i + 1
+endw
+
+sql select * from $mt order by ts limit 10
+if $rows != 10 then
+  return -1
+endi
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT
diff --git a/tests/system-test/2-query/tsbsQuery.py b/tests/system-test/2-query/tsbsQuery.py
index e64b3ed0c75b13f4c5712f8ff656dfb7d853aa52..0e2975cdba02fc7b5a6ffda879b56f712649b43f 100644
--- a/tests/system-test/2-query/tsbsQuery.py
+++ b/tests/system-test/2-query/tsbsQuery.py
@@ -214,13 +214,13 @@ class TDTestCase:
         sql=f"SELECT model,count(state_changed) FROM (SELECT _rowts,model,diff(broken_down) AS state_changed FROM (SELECT ts,model,tb,cast(cast(floor(2*(nzs)) as bool) as int) AS broken_down FROM (SELECT _wstart as ts,model,tbname as tb, sum(cast(cast(status as bool) as int))/count(cast(cast(status as bool) as int)) AS nzs FROM {dbname}.diagnostics WHERE ts >= 1451606400000 AND ts < 1451952001000 partition BY tbname,model interval(10m))order by ts) partition BY tb,model ) WHERE state_changed = 1 partition BY model;"
         tdSql.query(f"{sql}")
         tdSql.checkRows(46)
-        # for i in range(2):
-        #     tdSql.query("%s"%sql)
-        #     quertR1=tdSql.queryResult
-        #     for j in  range(50):
-        #         tdSql.query("%s"%sql)
-        #         quertR2=tdSql.queryResult
-        #         assert quertR1 == quertR2 , "%s != %s ,The results of multiple queries are different" %(quertR1,quertR2)
+        for i in range(2):
+            tdSql.query("%s"%sql)
+            quertR1=tdSql.queryResult
+            for j in  range(50):
+                tdSql.query("%s"%sql)
+                quertR2=tdSql.queryResult
+                assert quertR1 == quertR2 , "%s != %s ,The results of multiple queries are different" %(quertR1,quertR2)
 
 
         #it's already supported: