diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 52169226436b3aa75fe76ca073de756b7b227550..2d77905d866061e0a454af094a8928e5771d94e7 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -1246,7 +1246,7 @@ size_t blockDataGetCapacityInRow(const SSDataBlock* pBlock, size_t pageSize) {
   }
 
   int32_t newRows = (payloadSize - additional) / rowSize;
-  ASSERT(newRows <= nRows && newRows > 1);
+  ASSERT(newRows <= nRows && newRows >= 1);
 
   return newRows;
 }
diff --git a/source/dnode/mnode/impl/src/mndShow.c b/source/dnode/mnode/impl/src/mndShow.c
index def6c06896149c4f7c871099d1d9dc7166dc2dd1..6b70825ed46bdfffb703d3c508971a22ec145b82 100644
--- a/source/dnode/mnode/impl/src/mndShow.c
+++ b/source/dnode/mnode/impl/src/mndShow.c
@@ -257,6 +257,7 @@ static int32_t mndProcessRetrieveSysTableReq(SRpcMsg *pReq) {
       terrno = rowsRead;
       mDebug("show:0x%" PRIx64 ", retrieve completed", pShow->id);
       mndReleaseShowObj(pShow, true);
+      blockDataDestroy(pBlock);
       return -1;
     }
 
diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index b36d3566bf0abaf3c12760cb6fdc7311195e75da..dc12f47c655b7b80836a64d2c6eb31284bc38e46 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -94,10 +94,8 @@ typedef struct SLimit {
 typedef struct STableScanAnalyzeInfo SFileBlockLoadRecorder;
 
 typedef struct STaskCostInfo {
-  int64_t created;
-  int64_t start;
-  int64_t end;
-
+  int64_t  created;
+  int64_t  start;
   uint64_t loadStatisTime;
   uint64_t loadFileBlockTime;
   uint64_t loadDataInCacheTime;
@@ -185,7 +183,7 @@ typedef struct SExecTaskInfo {
   STaskCostInfo    cost;
   int64_t          owner;  // if it is in execution
   int32_t          code;
-  uint64_t         totalRows;            // total number of rows
+//  uint64_t         totalRows;            // total number of rows
   struct {
     char          *tablename;
     char          *dbname;
@@ -676,6 +674,7 @@ int32_t setSDataBlockFromFetchRsp(SSDataBlock* pRes, SLoadRemoteDataInfo* pLoadI
                                   SArray* pColList);
 void    getAlignQueryTimeWindow(SInterval* pInterval, int32_t precision, int64_t key, STimeWindow* win);
 int32_t getTableScanInfo(SOperatorInfo* pOperator, int32_t *order, int32_t* scanFlag);
+int32_t getBufferPgSize(int32_t rowSize, uint32_t* defaultPgsz, uint32_t* defaultBufsz);
 
 void    doSetOperatorCompleted(SOperatorInfo* pOperator);
 void    doFilter(const SNode* pFilterNode, SSDataBlock* pBlock, SArray* pColMatchInfo);
diff --git a/source/libs/executor/src/executorMain.c b/source/libs/executor/src/executorMain.c
index 6689def7a756c70e0adf36171a61c8f2279d11f7..7757825733153741d6e83404051578f7f4e2aef8 100644
--- a/source/libs/executor/src/executorMain.c
+++ b/source/libs/executor/src/executorMain.c
@@ -126,8 +126,7 @@ int32_t qExecTask(qTaskInfo_t tinfo, SSDataBlock** pRes, uint64_t *useconds) {
   if (ret != TSDB_CODE_SUCCESS) {
     pTaskInfo->code = ret;
     cleanUpUdfs();
-    qDebug("%s task abort due to error/cancel occurs, code:%s", GET_TASKID(pTaskInfo),
-           tstrerror(pTaskInfo->code));
+    qDebug("%s task abort due to error/cancel occurs, code:%s", GET_TASKID(pTaskInfo), tstrerror(pTaskInfo->code));
     return pTaskInfo->code;
   }
 
@@ -142,12 +141,13 @@ int32_t qExecTask(qTaskInfo_t tinfo, SSDataBlock** pRes, uint64_t *useconds) {
     *useconds = pTaskInfo->cost.elapsedTime;
   }
 
+  cleanUpUdfs();
+
   int32_t current = (*pRes != NULL)? (*pRes)->info.rows:0;
-  pTaskInfo->totalRows += current;
+  uint64_t total = pTaskInfo->pRoot->resultInfo.totalRows;
 
-  cleanUpUdfs();
   qDebug("%s task suspended, %d rows returned, total:%" PRId64 " rows, in sinkNode:%d, elapsed:%.2f ms",
-         GET_TASKID(pTaskInfo), current, pTaskInfo->totalRows, 0, el/1000.0);
+         GET_TASKID(pTaskInfo), current, total, 0, el/1000.0);
 
   atomic_store_64(&pTaskInfo->owner, 0);
   return pTaskInfo->code;
@@ -197,7 +197,7 @@ int32_t qIsTaskCompleted(qTaskInfo_t qinfo) {
 
 void qDestroyTask(qTaskInfo_t qTaskHandle) {
   SExecTaskInfo* pTaskInfo = (SExecTaskInfo*) qTaskHandle;
-  qDebug("%s execTask completed, numOfRows:%"PRId64, GET_TASKID(pTaskInfo), pTaskInfo->totalRows);
+  qDebug("%s execTask completed, numOfRows:%"PRId64, GET_TASKID(pTaskInfo), pTaskInfo->pRoot->resultInfo.totalRows);
 
   queryCostStatis(pTaskInfo);   // print the query cost summary
   doDestroyTask(pTaskInfo);
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index a4a4b2b50657c79983a25c244b15213c506a429a..34f9c528a35ba46ea2e979c100c46dd6d8b972db 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -3938,6 +3938,21 @@ static void destroyOperatorInfo(SOperatorInfo* pOperator) {
   taosMemoryFreeClear(pOperator);
 }
 
+int32_t getBufferPgSize(int32_t rowSize, uint32_t* defaultPgsz, uint32_t* defaultBufsz) {
+  *defaultPgsz = 4096;
+  while (*defaultPgsz < rowSize * 4) {
+    *defaultPgsz <<= 1u;
+  }
+
+  // at least four pages need to be in buffer
+  *defaultBufsz = 4096 * 256;
+  if ((*defaultBufsz) <= (*defaultPgsz)) {
+    (*defaultBufsz) = (*defaultPgsz) * 4;
+  }
+
+  return 0;
+}
+
 int32_t doInitAggInfoSup(SAggSupporter* pAggSup, SqlFunctionCtx* pCtx, int32_t numOfOutput, size_t keyBufSize,
                          const char* pKey) {
   _hash_fn_t hashFn = taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY);
@@ -3950,18 +3965,11 @@ int32_t doInitAggInfoSup(SAggSupporter* pAggSup, SqlFunctionCtx* pCtx, int32_t n
     return TSDB_CODE_OUT_OF_MEMORY;
   }
 
-  uint32_t defaultPgsz = 4096;
-  while (defaultPgsz < pAggSup->resultRowSize * 4) {
-    defaultPgsz <<= 1u;
-  }
-
-  // at least four pages need to be in buffer
-  int32_t defaultBufsz = 4096 * 256;
-  if (defaultBufsz <= defaultPgsz) {
-    defaultBufsz = defaultPgsz * 4;
-  }
+  uint32_t defaultPgsz  = 0;
+  uint32_t defaultBufsz = 0;
+  getBufferPgSize(pAggSup->resultRowSize, &defaultPgsz, &defaultBufsz);
 
-  int32_t code = createDiskbasedBuf(&pAggSup->pResultBuf, defaultPgsz, defaultBufsz, pKey, TD_TMP_DIR_PATH);
+  int32_t  code = createDiskbasedBuf(&pAggSup->pResultBuf, defaultPgsz, defaultBufsz, pKey, TD_TMP_DIR_PATH);
   if (code != TSDB_CODE_SUCCESS) {
     return code;
   }
diff --git a/source/libs/executor/src/groupoperator.c b/source/libs/executor/src/groupoperator.c
index 2600c170606c1f0b309d0662cd7b8390672343fe..3ab296f62e127db9f36797f04c1f1543460333d2 100644
--- a/source/libs/executor/src/groupoperator.c
+++ b/source/libs/executor/src/groupoperator.c
@@ -439,7 +439,6 @@ static void doHashPartition(SOperatorInfo* pOperator, SSDataBlock* pBlock) {
           memcpy(data + (*columnLen), src, varDataTLen(src));
           int32_t v = (data + (*columnLen) + varDataTLen(src) - (char*)pPage);
           ASSERT(v > 0);
-          printf("len:%d\n", v);
 
           contentLen = varDataTLen(src);
         }
@@ -490,16 +489,13 @@ void* getCurrentDataGroupInfo(const SPartitionOperatorInfo* pInfo, SDataGroupInf
 
     int32_t *rows = (int32_t*) pPage;
     if (*rows >= pInfo->rowCapacity) {
+      // release buffer
+      releaseBufPage(pInfo->pBuf, pPage);
+
       // add a new page for current group
       int32_t pageId = 0;
       pPage = getNewBufPage(pInfo->pBuf, 0, &pageId);
       taosArrayPush(p->pPageList, &pageId);
-
-//      // number of rows
-//      *(int32_t*) pPage = 0;
-//
-//      uint64_t* groupId = (pPage + sizeof(int32_t));
-//      *groupId = 0;
       memset(pPage, 0, getBufPageSize(pInfo->pBuf));
     }
   }
@@ -566,6 +562,7 @@ static SSDataBlock* buildPartitionResult(SOperatorInfo* pOperator) {
   blockDataFromBuf1(pInfo->binfo.pRes, page, pInfo->rowCapacity);
 
   pInfo->pageIndex += 1;
+  releaseBufPage(pInfo->pBuf, page);
 
   blockDataUpdateTsWindow(pInfo->binfo.pRes, 0);
   pInfo->binfo.pRes->info.groupId = pGroupInfo->groupId;
@@ -631,7 +628,11 @@ SOperatorInfo* createPartitionOperatorInfo(SOperatorInfo* downstream, SExprInfo*
     goto _error;
   }
 
-  int32_t code = createDiskbasedBuf(&pInfo->pBuf, 4096, 4096 * 256, pTaskInfo->id.str, TD_TMP_DIR_PATH);
+  uint32_t defaultPgsz  = 0;
+  uint32_t defaultBufsz = 0;
+  getBufferPgSize(pResultBlock->info.rowSize, &defaultPgsz, &defaultBufsz);
+
+  int32_t code = createDiskbasedBuf(&pInfo->pBuf, defaultPgsz, defaultBufsz, pTaskInfo->id.str, TD_TMP_DIR_PATH);
   if (code != TSDB_CODE_SUCCESS) {
     goto _error;
   }
diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 12496eec551c3793cede8b6e065b31d4e554052e..0d47595b3e25214482ab8b6442e521ff00ebdc05 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -707,6 +707,7 @@ int32_t substrFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOu
 
 int32_t castFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   int16_t inputType  = GET_PARAM_TYPE(&pInput[0]);
+  int16_t inputLen   = GET_PARAM_BYTES(&pInput[0]);
   int16_t outputType = GET_PARAM_TYPE(&pOutput[0]);
   int64_t outputLen  = GET_PARAM_BYTES(&pOutput[0]);
 
@@ -718,15 +719,15 @@ int32_t castFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutp
       colDataAppendNULL(pOutput->columnData, i);
       continue;
     }
+
     char *input = colDataGetData(pInput[0].columnData, i);
 
     switch(outputType) {
       case TSDB_DATA_TYPE_BIGINT: {
         if (inputType == TSDB_DATA_TYPE_BINARY) {
-          memcpy(output, varDataVal(input), varDataLen(input));
-          *(int64_t *)output = taosStr2Int64(output, NULL, 10);
+          *(int64_t *)output = taosStr2Int64(varDataVal(input), NULL, 10);
         } else if (inputType == TSDB_DATA_TYPE_NCHAR) {
-          char *newBuf = taosMemoryCalloc(1, outputLen * TSDB_NCHAR_SIZE + 1);
+          char *newBuf = taosMemoryCalloc(1, inputLen);
           int32_t len  = taosUcs4ToMbs((TdUcs4 *)varDataVal(input), varDataLen(input), newBuf);
           if (len < 0) {
             taosMemoryFree(newBuf);
@@ -742,10 +743,9 @@ int32_t castFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutp
       }
       case TSDB_DATA_TYPE_UBIGINT: {
         if (inputType == TSDB_DATA_TYPE_BINARY) {
-          memcpy(output, varDataVal(input), varDataLen(input));
-          *(uint64_t *)output = taosStr2UInt64(output, NULL, 10);
+          *(uint64_t *)output = taosStr2UInt64(varDataVal(input), NULL, 10);
         } else if (inputType == TSDB_DATA_TYPE_NCHAR) {
-          char *newBuf = taosMemoryCalloc(1, outputLen * TSDB_NCHAR_SIZE + 1);
+          char *newBuf = taosMemoryCalloc(1, inputLen);
           int32_t len = taosUcs4ToMbs((TdUcs4 *)varDataVal(input), varDataLen(input), newBuf);
           if (len < 0) {
             taosMemoryFree(newBuf);