diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 3c3d3e953dc567f7f9edb83d56d6ff48dca9edf6..5594ee9bcf1cffb1edb7e96c734bc8d877188d46 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -263,6 +263,7 @@ int32_t colDataMergeCol(SColumnInfoData* pColumnInfoData, uint32_t numOfRow1, in
     pColumnInfoData->varmeta.length = len + oldLen;
   } else {
     if (finalNumOfRows > *capacity) {
+      ASSERT(finalNumOfRows*pColumnInfoData->info.bytes);
       char* tmp = taosMemoryRealloc(pColumnInfoData->pData, finalNumOfRows * pColumnInfoData->info.bytes);
       if (tmp == NULL) {
         return TSDB_CODE_VND_OUT_OF_MEMORY;
@@ -1126,6 +1127,7 @@ void blockDataCleanup(SSDataBlock* pDataBlock) {
 }
 
 int32_t colInfoDataEnsureCapacity(SColumnInfoData* pColumn, size_t existRows, uint32_t numOfRows) {
+  ASSERT(numOfRows);
   if (0 == numOfRows || numOfRows <= existRows) {
     return TSDB_CODE_SUCCESS;
   }
@@ -1178,6 +1180,8 @@ void colInfoDataCleanup(SColumnInfoData* pColumn, uint32_t numOfRows) {
 
 int32_t blockDataEnsureCapacity(SSDataBlock* pDataBlock, uint32_t numOfRows) {
   int32_t code = 0;
+  ASSERT(numOfRows > 0);
+
   if (numOfRows == 0) {
     return TSDB_CODE_SUCCESS;
   }
diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index 2a0f34cd03e02ac13b570907ab26f0f946557133..5761c0be78189d96cc30d59063b6a6600c9b5923 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -234,6 +234,7 @@ typedef struct SColMatchInfo {
   int32_t colId;
   int32_t targetSlotId;
   bool    output;
+  bool    reserved;
   int32_t matchType;     // determinate the source according to col id or slot id
 } SColMatchInfo;
 
@@ -253,7 +254,6 @@ typedef struct STableScanInfo {
 
   SFileBlockLoadRecorder readRecorder;
   int64_t         numOfRows;
-//  int32_t         prevGroupId;  // previous table group id
   SScanInfo       scanInfo;
   int32_t         scanTimes;
   SNode*          pFilterNode;  // filter info, which is push down by optimizer
diff --git a/source/libs/executor/src/executil.c b/source/libs/executor/src/executil.c
index 27096fe7f9cefe3ea4c0ce1f144c127e9f551a7f..566abb14515cd02904183a14aa3b5f34cb6181a8 100644
--- a/source/libs/executor/src/executil.c
+++ b/source/libs/executor/src/executil.c
@@ -300,7 +300,7 @@ SArray* extractColMatchInfo(SNodeList* pNodeList, SDataBlockDescNode* pOutputNod
 
     SColMatchInfo c = {0};
     c.output = true;
-    c.colId = pColNode->colId;
+    c.colId  = pColNode->colId;
     c.srcSlotId = pColNode->slotId;
     c.matchType = type;
     c.targetSlotId = pNode->slotId;
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 94675ce253a3149551548521f596ba79b98a18ed..20dac8522330c469cfa5267ca6ff0381f463fc79 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -609,7 +609,7 @@ int32_t projectApplyFunctions(SExprInfo* pExpr, SSDataBlock* pResult, SSDataBloc
       }
 
       int32_t startOffset = createNewColModel ? 0 : pResult->info.rows;
-      colInfoDataEnsureCapacity(pResColData, startOffset, pResult->info.capacity);
+      ASSERT(pResult->info.capacity > 0);
       colDataMergeCol(pResColData, startOffset, &pResult->info.capacity, &idata, dest.numOfRows);
 
       numOfRows = dest.numOfRows;
@@ -649,7 +649,7 @@ int32_t projectApplyFunctions(SExprInfo* pExpr, SSDataBlock* pResult, SSDataBloc
         }
 
         int32_t startOffset = createNewColModel ? 0 : pResult->info.rows;
-        colInfoDataEnsureCapacity(pResColData, startOffset, pResult->info.capacity);
+        ASSERT(pResult->info.capacity > 0);
         colDataMergeCol(pResColData, startOffset, &pResult->info.capacity, &idata, dest.numOfRows);
 
         numOfRows = dest.numOfRows;
@@ -1340,9 +1340,9 @@ void extractQualifiedTupleByFilterResult(SSDataBlock* pBlock, const int8_t* rowR
   }
 
   if (rowRes != NULL) {
+    int32_t totalRows = pBlock->info.rows;
     SSDataBlock* px = createOneDataBlock(pBlock, true);
 
-    int32_t totalRows = pBlock->info.rows;
     for (int32_t i = 0; i < pBlock->info.numOfCols; ++i) {
       SColumnInfoData* pSrc = taosArrayGet(px->pDataBlock, i);
       SColumnInfoData* pDst = taosArrayGet(pBlock->pDataBlock, i);
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 734c6bfbfbd4ded409e0910a55a26b2cdae674e5..39a62410f9fe02730dc3c38fb3ffb618398b6e59 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -224,7 +224,7 @@ static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableSca
         pBlock->pBlockAgg = taosMemoryCalloc(numOfCols, POINTER_BYTES);
       }
 
-      for (int32_t i = 0; i < numOfCols; ++i) {
+      for (int32_t i = 0; i < taosArrayGetSize(pTableScanInfo->pColMatchInfo); ++i) {
         SColMatchInfo* pColMatchInfo = taosArrayGet(pTableScanInfo->pColMatchInfo, i);
         if (!pColMatchInfo->output) {
           continue;
@@ -384,7 +384,14 @@ static SSDataBlock* doTableScanImpl(SOperatorInfo* pOperator) {
       continue;
     }
 
-    tsdbRetrieveDataBlockInfo(pTableScanInfo->dataReader, &pBlock->info);
+    blockDataCleanup(pBlock);
+
+    SDataBlockInfo binfo = pBlock->info;
+    tsdbRetrieveDataBlockInfo(pTableScanInfo->dataReader, &binfo);
+
+    binfo.capacity = binfo.rows;
+    blockDataEnsureCapacity(pBlock, binfo.rows);
+    pBlock->info = binfo;
 
     uint32_t status = 0;
     int32_t  code = loadDataBlock(pOperator, pTableScanInfo, pBlock, &status);
@@ -530,7 +537,6 @@ SOperatorInfo* createTableScanOperatorInfo(STableScanPhysiNode* pTableScanNode,
   // taosSsleep(20);
 
   SDataBlockDescNode* pDescNode = pTableScanNode->scan.node.pOutputDataBlockDesc;
-
   int32_t numOfCols = 0;
   SArray* pColList = extractColMatchInfo(pTableScanNode->scan.pScanCols, pDescNode, &numOfCols, COL_MATCH_FROM_COL_ID);