diff --git a/include/common/tdatablock.h b/include/common/tdatablock.h
index 84d696e518..99fffa2cf1 100644
--- a/include/common/tdatablock.h
+++ b/include/common/tdatablock.h
@@ -178,7 +178,7 @@ int32_t getJsonValueLen(const char* data);
 
 int32_t colDataSetVal(SColumnInfoData* pColumnInfoData, uint32_t rowIndex, const char* pData, bool isNull);
 int32_t colDataAppend(SColumnInfoData* pColumnInfoData, uint32_t rowIndex, const char* pData, bool isNull);
-int32_t colDataSetNItems(SColumnInfoData* pColumnInfoData, uint32_t rowIndex, const char* pData, uint32_t numOfRows);
+int32_t colDataSetNItems(SColumnInfoData* pColumnInfoData, uint32_t rowIndex, const char* pData, uint32_t numOfRows, bool trimValue);
 int32_t colDataMergeCol(SColumnInfoData* pColumnInfoData, int32_t numOfRow1, int32_t* capacity,
                         const SColumnInfoData* pSource, int32_t numOfRow2);
 int32_t colDataAssign(SColumnInfoData* pColumnInfoData, const SColumnInfoData* pSource, int32_t numOfRows,
diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 3c8d394b43..6e2b650b5b 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -147,9 +147,17 @@ int32_t colDataReserve(SColumnInfoData* pColumnInfoData, size_t newSize) {
   return TSDB_CODE_SUCCESS;
 }
 
-static void doCopyNItems(struct SColumnInfoData* pColumnInfoData, int32_t currentRow, const char* pData,
-                         int32_t itemLen, int32_t numOfRows) {
-  ASSERT(pColumnInfoData->info.bytes >= itemLen);
+static int32_t doCopyNItems(struct SColumnInfoData* pColumnInfoData, int32_t currentRow, const char* pData,
+                         int32_t itemLen, int32_t numOfRows, bool trimValue) {
+  if (pColumnInfoData->info.bytes < itemLen) {
+    uWarn("column/tag actual data len %d is bigger than schema len %d, trim it:%d", itemLen, pColumnInfoData->info.bytes, trimValue);
+    if (trimValue) {
+      itemLen = pColumnInfoData->info.bytes;
+    } else {
+      return TSDB_CODE_TDB_INVALID_TABLE_SCHEMA_VER;
+    }
+  }
+  
   size_t start = 1;
 
   // the first item
@@ -178,10 +186,12 @@ static void doCopyNItems(struct SColumnInfoData* pColumnInfoData, int32_t curren
 
     pColumnInfoData->varmeta.length += numOfRows * itemLen;
   }
+
+  return TSDB_CODE_SUCCESS;
 }
 
 int32_t colDataSetNItems(SColumnInfoData* pColumnInfoData, uint32_t currentRow, const char* pData,
-                            uint32_t numOfRows) {
+                            uint32_t numOfRows, bool trimValue) {
   int32_t len = pColumnInfoData->info.bytes;
   if (IS_VAR_DATA_TYPE(pColumnInfoData->info.type)) {
     len = varDataTLen(pData);
@@ -193,8 +203,7 @@ int32_t colDataSetNItems(SColumnInfoData* pColumnInfoData, uint32_t currentRow,
     }
   }
 
-  doCopyNItems(pColumnInfoData, currentRow, pData, len, numOfRows);
-  return TSDB_CODE_SUCCESS;
+  return doCopyNItems(pColumnInfoData, currentRow, pData, len, numOfRows, trimValue);
 }
 
 static void doBitmapMerge(SColumnInfoData* pColumnInfoData, int32_t numOfRow1, const SColumnInfoData* pSource,
diff --git a/source/dnode/vnode/inc/vnode.h b/source/dnode/vnode/inc/vnode.h
index 2d053d04ae..7864d80a38 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -182,7 +182,7 @@ int32_t tsdbReaderOpen(SVnode *pVnode, SQueryTableDataCond *pCond, void *pTableL
 
 void         tsdbReaderSetId(STsdbReader* pReader, const char* idstr);
 void         tsdbReaderClose(STsdbReader *pReader);
-bool         tsdbNextDataBlock(STsdbReader *pReader);
+int32_t      tsdbNextDataBlock(STsdbReader *pReader, bool *hasNext);
 int32_t      tsdbRetrieveDatablockSMA(STsdbReader *pReader, SSDataBlock *pDataBlock, bool *allHave);
 void         tsdbReleaseDataBlock(STsdbReader *pReader);
 SSDataBlock *tsdbRetrieveDataBlock(STsdbReader *pTsdbReadHandle, SArray *pColumnIdList);
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 89d3239c33..255db3379f 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -949,14 +949,17 @@ static void setBlockAllDumped(SFileBlockDumpInfo* pDumpInfo, int64_t maxKey, int
   pDumpInfo->lastKey = maxKey + step;
 }
 
-static void doCopyColVal(SColumnInfoData* pColInfoData, int32_t rowIndex, int32_t colIndex, SColVal* pColVal,
+static int32_t doCopyColVal(SColumnInfoData* pColInfoData, int32_t rowIndex, int32_t colIndex, SColVal* pColVal,
                          SBlockLoadSuppInfo* pSup) {
   if (IS_VAR_DATA_TYPE(pColVal->type)) {
     if (!COL_VAL_IS_VALUE(pColVal)) {
       colDataSetNULL(pColInfoData, rowIndex);
     } else {
       varDataSetLen(pSup->buildBuf[colIndex], pColVal->value.nData);
-      ASSERT(pColVal->value.nData <= pColInfoData->info.bytes);
+      if (pColVal->value.nData > pColInfoData->info.bytes) {
+        tsdbWarn("column cid:%d actual data len %d is bigger than schema len %d", pColVal->cid, pColVal->value.nData, pColInfoData->info.bytes);
+        return TSDB_CODE_TDB_INVALID_TABLE_SCHEMA_VER;
+      }
       if (pColVal->value.nData > 0) {  // pData may be null, if nData is 0
         memcpy(varDataVal(pSup->buildBuf[colIndex]), pColVal->value.pData, pColVal->value.nData);
       }
@@ -966,6 +969,8 @@ static void doCopyColVal(SColumnInfoData* pColInfoData, int32_t rowIndex, int32_
   } else {
     colDataSetVal(pColInfoData, rowIndex, (const char*)&pColVal->value, !COL_VAL_IS_VALUE(pColVal));
   }
+
+  return TSDB_CODE_SUCCESS;
 }
 
 static SFileDataBlockInfo* getCurrentBlockInfo(SDataBlockIter* pBlockIter) {
@@ -1167,6 +1172,7 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader) {
   SDataBlk*           pBlock = getCurrentBlock(pBlockIter);
   SSDataBlock*        pResBlock = pReader->pResBlock;
   int32_t             numOfOutputCols = pSupInfo->numOfCols;
+  int32_t             code = TSDB_CODE_SUCCESS;
 
   SColVal cv = {0};
   int64_t st = taosGetTimestampUs();
@@ -1244,7 +1250,10 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader) {
         } else {  // varchar/nchar type
           for (int32_t j = pDumpInfo->rowIndex; rowIndex < dumpedRows; j += step) {
             tColDataGetValue(pData, j, &cv);
-            doCopyColVal(pColData, rowIndex++, i, &cv, pSupInfo);
+            code = doCopyColVal(pColData, rowIndex++, i, &cv, pSupInfo);
+            if (code) {
+              return code;
+            }
           }
         }
       }
@@ -1776,23 +1785,29 @@ static int32_t buildDataBlockFromBuf(STsdbReader* pReader, STableBlockScanInfo*
 }
 
 static bool tryCopyDistinctRowFromFileBlock(STsdbReader* pReader, SBlockData* pBlockData, int64_t key,
-                                            SFileBlockDumpInfo* pDumpInfo) {
+                                            SFileBlockDumpInfo* pDumpInfo, bool *copied) {
   // opt version
   // 1. it is not a border point
   // 2. the direct next point is not an duplicated timestamp
+  int32_t code = TSDB_CODE_SUCCESS;
+
+  *copied = false;
   bool asc = (pReader->order == TSDB_ORDER_ASC);
   if ((pDumpInfo->rowIndex < pDumpInfo->totalRows - 1 && asc) || (pDumpInfo->rowIndex > 0 && (!asc))) {
     int32_t step = pReader->order == TSDB_ORDER_ASC ? 1 : -1;
 
     int64_t nextKey = pBlockData->aTSKEY[pDumpInfo->rowIndex + step];
     if (nextKey != key) {  // merge is not needed
-      doAppendRowFromFileBlock(pReader->pResBlock, pReader, pBlockData, pDumpInfo->rowIndex);
+      code = doAppendRowFromFileBlock(pReader->pResBlock, pReader, pBlockData, pDumpInfo->rowIndex);
+      if (code) {
+        return code;
+      }
       pDumpInfo->rowIndex += step;
-      return true;
+      *copied = true;
     }
   }
 
-  return false;
+  return code;
 }
 
 static bool nextRowFromLastBlocks(SLastBlockReader* pLastBlockReader, STableBlockScanInfo* pScanInfo,
@@ -1819,20 +1834,34 @@ static bool nextRowFromLastBlocks(SLastBlockReader* pLastBlockReader, STableBloc
 }
 
 static bool tryCopyDistinctRowFromSttBlock(TSDBROW* fRow, SLastBlockReader* pLastBlockReader,
-                                           STableBlockScanInfo* pScanInfo, int64_t ts, STsdbReader* pReader) {
+                                           STableBlockScanInfo* pScanInfo, int64_t ts, STsdbReader* pReader, bool *copied) {
+  int32_t code = TSDB_CODE_SUCCESS;
+
+  *copied = false;
+
   bool hasVal = nextRowFromLastBlocks(pLastBlockReader, pScanInfo, &pReader->verRange);
   if (hasVal) {
     int64_t next1 = getCurrentKeyInLastBlock(pLastBlockReader);
     if (next1 != ts) {
-      doAppendRowFromFileBlock(pReader->pResBlock, pReader, fRow->pBlockData, fRow->iRow);
-      return true;
+      code = doAppendRowFromFileBlock(pReader->pResBlock, pReader, fRow->pBlockData, fRow->iRow);
+      if (code) {
+        return code;
+      }
+      
+      *copied = true;
+      return code;
     }
   } else {
-    doAppendRowFromFileBlock(pReader->pResBlock, pReader, fRow->pBlockData, fRow->iRow);
-    return true;
+    code = doAppendRowFromFileBlock(pReader->pResBlock, pReader, fRow->pBlockData, fRow->iRow);
+    if (code) {
+      return code;
+    }
+      
+    *copied = true;
+    return code;
   }
 
-  return false;
+  return code;
 }
 
 static FORCE_INLINE STSchema* getLatestTableSchema(STsdbReader* pReader, uint64_t uid) {
@@ -2022,11 +2051,12 @@ static int32_t doMergeBufAndFileRows(STsdbReader* pReader, STableBlockScanInfo*
     return code;
   }
 
-  doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
+  code = doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
 
   taosMemoryFree(pTSRow);
   tsdbRowMergerClear(&merge);
-  return TSDB_CODE_SUCCESS;
+
+  return code;
 }
 
 static int32_t doMergeFileBlockAndLastBlock(SLastBlockReader* pLastBlockReader, STsdbReader* pReader,
@@ -2034,7 +2064,8 @@ static int32_t doMergeFileBlockAndLastBlock(SLastBlockReader* pLastBlockReader,
                                             bool mergeBlockData) {
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
   int64_t             tsLastBlock = getCurrentKeyInLastBlock(pLastBlockReader);
-
+  bool       copied = false;
+  int32_t    code = TSDB_CODE_SUCCESS;
   SRow*      pTSRow = NULL;
   SRowMerger merge = {0};
   TSDBROW    fRow = tMergeTreeGetRow(&pLastBlockReader->mergeTree);
@@ -2042,7 +2073,12 @@ static int32_t doMergeFileBlockAndLastBlock(SLastBlockReader* pLastBlockReader,
 
   // only last block exists
   if ((!mergeBlockData) || (tsLastBlock != pBlockData->aTSKEY[pDumpInfo->rowIndex])) {
-    if (tryCopyDistinctRowFromSttBlock(&fRow, pLastBlockReader, pBlockScanInfo, tsLastBlock, pReader)) {
+    code = tryCopyDistinctRowFromSttBlock(&fRow, pLastBlockReader, pBlockScanInfo, tsLastBlock, pReader, &copied);
+    if (code) {
+      return code;
+    }
+    
+    if (copied) {
       pBlockScanInfo->lastKey = tsLastBlock;
       return TSDB_CODE_SUCCESS;
     } else {
@@ -2060,10 +2096,15 @@ static int32_t doMergeFileBlockAndLastBlock(SLastBlockReader* pLastBlockReader,
         return code;
       }
 
-      doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
+      code = doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
 
       taosMemoryFree(pTSRow);
       tsdbRowMergerClear(&merge);
+
+      if (code != TSDB_CODE_SUCCESS) {
+        return code;
+      }
+
     }
   } else {  // not merge block data
     int32_t code = tsdbRowMergerInit(&merge, &fRow, pReader->pSchema);
@@ -2083,10 +2124,14 @@ static int32_t doMergeFileBlockAndLastBlock(SLastBlockReader* pLastBlockReader,
       return code;
     }
 
-    doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
+    code = doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
 
     taosMemoryFree(pTSRow);
     tsdbRowMergerClear(&merge);
+
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
   }
 
   return TSDB_CODE_SUCCESS;
@@ -2131,7 +2176,7 @@ static int32_t mergeFileBlockAndLastBlock(STsdbReader* pReader, SLastBlockReader
           return code;
         }
 
-        doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
+        code = doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
 
         taosMemoryFree(pTSRow);
         tsdbRowMergerClear(&merge);
@@ -2353,7 +2398,7 @@ static int32_t doMergeMultiLevelRows(STsdbReader* pReader, STableBlockScanInfo*
     return code;
   }
 
-  doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
+  code = doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
 
   taosMemoryFree(pTSRow);
   tsdbRowMergerClear(&merge);
@@ -2508,7 +2553,13 @@ bool hasDataInFileBlock(const SBlockData* pBlockData, const SFileBlockDumpInfo*
 int32_t mergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pBlockScanInfo, int64_t key,
                               STsdbReader* pReader) {
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
-  if (tryCopyDistinctRowFromFileBlock(pReader, pBlockData, key, pDumpInfo)) {
+  bool copied = false;
+  int32_t code = tryCopyDistinctRowFromFileBlock(pReader, pBlockData, key, pDumpInfo, &copied);
+  if (code) {
+    return code;
+  }
+  
+  if (copied) {
     pBlockScanInfo->lastKey = key;
     return TSDB_CODE_SUCCESS;
   } else {
@@ -2528,11 +2579,11 @@ int32_t mergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pBloc
       return code;
     }
 
-    doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
+    code = doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
 
     taosMemoryFree(pTSRow);
     tsdbRowMergerClear(&merge);
-    return TSDB_CODE_SUCCESS;
+    return code;
   }
 }
 
@@ -2649,7 +2700,10 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
     if (isCleanFileDataBlock(pReader, pBlockInfo, pBlock, pBlockScanInfo, keyInBuf, pLastBlockReader) &&
         pBlock->nRow <= pReader->capacity) {
       if (asc || ((!asc) && (!hasDataInLastBlock(pLastBlockReader)))) {
-        copyBlockDataToSDataBlock(pReader);
+        code = copyBlockDataToSDataBlock(pReader);
+        if (code) {
+          goto _end;
+        }
 
         // record the last key value
         pBlockScanInfo->lastKey = asc ? pBlock->maxKey.ts : pBlock->minKey.ts;
@@ -2696,8 +2750,11 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
       break;
     }
 
-    buildComposedDataBlockImpl(pReader, pBlockScanInfo, pBlockData, pLastBlockReader);
-
+    code = buildComposedDataBlockImpl(pReader, pBlockScanInfo, pBlockData, pLastBlockReader);
+    if (code) {
+      goto _end;
+    }
+    
     // currently loaded file data block is consumed
     if ((pBlockData->nRow > 0) && (pDumpInfo->rowIndex >= pBlockData->nRow || pDumpInfo->rowIndex < 0)) {
       SDataBlk* pBlock = getCurrentBlock(&pReader->status.blockIter);
@@ -2922,6 +2979,7 @@ static int32_t doLoadLastBlockSequentially(STsdbReader* pReader) {
   SReaderStatus*    pStatus = &pReader->status;
   SLastBlockReader* pLastBlockReader = pStatus->fileIter.pLastBlockReader;
   STableUidList*    pUidList = &pStatus->uidList;
+  int32_t           code = TSDB_CODE_SUCCESS;
 
   if (taosHashGetSize(pStatus->pTableMap) == 0) {
     return TSDB_CODE_SUCCESS;
@@ -2952,7 +3010,11 @@ static int32_t doLoadLastBlockSequentially(STsdbReader* pReader) {
         break;
       }
 
-      buildComposedDataBlockImpl(pReader, pScanInfo, &pReader->status.fileBlockData, pLastBlockReader);
+      code = buildComposedDataBlockImpl(pReader, pScanInfo, &pReader->status.fileBlockData, pLastBlockReader);
+      if (code) {
+        return code;
+      }
+      
       if (pResBlock->info.rows >= pReader->capacity) {
         break;
       }
@@ -3032,7 +3094,11 @@ static int32_t doBuildDataBlock(STsdbReader* pReader) {
           break;
         }
 
-        buildComposedDataBlockImpl(pReader, pScanInfo, &pReader->status.fileBlockData, pLastBlockReader);
+        code = buildComposedDataBlockImpl(pReader, pScanInfo, &pReader->status.fileBlockData, pLastBlockReader);
+        if (code) {
+          return code;
+        }
+        
         if (pResBlock->info.rows >= pReader->capacity) {
           break;
         }
@@ -3784,6 +3850,7 @@ int32_t tsdbGetNextRowInMem(STableBlockScanInfo* pBlockScanInfo, STsdbReader* pR
 int32_t doAppendRowFromTSRow(SSDataBlock* pBlock, STsdbReader* pReader, SRow* pTSRow, STableBlockScanInfo* pScanInfo) {
   int32_t outputRowIndex = pBlock->info.rows;
   int64_t uid = pScanInfo->uid;
+  int32_t code =  TSDB_CODE_SUCCESS;
 
   int32_t numOfCols = (int32_t)taosArrayGetSize(pBlock->pDataBlock);
 
@@ -3806,7 +3873,10 @@ int32_t doAppendRowFromTSRow(SSDataBlock* pBlock, STsdbReader* pReader, SRow* pT
       SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, pSupInfo->slotId[i]);
 
       tRowGet(pTSRow, pSchema, j, &colVal);
-      doCopyColVal(pColInfoData, outputRowIndex, i, &colVal, pSupInfo);
+      code = doCopyColVal(pColInfoData, outputRowIndex, i, &colVal, pSupInfo);
+      if (code) {
+        return code;
+      }
       i += 1;
       j += 1;
     } else if (colId < pSchema->columns[j].colId) {
@@ -3836,6 +3906,7 @@ int32_t doAppendRowFromFileBlock(SSDataBlock* pResBlock, STsdbReader* pReader, S
                                  int32_t rowIndex) {
   int32_t i = 0, j = 0;
   int32_t outputRowIndex = pResBlock->info.rows;
+  int32_t code = TSDB_CODE_SUCCESS;
 
   SBlockLoadSuppInfo* pSupInfo = &pReader->suppInfo;
   if (pReader->suppInfo.colId[i] == PRIMARYKEY_TIMESTAMP_COL_ID) {
@@ -3858,7 +3929,10 @@ int32_t doAppendRowFromFileBlock(SSDataBlock* pResBlock, STsdbReader* pReader, S
     SColumnInfoData* pCol = TARRAY_GET_ELEM(pResBlock->pDataBlock, pSupInfo->slotId[i]);
     if (pData->cid == pSupInfo->colId[i]) {
       tColDataGetValue(pData, rowIndex, &cv);
-      doCopyColVal(pCol, outputRowIndex, i, &cv, pSupInfo);
+      code = doCopyColVal(pCol, outputRowIndex, i, &cv, pSupInfo);
+      if (code) {
+        return code;
+      }
       j += 1;
     } else if (pData->cid > pCol->info.colId) {
       // the specified column does not exist in file block, fill with null data
@@ -3882,6 +3956,7 @@ int32_t doAppendRowFromFileBlock(SSDataBlock* pResBlock, STsdbReader* pReader, S
 int32_t buildDataBlockFromBufImpl(STableBlockScanInfo* pBlockScanInfo, int64_t endKey, int32_t capacity,
                                   STsdbReader* pReader) {
   SSDataBlock* pBlock = pReader->pResBlock;
+  int32_t code = TSDB_CODE_SUCCESS;
 
   do {
     //    SRow* pTSRow = NULL;
@@ -3893,13 +3968,20 @@ int32_t buildDataBlockFromBufImpl(STableBlockScanInfo* pBlockScanInfo, int64_t e
     }
 
     if (row.type == TSDBROW_ROW_FMT) {
-      doAppendRowFromTSRow(pBlock, pReader, row.pTSRow, pBlockScanInfo);
+      code = doAppendRowFromTSRow(pBlock, pReader, row.pTSRow, pBlockScanInfo);
 
       if (freeTSRow) {
         taosMemoryFree(row.pTSRow);
       }
+
+      if (code) {
+        return code;
+      }
     } else {
-      doAppendRowFromFileBlock(pBlock, pReader, row.pBlockData, row.iRow);
+      code = doAppendRowFromFileBlock(pBlock, pReader, row.pBlockData, row.iRow);
+      if (code) {
+        break;
+      }
     }
 
     // no data in buffer, return immediately
@@ -3912,7 +3994,7 @@ int32_t buildDataBlockFromBufImpl(STableBlockScanInfo* pBlockScanInfo, int64_t e
     }
   } while (1);
 
-  return TSDB_CODE_SUCCESS;
+  return code;
 }
 
 // TODO refactor: with createDataBlockScanInfo
@@ -4399,43 +4481,51 @@ _err:
   return code;
 }
 
-static bool doTsdbNextDataBlock(STsdbReader* pReader) {
+static int32_t doTsdbNextDataBlock(STsdbReader* pReader, bool *hasNext) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  
   // cleanup the data that belongs to the previous data block
   SSDataBlock* pBlock = pReader->pResBlock;
   blockDataCleanup(pBlock);
 
+  *hasNext = false;
+
   SReaderStatus* pStatus = &pReader->status;
   if (taosHashGetSize(pStatus->pTableMap) == 0) {
-    return false;
+    return code;
   }
 
   if (pStatus->loadFromFile) {
-    int32_t code = buildBlockFromFiles(pReader);
+    code = buildBlockFromFiles(pReader);
     if (code != TSDB_CODE_SUCCESS) {
-      return false;
+      return code;
     }
 
-    if (pBlock->info.rows > 0) {
-      return true;
-    } else {
+    if (pBlock->info.rows <= 0) {
       resetTableListIndex(&pReader->status);
-      buildBlockFromBufferSequentially(pReader);
-      return pBlock->info.rows > 0;
+      code = buildBlockFromBufferSequentially(pReader);
     }
   } else {  // no data in files, let's try the buffer
-    buildBlockFromBufferSequentially(pReader);
-    return pBlock->info.rows > 0;
+    code = buildBlockFromBufferSequentially(pReader);
   }
+
+  *hasNext = pBlock->info.rows > 0;
+
+  return code;
 }
 
-bool tsdbNextDataBlock(STsdbReader* pReader) {
+int32_t tsdbNextDataBlock(STsdbReader* pReader, bool *hasNext) {
+  int32_t code = TSDB_CODE_SUCCESS;
+
+  *hasNext = false;
+  
   if (isEmptyQueryTimeWindow(&pReader->window) || pReader->step == EXTERNAL_ROWS_NEXT) {
-    return false;
+    return code;
   }
 
   SReaderStatus* pStatus = &pReader->status;
 
-  int32_t code = tsdbAcquireReader(pReader);
+  code = tsdbAcquireReader(pReader);
   qTrace("tsdb/read: %p, take read mutex, code: %d", pReader, code);
 
   if (pReader->suspended) {
@@ -4443,16 +4533,21 @@ bool tsdbNextDataBlock(STsdbReader* pReader) {
   }
 
   if (pReader->innerReader[0] != NULL && pReader->step == 0) {
-    bool ret = doTsdbNextDataBlock(pReader->innerReader[0]);
+    code = doTsdbNextDataBlock(pReader->innerReader[0], hasNext);
+    if (code) {
+      tsdbReleaseReader(pReader);
+      return code;
+    }
+    
     pReader->step = EXTERNAL_ROWS_PREV;
-    if (ret) {
+    if (*hasNext) {
       pStatus = &pReader->innerReader[0]->status;
       if (pStatus->composedDataBlock) {
         qTrace("tsdb/read: %p, unlock read mutex", pReader);
         tsdbReleaseReader(pReader);
       }
 
-      return ret;
+      return code;
     }
   }
 
@@ -4469,14 +4564,19 @@ bool tsdbNextDataBlock(STsdbReader* pReader) {
     pReader->step = EXTERNAL_ROWS_MAIN;
   }
 
-  bool ret = doTsdbNextDataBlock(pReader);
-  if (ret) {
+  code = doTsdbNextDataBlock(pReader, hasNext);
+  if (code != TSDB_CODE_SUCCESS) {
+    tsdbReleaseReader(pReader);
+    return code;
+  }
+  
+  if (*hasNext) {
     if (pStatus->composedDataBlock) {
       qTrace("tsdb/read: %p, unlock read mutex", pReader);
       tsdbReleaseReader(pReader);
     }
 
-    return ret;
+    return code;
   }
 
   if (pReader->step == EXTERNAL_ROWS_MAIN && pReader->innerReader[1] != NULL) {
@@ -4488,23 +4588,28 @@ bool tsdbNextDataBlock(STsdbReader* pReader) {
       return code;
     }
 
-    ret = doTsdbNextDataBlock(pReader->innerReader[1]);
+    code = doTsdbNextDataBlock(pReader->innerReader[1], hasNext);
+    if (code != TSDB_CODE_SUCCESS) {
+      tsdbReleaseReader(pReader);
+      return code;
+    }
+    
     pReader->step = EXTERNAL_ROWS_NEXT;
-    if (ret) {
+    if (*hasNext) {
       pStatus = &pReader->innerReader[1]->status;
       if (pStatus->composedDataBlock) {
         qTrace("tsdb/read: %p, unlock read mutex", pReader);
         tsdbReleaseReader(pReader);
       }
 
-      return ret;
+      return code;
     }
   }
 
   qTrace("tsdb/read: %p, unlock read mutex", pReader);
   tsdbReleaseReader(pReader);
 
-  return false;
+  return code;
 }
 
 static void doFillNullColSMA(SBlockLoadSuppInfo* pSup, int32_t numOfRows, int32_t numOfCols, SColumnDataAgg* pTsAgg) {
@@ -4649,20 +4754,27 @@ STableBlockScanInfo* getTableBlockScanInfo(SHashObj* pTableMap, uint64_t uid, co
 
 static SSDataBlock* doRetrieveDataBlock(STsdbReader* pReader) {
   SReaderStatus*       pStatus = &pReader->status;
+  int32_t              code = TSDB_CODE_SUCCESS;
   SFileDataBlockInfo*  pBlockInfo = getCurrentBlockInfo(&pStatus->blockIter);
   STableBlockScanInfo* pBlockScanInfo = getTableBlockScanInfo(pStatus->pTableMap, pBlockInfo->uid, pReader->idStr);
   if (pBlockScanInfo == NULL) {
     return NULL;
   }
 
-  int32_t code = doLoadFileBlockData(pReader, &pStatus->blockIter, &pStatus->fileBlockData, pBlockScanInfo->uid);
+  code = doLoadFileBlockData(pReader, &pStatus->blockIter, &pStatus->fileBlockData, pBlockScanInfo->uid);
+  if (code != TSDB_CODE_SUCCESS) {
+    tBlockDataDestroy(&pStatus->fileBlockData);
+    terrno = code;
+    return NULL;
+  }
+
+  code = copyBlockDataToSDataBlock(pReader);
   if (code != TSDB_CODE_SUCCESS) {
     tBlockDataDestroy(&pStatus->fileBlockData);
     terrno = code;
     return NULL;
   }
 
-  copyBlockDataToSDataBlock(pReader);
   return pReader->pResBlock;
 }
 
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 5dff1abb97..870c96811b 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -584,10 +584,16 @@ int32_t addTagPseudoColumnData(SReadHandle* pHandle, const SExprInfo* pExpr, int
       if (isNullVal) {
         colDataSetNNULL(pColInfoData, 0, pBlock->info.rows);
       } else if (pColInfoData->info.type != TSDB_DATA_TYPE_JSON) {
-        colDataSetNItems(pColInfoData, 0, data, pBlock->info.rows);
+        code = colDataSetNItems(pColInfoData, 0, data, pBlock->info.rows, false);
         if (IS_VAR_DATA_TYPE(((const STagVal*)p)->type)) {
           taosMemoryFree(data);
         }
+        if (code) {
+          if (freeReader) {
+            metaReaderClear(&mr);
+          }
+          return code;
+        }
       } else {  // todo opt for json tag
         for (int32_t i = 0; i < pBlock->info.rows; ++i) {
           colDataSetVal(pColInfoData, i, data, false);
@@ -634,10 +640,22 @@ static SSDataBlock* doTableScanImpl(SOperatorInfo* pOperator) {
   STableScanInfo* pTableScanInfo = pOperator->info;
   SExecTaskInfo*  pTaskInfo = pOperator->pTaskInfo;
   SSDataBlock*    pBlock = pTableScanInfo->pResBlock;
+  bool            hasNext = false;
+  int32_t         code = TSDB_CODE_SUCCESS;
 
   int64_t st = taosGetTimestampUs();
 
-  while (tsdbNextDataBlock(pTableScanInfo->base.dataReader)) {
+  while (true) {
+    code = tsdbNextDataBlock(pTableScanInfo->base.dataReader, &hasNext);
+    if (code) {
+      tsdbReleaseDataBlock(pTableScanInfo->base.dataReader);
+      T_LONG_JMP(pTaskInfo->env, code);
+    }
+
+    if (!hasNext) {
+      break;
+    }
+    
     if (isTaskKilled(pTaskInfo)) {
       tsdbReleaseDataBlock(pTableScanInfo->base.dataReader);
       T_LONG_JMP(pTaskInfo->env, pTaskInfo->code);
@@ -1015,7 +1033,15 @@ static SSDataBlock* readPreVersionData(SOperatorInfo* pTableScanOp, uint64_t tbU
     return NULL;
   }
 
-  if (tsdbNextDataBlock(pReader)) {
+  bool hasNext = false;
+  code = tsdbNextDataBlock(pReader, &hasNext);
+  if (code != TSDB_CODE_SUCCESS) {
+    terrno = code;
+    T_LONG_JMP(pTaskInfo->env, code);
+    return NULL;
+  }
+
+  if (hasNext) {
     /*SSDataBlock* p = */ tsdbRetrieveDataBlock(pReader, NULL);
     doSetTagColumnData(&pTableScanInfo->base, pBlock, pTaskInfo, pBlock->info.rows);
     pBlock->info.id.groupId = getTableGroupId(pTaskInfo->pTableInfoList, pBlock->info.id.uid);
@@ -2104,12 +2130,22 @@ static SSDataBlock* doRawScan(SOperatorInfo* pOperator) {
   // NOTE: this operator does never check if current status is done or not
   SExecTaskInfo*      pTaskInfo = pOperator->pTaskInfo;
   SStreamRawScanInfo* pInfo = pOperator->info;
+  int32_t             code = TSDB_CODE_SUCCESS;
   pTaskInfo->streamInfo.metaRsp.metaRspLen = 0;  // use metaRspLen !=0 to judge if data is meta
   pTaskInfo->streamInfo.metaRsp.metaRsp = NULL;
 
   qDebug("tmqsnap doRawScan called");
   if (pTaskInfo->streamInfo.prepareStatus.type == TMQ_OFFSET__SNAPSHOT_DATA) {
-    if (pInfo->dataReader && tsdbNextDataBlock(pInfo->dataReader)) {
+    bool hasNext = false;
+    if (pInfo->dataReader) {
+      code = tsdbNextDataBlock(pInfo->dataReader, &hasNext);
+      if (code) {
+        tsdbReleaseDataBlock(pInfo->dataReader);
+        longjmp(pTaskInfo->env, code);
+      }
+    }
+    
+    if (pInfo->dataReader && hasNext) {
       if (isTaskKilled(pTaskInfo)) {
         tsdbReleaseDataBlock(pInfo->dataReader);
         longjmp(pTaskInfo->env, pTaskInfo->code);
@@ -2610,8 +2646,21 @@ static SSDataBlock* getTableDataBlockImpl(void* param) {
   
   pInfo->base.dataReader = source->dataReader;
   STsdbReader* reader = pInfo->base.dataReader;
+  bool hasNext = false;
   qTrace("tsdb/read-table-data: %p, enter next reader", reader);
-  while (tsdbNextDataBlock(reader)) {
+
+  while (true) {
+    code = tsdbNextDataBlock(reader, &hasNext);
+    if (code != 0) {
+      tsdbReleaseDataBlock(reader);
+      pInfo->base.dataReader = NULL;
+      T_LONG_JMP(pTaskInfo->env, code);
+    }
+
+    if (!hasNext) {
+      break;
+    }
+  
     if (isTaskKilled(pTaskInfo)) {
       tsdbReleaseDataBlock(reader);
       pInfo->base.dataReader = NULL;
diff --git a/source/libs/executor/src/sysscanoperator.c b/source/libs/executor/src/sysscanoperator.c
index f24d3523c8..00a90cc108 100644
--- a/source/libs/executor/src/sysscanoperator.c
+++ b/source/libs/executor/src/sysscanoperator.c
@@ -1627,7 +1627,7 @@ static void sysTableScanFillTbName(SOperatorInfo* pOperator, const SSysTableScan
     char             varTbName[TSDB_TABLE_FNAME_LEN - 1 + VARSTR_HEADER_SIZE] = {0};
     STR_TO_VARSTR(varTbName, name);
 
-    colDataSetNItems(pColumnInfoData, 0, varTbName, pBlock->info.rows);
+    colDataSetNItems(pColumnInfoData, 0, varTbName, pBlock->info.rows, true);
   }
 
   doFilter(pBlock, pOperator->exprSupp.pFilterInfo, NULL);
diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 195a08525c..1affbac613 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -1755,7 +1755,11 @@ int32_t winEndTsFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *p
 int32_t qTbnameFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   char* p = colDataGetVarData(pInput->columnData, 0);
 
-  colDataSetNItems(pOutput->columnData, pOutput->numOfRows, p, pInput->numOfRows);
+  int32_t code = colDataSetNItems(pOutput->columnData, pOutput->numOfRows, p, pInput->numOfRows, true);
+  if (code) {
+    return code;
+  }
+  
   pOutput->numOfRows += pInput->numOfRows;
   return TSDB_CODE_SUCCESS;
 }
diff --git a/tests/parallel_test/cases.task b/tests/parallel_test/cases.task
index 4d6b5ff05e..260d47032a 100644
--- a/tests/parallel_test/cases.task
+++ b/tests/parallel_test/cases.task
@@ -14,6 +14,8 @@
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery_math.py -Q 2
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery_time.py -Q 2
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery.py -Q 2
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/columnLenUpdated.py -Q 2
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/columnLenUpdated.py -Q 3
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery.py -Q 3
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery_str.py -Q 3
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery_math.py -Q 3
@@ -22,6 +24,7 @@
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery_str.py -Q 4
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery_math.py -Q 4
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/nestedQuery_time.py -Q 4
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/columnLenUpdated.py -Q 4
 ,,y,system-test,./pytest.sh python3 ./test.py -f 7-tmq/tmqShow.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 7-tmq/tmqDropStb.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 7-tmq/subscribeStb0.py
diff --git a/tests/system-test/2-query/columnLenUpdated.py b/tests/system-test/2-query/columnLenUpdated.py
new file mode 100644
index 0000000000..d6940fde8b
--- /dev/null
+++ b/tests/system-test/2-query/columnLenUpdated.py
@@ -0,0 +1,181 @@
+
+import taos
+import sys
+import time
+import socket
+import os
+import platform
+if platform.system().lower() == 'windows':
+    import wexpect as taosExpect
+else:
+    import pexpect as taosExpect
+
+from util.log import *
+from util.sql import *
+from util.cases import *
+from util.dnodes import *
+
+def taos_command (buildPath, key, value, expectString, sqlString=''):
+    if len(key) == 0:
+        tdLog.exit("taos test key is null!")
+
+    if platform.system().lower() == 'windows':
+        taosCmd = buildPath + '\\build\\bin\\taos.exe '
+        taosCmd = taosCmd.replace('\\','\\\\')
+    else:
+        taosCmd = buildPath + '/build/bin/taos '
+
+    cfgPath = buildPath + "/../sim/psim/cfg"
+    taosCmd = taosCmd + ' -c' + cfgPath + ' -' + key
+    if len(value) != 0:
+        taosCmd = taosCmd + ' ' + value
+
+    tdLog.info ("taos cmd: %s" % taosCmd)
+
+    child = taosExpect.spawn(taosCmd, timeout=20)
+    #output = child.readline()
+    #print (output.decode())
+    if len(expectString) != 0:
+        i = child.expect([expectString, taosExpect.TIMEOUT, taosExpect.EOF], timeout=20)
+    else:
+        i = child.expect([taosExpect.TIMEOUT, taosExpect.EOF], timeout=20)
+
+    if platform.system().lower() == 'windows':
+        retResult = child.before
+    else:
+        retResult = child.before.decode()
+    print(retResult)
+    #print(child.after.decode())
+    if i == 0:
+        print ('taos login success! Here can run sql, taos> ')
+        return  "TAOS_OK"
+    else:
+        return "TAOS_FAIL"
+
+class TDTestCase:
+    #updatecfgDict = {'clientCfg': {'serverPort': 7080, 'firstEp': 'trd02:7080', 'secondEp':'trd02:7080'},\
+    #                 'serverPort': 7080, 'firstEp': 'trd02:7080'}
+    hostname = socket.gethostname()
+    if (platform.system().lower() == 'windows' and not tdDnodes.dnodes[0].remoteIP == ""):
+        try:
+            config = eval(tdDnodes.dnodes[0].remoteIP)
+            hostname = config["host"]
+        except Exception:
+            hostname = tdDnodes.dnodes[0].remoteIP
+    serverPort = '7080'
+    rpcDebugFlagVal = '143'
+    clientCfgDict = {'serverPort': '', 'firstEp': '', 'secondEp':'', 'rpcDebugFlag':'135', 'fqdn':''}
+    clientCfgDict["serverPort"]    = serverPort
+    clientCfgDict["firstEp"]       = hostname + ':' + serverPort
+    clientCfgDict["secondEp"]      = hostname + ':' + serverPort
+    clientCfgDict["rpcDebugFlag"]  = rpcDebugFlagVal
+    clientCfgDict["fqdn"] = hostname
+
+    updatecfgDict = {'clientCfg': {}, 'serverPort': '', 'firstEp': '', 'secondEp':'', 'rpcDebugFlag':'135', 'fqdn':''}
+    updatecfgDict["clientCfg"]  = clientCfgDict
+    updatecfgDict["serverPort"] = serverPort
+    updatecfgDict["firstEp"]    = hostname + ':' + serverPort
+    updatecfgDict["secondEp"]   = hostname + ':' + serverPort
+    updatecfgDict["fqdn"] = hostname
+
+    print ("===================: ", updatecfgDict)
+
+    def init(self, conn, logSql, replicaVar=1):
+        self.replicaVar = int(replicaVar)
+        tdLog.debug(f"start to excute {__file__}")
+        tdSql.init(conn.cursor())
+
+    def getBuildPath(self):
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+
+        for root, dirs, files in os.walk(projPath):
+            if ("taosd" in files or "taosd.exe" in files):
+                rootRealPath = os.path.dirname(os.path.realpath(root))
+                if ("packaging" not in rootRealPath):
+                    buildPath = root[:len(root) - len("/build/bin")]
+                    break
+        return buildPath
+
+    def run(self):  # sourcery skip: extract-duplicate-method, remove-redundant-fstring
+        tdSql.prepare()
+        # time.sleep(2)
+        tdSql.query("create user testpy pass 'testpy'")
+
+        buildPath = self.getBuildPath()
+        if (buildPath == ""):
+            tdLog.exit("taosd not found!")
+        else:
+            tdLog.info("taosd found in %s" % buildPath)
+        cfgPath = buildPath + "/../sim/psim/cfg"
+        tdLog.info("cfgPath: %s" % cfgPath)
+
+        checkNetworkStatus = ['0: unavailable', '1: network ok', '2: service ok', '3: service degraded', '4: exiting']
+        netrole            = ['client', 'server']
+
+        keyDict = {'h':'', 'P':'6030', 'p':'testpy', 'u':'testpy', 'a':'', 'A':'', 'c':'', 'C':'', 's':'', 'r':'', 'f':'', \
+                   'k':'', 't':'', 'n':'', 'l':'1024', 'N':'100', 'V':'', 'd':'db', 'w':'30', '-help':'', '-usage':'', '?':''}
+
+        keyDict['h'] = self.hostname
+        keyDict['c'] = cfgPath
+        keyDict['P'] = self.serverPort
+
+        tdSql.query("drop database if exists db1")
+        tdSql.query("create database if not exists db1 vgroups 1")
+        tdSql.query("use db1")
+        tdSql.query("create table tba (ts timestamp, f1 binary(2))")
+        tdSql.query("insert into tba values (now, '22')")
+        tdSql.query("select * from tba")
+        tdSql.checkData(0, 1, '22')
+
+        keyDict['s'] = "\"alter table db1.tba modify column f1 binary(5) \""
+        retCode = taos_command(buildPath, "s", keyDict['s'], "Query OK", '')
+        if retCode != "TAOS_OK":
+            tdLog.exit("taos -s fail")
+
+        keyDict['s'] = "\"insert into db1.tba values (now, '55555')\""
+        retCode = taos_command(buildPath, "s", keyDict['s'], "Insert OK", '')
+        if retCode != "TAOS_OK":
+            tdLog.exit("taos -s fail")
+
+        tdSql.query("select * from tba order by ts")
+        tdSql.checkData(0, 1, '22')
+        tdSql.checkData(1, 1, '55555')
+
+
+        tdSql.query("create table stb (ts timestamp, f1 int) tags (tg1 binary(2))")
+        tdSql.query("create table tb1 using stb tags('bb')")
+        tdSql.query("insert into tb1 values (now, 2)")
+        tdSql.query("select count(*) from stb group by tg1")
+        tdSql.checkData(0, 0, 1)
+
+        keyDict['s'] = "\"alter table db1.stb modify tag tg1 binary(5) \""
+        retCode = taos_command(buildPath, "s", keyDict['s'], "Query OK", '')
+        if retCode != "TAOS_OK":
+            tdLog.exit("taos -s fail")
+
+        keyDict['s'] = "\"create table db1.tb2 using db1.stb tags('bbbbb')\""
+        retCode = taos_command(buildPath, "s", keyDict['s'], "Create OK", '')
+        if retCode != "TAOS_OK":
+            tdLog.exit("taos -s fail")
+
+        keyDict['s'] = "\"insert into db1.tb2 values (now, 2)\""
+        retCode = taos_command(buildPath, "s", keyDict['s'], "Insert OK", '')
+        if retCode != "TAOS_OK":
+            tdLog.exit("taos -s fail")
+
+        tdSql.query("select count(*) from stb group by tg1")
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 1)
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())