diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 927bf27146da8ecc859bffc460bc7dd494015f9d..eb848527e24175dcc7015491315942cb5e28d727 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -1176,13 +1176,15 @@ int32_t doCopyRowsFromFileBlock(STsdbQueryHandle* pQueryHandle, int32_t capacity
 }
 
 static void copyOneRowFromMem(STsdbQueryHandle* pQueryHandle, int32_t capacity, int32_t numOfRows, SDataRow row,
-                              int32_t numOfCols, STable* pTable) {
+                              int32_t numOfCols, STable* pTable, STSchema* pSchema) {
   char* pData = NULL;
 
   // the schema version info is embeded in SDataRow
-  STSchema* pSchema = tsdbGetTableSchemaByVersion(pTable, dataRowVersion(row));
   int32_t numOfRowCols = schemaNCols(pSchema);
-
+  if (pSchema == NULL) {
+    pSchema = tsdbGetTableSchemaByVersion(pTable, dataRowVersion(row));
+  }
+  
   int32_t i = 0, j = 0;
   while(i < numOfCols && j < numOfRowCols) {
     SColumnInfoData* pColInfo = taosArrayGet(pQueryHandle->pColumns, i);
@@ -1199,10 +1201,38 @@ static void copyOneRowFromMem(STsdbQueryHandle* pQueryHandle, int32_t capacity,
 
     if (pSchema->columns[j].colId == pColInfo->info.colId) {
       void* value = tdGetRowDataOfCol(row, (int8_t)pColInfo->info.type, TD_DATA_ROW_HEAD_SIZE + pSchema->columns[j].offset);
-      if (pColInfo->info.type == TSDB_DATA_TYPE_BINARY || pColInfo->info.type == TSDB_DATA_TYPE_NCHAR) {
-        memcpy(pData, value, varDataTLen(value));
-      } else {
-        memcpy(pData, value, pColInfo->info.bytes);
+      switch (pColInfo->info.type) {
+        case TSDB_DATA_TYPE_BINARY:
+        case TSDB_DATA_TYPE_NCHAR:
+          memcpy(pData, value, varDataTLen(value));
+          break;
+        case TSDB_DATA_TYPE_NULL:
+        case TSDB_DATA_TYPE_BOOL:
+        case TSDB_DATA_TYPE_TINYINT:
+        case TSDB_DATA_TYPE_UTINYINT:  
+          *(uint8_t *)pData = *(uint8_t *)value;
+          break;
+        case TSDB_DATA_TYPE_SMALLINT:
+        case TSDB_DATA_TYPE_USMALLINT:
+          *(uint16_t *)pData = *(uint16_t *)value;
+          break;
+        case TSDB_DATA_TYPE_INT:
+        case TSDB_DATA_TYPE_UINT:
+          *(uint32_t *)pData = *(uint32_t *)value;
+          break;
+        case TSDB_DATA_TYPE_BIGINT:
+        case TSDB_DATA_TYPE_UBIGINT:
+        case TSDB_DATA_TYPE_TIMESTAMP:  
+          *(uint64_t *)pData = *(uint64_t *)value;
+          break;
+        case TSDB_DATA_TYPE_FLOAT:
+          SET_FLOAT_PTR(pData, value);
+          break;
+        case TSDB_DATA_TYPE_DOUBLE:
+          SET_DOUBLE_PTR(pData, value);
+          break;
+        default:
+          memcpy(pData, value, pColInfo->info.bytes);
       }
 
       j++;
@@ -1401,6 +1431,9 @@ static void doMergeTwoLevelData(STsdbQueryHandle* pQueryHandle, STableCheckInfo*
   // compared with the data from in-memory buffer, to generate the correct timestamp array list
   int32_t numOfRows = 0;
 
+  int16_t rv = -1;
+  STSchema* pSchema = NULL;
+
   int32_t pos = cur->pos;
   cur->win = TSWINDOW_INITIALIZER;
 
@@ -1429,7 +1462,12 @@ static void doMergeTwoLevelData(STsdbQueryHandle* pQueryHandle, STableCheckInfo*
 
       if ((key < tsArray[pos] && ASCENDING_TRAVERSE(pQueryHandle->order)) ||
           (key > tsArray[pos] && !ASCENDING_TRAVERSE(pQueryHandle->order))) {
-        copyOneRowFromMem(pQueryHandle, pQueryHandle->outputCapacity, numOfRows, row, numOfCols, pTable);
+        if (rv != dataRowVersion(row)) {
+          pSchema = tsdbGetTableSchemaByVersion(pTable, dataRowVersion(row));
+          rv = dataRowVersion(row);
+        }  
+        
+        copyOneRowFromMem(pQueryHandle, pQueryHandle->outputCapacity, numOfRows, row, numOfCols, pTable, pSchema);
         numOfRows += 1;
         if (cur->win.skey == TSKEY_INITIAL_VAL) {
           cur->win.skey = key;
@@ -1442,7 +1480,12 @@ static void doMergeTwoLevelData(STsdbQueryHandle* pQueryHandle, STableCheckInfo*
         moveToNextRowInMem(pCheckInfo);
       } else if (key == tsArray[pos]) {  // data in buffer has the same timestamp of data in file block, ignore it
         if (pCfg->update) {
-          copyOneRowFromMem(pQueryHandle, pQueryHandle->outputCapacity, numOfRows, row, numOfCols, pTable);
+          if (rv != dataRowVersion(row)) {
+            pSchema = tsdbGetTableSchemaByVersion(pTable, dataRowVersion(row));
+            rv = dataRowVersion(row);
+          }
+          
+          copyOneRowFromMem(pQueryHandle, pQueryHandle->outputCapacity, numOfRows, row, numOfCols, pTable, pSchema);
           numOfRows += 1;
           if (cur->win.skey == TSKEY_INITIAL_VAL) {
             cur->win.skey = key;
@@ -1987,6 +2030,8 @@ static int tsdbReadRowsFromCache(STableCheckInfo* pCheckInfo, TSKEY maxKey, int
 
   int64_t st = taosGetTimestampUs();
   STable* pTable = pCheckInfo->pTableObj;
+  int16_t rv = -1;
+  STSchema* pSchema = NULL;
 
   do {
     SDataRow row = getSDataRowInTableMem(pCheckInfo, pQueryHandle->order, pCfg->update);
@@ -2007,7 +2052,11 @@ static int tsdbReadRowsFromCache(STableCheckInfo* pCheckInfo, TSKEY maxKey, int
     }
 
     win->ekey = key;
-    copyOneRowFromMem(pQueryHandle, maxRowsToRead, numOfRows, row, numOfCols, pTable);
+    if (rv != dataRowVersion(row)) {
+      pSchema = tsdbGetTableSchemaByVersion(pTable, dataRowVersion(row));
+      rv = dataRowVersion(row);
+    }
+    copyOneRowFromMem(pQueryHandle, maxRowsToRead, numOfRows, row, numOfCols, pTable, pSchema);
 
     if (++numOfRows >= maxRowsToRead) {
       moveToNextRowInMem(pCheckInfo);
@@ -2090,7 +2139,7 @@ bool tsdbNextDataBlock(TsdbQueryHandleT* pHandle) {
         return false;
       }
 
-      copyOneRowFromMem(pQueryHandle, pQueryHandle->outputCapacity, 0, pRow, numOfCols, pCheckInfo->pTableObj);
+      copyOneRowFromMem(pQueryHandle, pQueryHandle->outputCapacity, 0, pRow, numOfCols, pCheckInfo->pTableObj, NULL);
       tfree(pRow);
 
       // update the last key value
@@ -2164,7 +2213,7 @@ bool tsdbNextDataBlockWithoutMerge(TsdbQueryHandleT* pHandle) {
         return false;
       }
 
-      copyOneRowFromMem(pQueryHandle, pQueryHandle->outputCapacity, 0, pRow, numOfCols, pCheckInfo->pTableObj);
+      copyOneRowFromMem(pQueryHandle, pQueryHandle->outputCapacity, 0, pRow, numOfCols, pCheckInfo->pTableObj, NULL);
       tfree(pRow);
 
       // update the last key value