[TD-5504]<fix>fix tsdbRestoreLastColumns run time bug:memory heap overflow

src/tsdb/src/tsdbMain.c

@@ -722,7 +722,8 @@ static int tsdbRestoreLastColumns(STsdbRepo *pRepo, STable *pTable, SReadH* pRea
       // OK,let's load row from backward to get not-null column
       for (int32_t rowId = pBlock->numOfRows - 1; rowId >= 0; rowId--) {
         SDataCol *pDataCol = pReadh->pDCols[0]->cols + i;
-        tdAppendColVal(memRowDataBody(row), tdGetColDataOfRow(pDataCol, rowId), pCol->type, pCol->offset);
+        const void* pColData = tdGetColDataOfRow(pDataCol, rowId);
+        tdAppendColVal(memRowDataBody(row), pColData, pCol->type, pCol->offset);
         //SDataCol *pDataCol = readh.pDCols[0]->cols + j;
         void *value = tdGetRowDataOfCol(memRowDataBody(row), (int8_t)pCol->type, TD_DATA_ROW_HEAD_SIZE + pCol->offset);
         if (isNull(value, pCol->type)) {
@@ -735,7 +736,7 @@ static int tsdbRestoreLastColumns(STsdbRepo *pRepo, STable *pTable, SReadH* pRea
           continue;
         }
         // save not-null column
-        uint16_t bytes = IS_VAR_DATA_TYPE(pCol->type) ? varDataTLen(tdGetColDataOfRow(pDataCol, rowId)) : TYPE_BYTES[pCol->type];
+        uint16_t bytes = IS_VAR_DATA_TYPE(pCol->type) ? varDataTLen(pColData) : pCol->bytes;
         SDataCol *pLastCol = &(pTable->lastCols[idx]);
         pLastCol->pData = malloc(bytes);
         pLastCol->bytes = bytes;