diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index b8321679e8926bbdbe2d7dd88f928da0c8f5761c..1d27bbb76584fc365c4ee7ea6c5da1c40e3259e1 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -246,7 +246,7 @@ int32_t colDataMergeCol(SColumnInfoData* pColumnInfoData, int32_t numOfRow1, int
   uint32_t finalNumOfRows = numOfRow1 + numOfRow2;
   if (IS_VAR_DATA_TYPE(pColumnInfoData->info.type)) {
     // Handle the bitmap
-    if (finalNumOfRows > *capacity || (numOfRow1 == 0 && pColumnInfoData->info.bytes != 0)) {
+    if (finalNumOfRows > (*capacity)) {
       char* p = taosMemoryRealloc(pColumnInfoData->varmeta.offset, sizeof(int32_t) * (numOfRow1 + numOfRow2));
       if (p == NULL) {
         return TSDB_CODE_OUT_OF_MEMORY;
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 16fbe7d1dbf9c28062e4a8de113c0ac9262d7938..937069b5cc013110369605096d57c49c76e9986b 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -620,7 +620,7 @@ static SSDataBlock* doTableScanImpl(SOperatorInfo* pOperator) {
     int32_t rows = 0;
     tsdbRetrieveDataBlockInfo(pTableScanInfo->dataReader, &rows, &pBInfo->uid, &pBInfo->window);
 
-    blockDataEnsureCapacity(pBlock, rows);
+    blockDataEnsureCapacity(pBlock, rows);  // todo remove it latter
     pBInfo->rows = rows;
 
     ASSERT(pBInfo->uid != 0);