diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 1d27bbb765..ebb7b50692 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -821,7 +821,7 @@ static int32_t blockDataAssign(SColumnInfoData* pCols, const SSDataBlock* pDataB
 }
 
 static SColumnInfoData* createHelpColInfoData(const SSDataBlock* pDataBlock) {
-  int32_t rows = pDataBlock->info.rows;
+  int32_t rows = pDataBlock->info.capacity;
   size_t  numOfCols = taosArrayGetSize(pDataBlock->pDataBlock);
 
   SColumnInfoData* pCols = taosMemoryCalloc(numOfCols, sizeof(SColumnInfoData));