diff --git a/source/libs/executor/src/groupoperator.c b/source/libs/executor/src/groupoperator.c
index 5690389302c46a520ca76f8ce15020ff9175c1f5..c1e5252089c7a03e4b56cb487e0a926431e1296d 100644
--- a/source/libs/executor/src/groupoperator.c
+++ b/source/libs/executor/src/groupoperator.c
@@ -507,6 +507,7 @@ static void doHashPartition(SOperatorInfo* pOperator, SSDataBlock* pBlock) {
           colDataSetNull_f(bitmap, (*rows));
         } else {
           memcpy(data + (*columnLen), colDataGetData(pColInfoData, j), bytes);
+          ASSERT((data + (*columnLen) + bytes - (char*)pPage) <= getBufPageSize(pInfo->pBuf));
         }
         contentLen = bytes;
       }