diff --git a/source/libs/executor/src/mergeoperator.c b/source/libs/executor/src/mergeoperator.c
index caef9e1de6..c1a51898bc 100755
--- a/source/libs/executor/src/mergeoperator.c
+++ b/source/libs/executor/src/mergeoperator.c
@@ -288,7 +288,6 @@ SSDataBlock* doNonSortMerge(SOperatorInfo* pOperator) {
   if (!pBlock) {
     return NULL;
   }
-  blockDataCleanup(pRes);
   copyDataBlock(pRes, pBlock);
 
   return pRes;