diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index c9fe99bfcf..5e7dc1dfc6 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -4547,7 +4547,7 @@ SOperatorInfo* createGlobalAggregateOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv,
     len += pExpr[i].base.colBytes;
   }
 
-  int32_t numOfCols = (pInfo->orderColumnList != NULL)? taosArrayGetSize(pInfo->orderColumnList):0;
+  int32_t numOfCols = (pInfo->orderColumnList != NULL)? (int32_t) taosArrayGetSize(pInfo->orderColumnList):0;
   pInfo->prevRow = calloc(1, (POINTER_BYTES * numOfCols + len));
   int32_t offset = POINTER_BYTES * numOfCols;