diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index a7e9d4a01483543a0671970b7cf20a5ca3ae9258..bf1a658b51111a6ce487f6b3b8fb2025703deaf8 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -360,6 +360,7 @@ static void sortGroupResByOrderList(SGroupResInfo* pGroupResInfo, SQueryRuntimeE
                                .colBytes = bytes,
                                .resultRows = pGroupResInfo->pRows};
   taosArraySortPWithExt(pGroupResInfo->pRows, compareRowData, &support);
+  free(colData);
 }
 
 // setup the output buffer for each operator