fix(query): add a little bit more check when build SqlFunctionCtx.

source/libs/executor/src/executorimpl.c

@@ -5913,7 +5913,9 @@ SOperatorInfo* createAggregateOperatorInfo(SOperatorInfo* downstream, SExprInfo*
   setFunctionResultOutput(&pInfo->binfo, &pInfo->aggSup, MAIN_SCAN, pTaskInfo);
   pInfo->pScalarExprInfo = pScalarExprInfo;
   pInfo->numOfScalarExpr = numOfScalarExpr;
+  if (pInfo->pScalarExprInfo != NULL) {
     pInfo->pScalarCtx = createSqlFunctionCtx(pScalarExprInfo, numOfCols, &pInfo->rowCellInfoOffset);
+  }
 
   pOperator->name         = "TableAggregate";
   pOperator->operatorType = QUERY_NODE_PHYSICAL_PLAN_AGG;