diff --git a/dbms/src/Flash/Coprocessor/DAGExpressionAnalyzerHelper.cpp b/dbms/src/Flash/Coprocessor/DAGExpressionAnalyzerHelper.cpp
index e89331b7019..4cf0f54ebb3 100644
--- a/dbms/src/Flash/Coprocessor/DAGExpressionAnalyzerHelper.cpp
+++ b/dbms/src/Flash/Coprocessor/DAGExpressionAnalyzerHelper.cpp
@@ -169,7 +169,7 @@ String DAGExpressionAnalyzerHelper::buildInFunction(
     actions->add(ExpressionAction::addColumn(column));
     argument_names.push_back(column.name);
 
-    auto collator = getCollatorFromExpr(expr);
+    const auto * collator = getCollatorFromExpr(expr);
 
     String expr_name = analyzer->applyFunction(func_name, argument_names, actions, collator);
     if (set->remaining_exprs.empty())