diff --git a/src/main/java/com/alibaba/druid/sql/ast/SQLExpr.java b/src/main/java/com/alibaba/druid/sql/ast/SQLExpr.java
index b5b5afb5e4..d31c2c18c0 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/SQLExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/SQLExpr.java
@@ -16,4 +16,5 @@
 package com.alibaba.druid.sql.ast;
 
 public interface SQLExpr extends SQLObject {
+
 }