add test for insert set (#4011)

* add test for `insert set`

* change directory

sharding-sql-test/src/main/resources/sql/visitor/dml/insert.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one or more
+  ~ contributor license agreements.  See the NOTICE file distributed with
+  ~ this work for additional information regarding copyright ownership.
+  ~ The ASF licenses this file to You under the Apache License, Version 2.0
+  ~ (the "License"); you may not use this file except in compliance with
+  ~ the License.  You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<sql-cases>
+    <sql-case id="insert_set_with_all_placeholders" value="INSERT INTO t_order SET order_id = ?, user_id = ?, status = ?" db-types="MySQL" />
+</sql-cases>

shardingsphere-sql-parser/shardingsphere-sql-parser-mysql/src/main/java/org/apache/shardingsphere/sql/parser/MySQLVisitor.java

@@ -243,8 +243,8 @@ public ASTNode visitSimpleExpr(final SimpleExprContext ctx) {
         if (null != ctx.parameterMarker()) {
             return visit(ctx.parameterMarker());
         }
-        if (null !=  ctx.literals()) {
-            return visit( ctx.literals());
+        if (null != ctx.literals()) {
+            return visit(ctx.literals());
         }
         return new LiteralValue(ctx.getText());
     }

shardingsphere-sql-parser/shardingsphere-sql-parser-test/src/test/resources/visitor/dml/insert.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one or more
+  ~ contributor license agreements.  See the NOTICE file distributed with
+  ~ this work for additional information regarding copyright ownership.
+  ~ The ASF licenses this file to You under the Apache License, Version 2.0
+  ~ (the "License"); you may not use this file except in compliance with
+  ~ the License.  You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<parser-result-sets>
+    <parser-result sql-case-id="insert_set_with_all_placeholders" parameters="1, 1, 'init'">
+        <tables>
+            <table name="t_order" start-index="12" stop-index="18" />
+        </tables>
+        <tokens>
+            <insert-set-token begin-position="20" />
+        </tokens>
+        <sharding-conditions>
+            <and-condition>
+                <condition column-name="order_id" table-name="t_order" operator="EQUAL">
+                    <value index="0" literal="1" type="int" />
+                </condition>
+                <condition column-name="user_id" table-name="t_order" operator="EQUAL">
+                    <value index="1" literal="1" type="int" />
+                </condition>
+            </and-condition>
+        </sharding-conditions>
+    </parser-result>
+</parser-result-sets>