add testcase for #3960

src/test/java/com/alibaba/druid/bvt/sql/mysql/select/MySqlSelectTest_315_issue_3960.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 1999-2017 Alibaba Group Holding Ltd.
+ *
+ * Licensed 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.
+ */
+package com.alibaba.druid.bvt.sql.mysql.select;
+
+import com.alibaba.druid.DbType;
+import com.alibaba.druid.sql.MysqlTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
+import com.alibaba.druid.util.Utils;
+
+import java.util.List;
+
+public class MySqlSelectTest_315_issue_3960
+        extends MysqlTest {
+    public void test_0() throws Exception {
+        String sql = "SELECT B FROM (SELECT A,B FROM table1 where C ='123456' ) WHERE A ='321'";
+
+        SQLStatement stmt = SQLUtils
+                .parseSingleStatement(sql, DbType.mysql);
+
+        MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        assertEquals(1, visitor.getTables().size());
+        assertEquals(3, visitor.getColumns().size());
+        assertEquals(1, visitor.getConditions().size());
+        assertEquals(0, visitor.getOrderByColumns().size());
+    }
+}