OdpsSelectTest8.java

/*
 * 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.odps;

import java.util.List;

import org.junit.Assert;

import com.alibaba.druid.sql.SQLUtils;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
import com.alibaba.druid.stat.TableStat.Column;
import com.alibaba.druid.util.JdbcConstants;

import junit.framework.TestCase;

public class OdpsSelectTest8 extends TestCase {

    public void test_select() throws Exception {
        String sql = "select * from (select * from abc limit 1) a;";//
        Assert.assertEquals("SELECT *"
                + "\nFROM ("
                + "\n\tSELECT *"
                + "\n\tFROM abc"
                + "\n\tLIMIT 1"
                + "\n) a;", SQLUtils.formatOdps(sql));
        Assert.assertEquals("select *"
                + "\nfrom ("
                + "\n\tselect *"
                + "\n\tfrom abc"
                + "\n\tlimit 1"
                + "\n) a;", SQLUtils.formatOdps(sql, SQLUtils.DEFAULT_LCASE_FORMAT_OPTION));
        
        List<SQLStatement> statementList = SQLUtils.parseStatements(sql, JdbcConstants.ODPS);
        SQLStatement stmt = statementList.get(0);

        Assert.assertEquals(1, statementList.size());
        
        SchemaStatVisitor visitor = SQLUtils.createSchemaStatVisitor(JdbcConstants.ODPS);
        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());
        
        Assert.assertEquals(1, visitor.getTables().size());
        Assert.assertEquals(1, visitor.getColumns().size());
        Assert.assertEquals(0, visitor.getConditions().size());
        
        Assert.assertTrue(visitor.getColumns().contains(new Column("abc", "*")));
    }
    
}