tajo-core-tests/src/test/java/org/apache/tajo/engine/query/TestTruncateTable.java

/**
 * 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.
 */

package org.apache.tajo.engine.query;

import org.apache.tajo.QueryTestCaseBase;
import org.apache.tajo.exception.TajoException;
import org.junit.Test;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;


public class TestTruncateTable extends QueryTestCaseBase {

  @Test
  public final void testTruncateTable() throws Exception {
    try {
      ResultSet res = executeFile("table1_ddl.sql");
      res.close();
      assertTableExists("truncate_table1");

      res = executeString("select * from truncate_table1");
      int numRows = 0;
      while (res.next()) {
        numRows++;
      }
      assertEquals(8, numRows);
      res.close();

      executeString("truncate table truncate_table1");
      assertTableExists("truncate_table1");

      res = executeString("select * from truncate_table1");
      numRows = 0;
      while (res.next()) {
        numRows++;
      }
      assertEquals(0, numRows);
      res.close();
    } finally {
      executeString("DROP TABLE truncate_table1");
    }
  }

  @Test
  public final void testTruncateExternalTable() throws TajoException, SQLException {
    try {
      List<String> createdNames = executeDDL("table2_ddl.sql", "truncate_table2", "truncate_table2");
      assertTableExists(createdNames.get(0));

      ResultSet res = executeString("select * from truncate_table2");
      int numRows = 0;
      while (res.next()) {
        numRows++;
      }
      assertEquals(4, numRows);
      res.close();

      executeString("truncate table truncate_table2");
      fail("Can't truncate external table");
    } catch (Exception e) {
      // succeeded
      assertTableExists("truncate_table2");

      ResultSet res = executeString("select * from truncate_table2");
      int numRows = 0;
      while (res.next()) {
        numRows++;
      }
      assertEquals(4, numRows);
      res.close();
    } finally {
      executeString("DROP TABLE truncate_table2");
    }
  }
}