/*
 * 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.phoenix.end2end;

import static org.apache.phoenix.util.TestUtil.TEST_PROPERTIES;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Map;
import java.util.Properties;
import org.apache.phoenix.query.BaseTest;
import org.apache.phoenix.query.QueryServices;
import org.apache.phoenix.util.PropertiesUtil;
import org.apache.phoenix.util.ReadOnlyProps;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;

import org.apache.phoenix.thirdparty.com.google.common.collect.Maps;

@Category(NeedsOwnMiniClusterTest.class)
public class CountDistinctCompressionIT extends BaseTest {
  @BeforeClass
  public static synchronized void doSetup() throws Exception {
    Map<String, String> props = Maps.newHashMapWithExpectedSize(3);
    // Must update config before starting server
    props.put(QueryServices.DISTINCT_VALUE_COMPRESS_THRESHOLD_ATTRIB, Long.toString(1));
    setUpTestDriver(new ReadOnlyProps(props.entrySet().iterator()));
  }

  @Test
  public void testDistinctCountOnColumn() throws Exception {
    String tenantId = getOrganizationId();
    String tableName = initATableValues(null, tenantId, getDefaultSplits(tenantId), (Date) null,
      null, getUrl(), null);

    String query = "SELECT count(DISTINCT A_STRING) FROM " + tableName;

    Properties props = PropertiesUtil.deepCopy(TEST_PROPERTIES);
    Connection conn = DriverManager.getConnection(getUrl(), props);
    try {
      PreparedStatement statement = conn.prepareStatement(query);
      ResultSet rs = statement.executeQuery();
      assertTrue(rs.next());
      assertEquals(3, rs.getLong(1));
      assertFalse(rs.next());
    } finally {
      conn.close();
    }
  }
}
