phoenix-core/src/it/java/org/apache/phoenix/end2end/CountDistinctCompressionIT.java

/*
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 * 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
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 * distributed under the License is distributed on an "AS IS" BASIS,
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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.QueryServices;
import org.apache.phoenix.util.PropertiesUtil;
import org.apache.phoenix.util.ReadOnlyProps;
import org.junit.BeforeClass;
import org.junit.Test;

import com.google.common.collect.Maps;


public class CountDistinctCompressionIT extends BaseUniqueNamesOwnClusterIT {
    @BeforeClass
    public static 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();
        }
    }
}