BinShi-SecularBird commented on a change in pull request #482: PHOENIX-4925 Use a Variant Segment tree to organize Guide Post Info URL: https://github.com/apache/phoenix/pull/482#discussion_r298720129
########## File path: phoenix-core/src/it/java/org/apache/phoenix/end2end/ExplainPlanWithMultipleRowsPerGuidePostIT.java ########## @@ -0,0 +1,303 @@ +/* + * 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.junit.Assert.assertEquals; +import static org.junit.Assert.assertFalse; +import static org.junit.Assert.assertTrue; + +import java.sql.Connection; +import java.sql.DriverManager; +import java.sql.ResultSet; +import java.util.List; +import java.util.Map; + +import com.google.common.collect.Maps; +import org.apache.phoenix.query.QueryServices; +import org.apache.phoenix.util.ReadOnlyProps; +import org.junit.BeforeClass; +import org.junit.Test; + +import com.google.common.collect.Lists; + +/** + * This class has tests for asserting the bytes and rows information exposed in the explain plan + * when statistics with big Guide Post Width are enabled. + */ +public class ExplainPlanWithMultipleRowsPerGuidePostIT extends ParallelStatsEnabledIT { + @BeforeClass + public static final void doSetup() throws Exception { + Map<String, String> props = Maps.newHashMapWithExpectedSize(1); + props.put(QueryServices.STATS_GUIDEPOST_WIDTH_BYTES_ATTRIB, Long.toString(1000)); + props.put(QueryServices.STATS_TARGETED_CHUNK_SIZE, Integer.toString(4)); + props.put(QueryServices.STATS_UPDATE_FREQ_MS_ATTRIB, Long.toString(5)); + props.put(QueryServices.MAX_SERVER_METADATA_CACHE_TIME_TO_LIVE_MS_ATTRIB, Long.toString(5)); + props.put(QueryServices.USE_STATS_FOR_PARALLELIZATION, Boolean.toString(true)); + setUpTestDriver(new ReadOnlyProps(props.entrySet().iterator())); + } + + @Test + public void testSelectQueriesWithStatsForParallelizationOff() throws Exception { + testSelectQueriesWithFilters(false); + } + + @Test + public void testSelectQueriesWithStatsForParallelizationOn() throws Exception { + testSelectQueriesWithFilters(true); + } + + private void testSelectQueriesWithFilters(boolean useStatsForParallelization) throws Exception { + String tableName = generateUniqueName(); + try (Connection conn = DriverManager.getConnection(getUrl())) { + String ddl = + "CREATE TABLE " + tableName + " (k INTEGER PRIMARY KEY, a bigint, b bigint)" + + " USE_STATS_FOR_PARALLELIZATION=" + useStatsForParallelization + + " SPLIT ON (200, 300, 400)"; + conn.createStatement().execute(ddl); + for (Integer i = 100; i < 500; i++) { + String strVal = i.toString(); + String strVals = "(" + strVal + "," + strVal + "," + strVal + ")"; + conn.createStatement().execute("upsert into " + tableName + " values " + strVals); + } + conn.commit(); + conn.createStatement().execute("UPDATE STATISTICS " + tableName + ""); + } + + // Guide Post Tree constructed in this test case: + // (UNBOUND, UNBOUND) + // / \ + // / \ + // (UNBOUND, 339] (339, UNBOUND) + // / \ / \ + // / \ / \ + // (UNBOUND, 219] (219, 339] (339, 459] \ + // / \ / \ / \ \ + // / \ / \ / \ \ + // (UNBOUND, 179] \ (219, 299] \ (339, 419] \ (459, UNBOUND) + // / \ \ / \ \ / \ \ / \ + // (UNBOUND, 139] (139 179] (179, 219] (219, 259] (259, 299] (299, 339] (339, 379] (379, 419] (419, 459] (459, 499] (499, UNBOUND) + List<Object> binds = Lists.newArrayList(); + try (Connection conn = DriverManager.getConnection(getUrl())) { + int[] result; + Long estimatedBytesPerRow = 100L; + + // Query without any filter. Query Key Range (UNBOUND, UNBOUND). + String sql = "SELECT a FROM " + tableName; + ResultSet rs = conn.createStatement().executeQuery(sql); + int i = 0; + int numRows = 400; + int estimatedRows = 400; + while (rs.next()) { + assertEquals(100 + i, rs.getInt(1)); + i++; + } + assertEquals(numRows, i); + // Hit all guide posts. + Estimate info = getByteRowEstimates(conn, sql, binds); + assertEquals(Long.valueOf(estimatedRows), info.getEstimatedRows()); + assertEquals((Long) (estimatedRows * estimatedBytesPerRow), info.getEstimatedBytes()); + assertTrue(info.getEstimateInfoTs() > 0); + + + // Query whose start key is before any data. Query Key Range [99, UNBOUND). + sql = "SELECT a FROM " + tableName + " WHERE K >= 99"; + rs = conn.createStatement().executeQuery(sql); + i = 0; + numRows = 400; + estimatedRows = 400; + while (rs.next()) { + assertEquals(100 + i, rs.getInt(1)); + i++; + } + assertEquals(numRows, i); + // Hit all guide posts. + info = getByteRowEstimates(conn, sql, binds); + assertEquals(Long.valueOf(estimatedRows), info.getEstimatedRows()); + assertEquals((Long) (estimatedRows * estimatedBytesPerRow), info.getEstimatedBytes()); + assertTrue(info.getEstimateInfoTs() > 0); + + // Query whose start key is after any data. Query Key Range [500, UNBOUND). + sql = "SELECT a FROM " + tableName + " WHERE K >= 500"; + rs = conn.createStatement().executeQuery(sql); + assertFalse(rs.next()); + // Hit zero guide posts. + info = getByteRowEstimates(conn, sql, binds); + estimatedRows = 0; + assertEquals(Long.valueOf(estimatedRows), info.getEstimatedRows()); + assertEquals((Long) (estimatedRows * estimatedBytesPerRow), info.getEstimatedBytes()); + assertTrue(info.getEstimateInfoTs() > 0); + + // Query whose end key is before any data. Query Key Range (UNBOUND, 98]. + sql = "SELECT a FROM " + tableName + " WHERE K <= 98"; + rs = conn.createStatement().executeQuery(sql); + assertFalse(rs.next()); + // Hit the first guide post. + info = getByteRowEstimates(conn, sql, binds); + estimatedRows = 10; Review comment: Because the query will hit the first guide post which has key 100. This guide post contains 10 estimated rows. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
