/**
* 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.drill;
import org.apache.drill.common.util.TestTools;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class TestSelectivity extends BaseTestQuery {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TestSelectivity.class);
@Test
public void testFilterSelectivityOptions() throws Exception {
/* Tests to check setting options works as expected */
test(String.format("alter system set `planner.filter.min_selectivity_estimate_factor` = %f", 0.25));
test(String.format("alter system set `planner.filter.max_selectivity_estimate_factor` = %f", 0.75));
String query1 = String.format("alter session set `planner.filter.min_selectivity_estimate_factor` = %f", -0.5);
String errMsg1 = "Option planner.filter.min_selectivity_estimate_factor must be between 0.000000 and 1.000000";
BaseTestQuery.errorMsgTestHelper(query1, errMsg1);
String query2 = String.format("alter session set `planner.filter.min_selectivity_estimate_factor` = %f", 0.85);
String errMsg2 = "Option planner.filter.min_selectivity_estimate_factor must be less than or equal to"
+ " Option planner.filter.max_selectivity_estimate_factor";
BaseTestQuery.errorMsgTestHelper(query2, errMsg2);
String query3 = String.format("alter session set `planner.filter.max_selectivity_estimate_factor` = %f", 1.5);
String errMsg3 = "Option planner.filter.max_selectivity_estimate_factor must be between 0.000000 and 1.000000";
BaseTestQuery.errorMsgTestHelper(query3, errMsg3);
String query4 = String.format("alter session set `planner.filter.max_selectivity_estimate_factor` = %f", 0.15);
String errMsg4 = "Option planner.filter.max_selectivity_estimate_factor must be greater than or equal to"
+ " Option planner.filter.min_selectivity_estimate_factor";
BaseTestQuery.errorMsgTestHelper(query4, errMsg4);
test(String.format("alter session set `planner.filter.max_selectivity_estimate_factor` = %f", 1.0));
test(String.format("alter session set `planner.filter.min_selectivity_estimate_factor` = %f", 0.9));
/* End of tests to check setting options */
/* Capping the selectivity prevents underestimation of filtered rows */
String query = " select employee_id from cp.`employee.json` where employee_id < 10 and department_id > 5";
test(String.format("alter session set `planner.filter.min_selectivity_estimate_factor` = %f", 0.1));
final String[] expectedPlan1 = {"Filter\\(condition.*\\).*rowcount = 115.75,.*",
"Scan.*columns=\\[`employee_id`, `department_id`\\].*rowcount = 463.0.*"};
PlanTestBase.testPlanWithAttributesMatchingPatterns(query, expectedPlan1, new String[]{});
test(String.format("alter session set `planner.filter.min_selectivity_estimate_factor` = %f", 0.9));
final String[] expectedPlan2 = {"Filter\\(condition.*\\).*rowcount = 416.7,.*",
"Scan.*columns=\\[`employee_id`, `department_id`\\].*rowcount = 463.0.*"};
PlanTestBase.testPlanWithAttributesMatchingPatterns(query, expectedPlan2, new String[]{});
}
}