/*
* Licensed 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 com.facebook.presto.sql.planner.iterative;
import com.facebook.presto.Session;
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.sql.planner.PlanNodeIdAllocator;
import com.facebook.presto.sql.planner.StatsRecorder;
import com.facebook.presto.sql.planner.SymbolAllocator;
import com.facebook.presto.sql.planner.optimizations.PlanOptimizer;
import com.facebook.presto.sql.planner.plan.Assignments;
import com.facebook.presto.sql.planner.plan.PlanNode;
import com.facebook.presto.sql.planner.plan.ProjectNode;
import com.facebook.presto.testing.LocalQueryRunner;
import com.facebook.presto.tpch.TpchConnectorFactory;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
import java.util.Optional;
import static com.facebook.presto.spi.StandardErrorCode.OPTIMIZER_TIMEOUT;
import static com.facebook.presto.testing.TestingSession.testSessionBuilder;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.fail;
public class TestIterativeOptimizer
{
private LocalQueryRunner queryRunner;
@BeforeClass
public void setUp()
{
Session.SessionBuilder sessionBuilder = testSessionBuilder()
.setCatalog("local")
.setSchema("tiny")
.setSystemProperty("task_concurrency", "1")
.setSystemProperty("iterative_optimizer_enabled", "true")
.setSystemProperty("iterative_optimizer_timeout", "1ms");
queryRunner = new LocalQueryRunner(sessionBuilder.build());
queryRunner.createCatalog(queryRunner.getDefaultSession().getCatalog().get(),
new TpchConnectorFactory(1),
ImmutableMap.of());
}
@AfterClass(alwaysRun = true)
public void tearDown()
{
if (queryRunner != null) {
queryRunner.close();
}
}
@Test(timeOut = 1000)
public void optimizerTimeoutsOnNonConvergingPlan()
{
PlanOptimizer optimizer = new IterativeOptimizer(new StatsRecorder(), ImmutableSet.of(new NonConvergingRule()));
try {
queryRunner.inTransaction(transactionSession -> {
queryRunner.createPlan(transactionSession, "SELECT * FROM nation", ImmutableList.of(optimizer));
fail("The optimizer should not converge");
return null;
});
}
catch (PrestoException ex) {
assertEquals(ex.getErrorCode(), OPTIMIZER_TIMEOUT.toErrorCode());
}
}
private static class NonConvergingRule
implements Rule
{
// This rewrite will produce an identity projection node unless one exists.
// In that case, it will be removed.
// Thanks to that approach, it never converges and always produces different node.
@Override
public Optional<PlanNode> apply(PlanNode node, Lookup lookup, PlanNodeIdAllocator idAllocator, SymbolAllocator symbolAllocator, Session session)
{
if (node instanceof ProjectNode) {
ProjectNode project = (ProjectNode) node;
if (isIdentityProjection(project)) {
return Optional.of(project.getSource());
}
}
PlanNode projectNode = new ProjectNode(idAllocator.getNextId(), node, Assignments.identity(node.getOutputSymbols()));
return Optional.of(projectNode);
}
private static boolean isIdentityProjection(ProjectNode project)
{
return ImmutableSet.copyOf(project.getOutputSymbols()).equals(ImmutableSet.copyOf(project.getSource().getOutputSymbols()));
}
}
}