/*
* 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;
import com.facebook.presto.index.IndexManager;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.split.SplitManager;
import com.facebook.presto.sql.analyzer.FeaturesConfig;
import com.facebook.presto.sql.parser.SqlParser;
import com.facebook.presto.sql.planner.optimizations.CanonicalizeExpressions;
import com.facebook.presto.sql.planner.optimizations.ImplementSampleAsFilter;
import com.facebook.presto.sql.planner.optimizations.IndexJoinOptimizer;
import com.facebook.presto.sql.planner.optimizations.LimitPushDown;
import com.facebook.presto.sql.planner.optimizations.MaterializeSamplePullUp;
import com.facebook.presto.sql.planner.optimizations.MergeProjections;
import com.facebook.presto.sql.planner.optimizations.PlanOptimizer;
import com.facebook.presto.sql.planner.optimizations.PredicatePushDown;
import com.facebook.presto.sql.planner.optimizations.PruneRedundantProjections;
import com.facebook.presto.sql.planner.optimizations.PruneUnreferencedOutputs;
import com.facebook.presto.sql.planner.optimizations.SetFlatteningOptimizer;
import com.facebook.presto.sql.planner.optimizations.SimplifyExpressions;
import com.facebook.presto.sql.planner.optimizations.UnaliasSymbolReferences;
import com.google.common.collect.ImmutableList;
import com.google.inject.Inject;
import javax.inject.Provider;
import java.util.List;
public class PlanOptimizersFactory
implements Provider<List<PlanOptimizer>>
{
private final List<PlanOptimizer> optimizers;
@Inject
public PlanOptimizersFactory(Metadata metadata, SqlParser sqlParser, SplitManager splitManager, IndexManager indexManager, FeaturesConfig featuresConfig)
{
ImmutableList.Builder<PlanOptimizer> builder = ImmutableList.builder();
builder.add(new ImplementSampleAsFilter(),
new CanonicalizeExpressions(),
new SimplifyExpressions(metadata, sqlParser),
new UnaliasSymbolReferences(),
new PruneRedundantProjections(),
new SetFlatteningOptimizer(),
new MaterializeSamplePullUp(),
new LimitPushDown(), // Run the LimitPushDown after flattening set operators to make it easier to do the set flattening
new PredicatePushDown(metadata, sqlParser, splitManager, featuresConfig.isExperimentalSyntaxEnabled()),
new PredicatePushDown(metadata, sqlParser, splitManager, featuresConfig.isExperimentalSyntaxEnabled()), // Run predicate push down one more time in case we can leverage new information from generated partitions
new MergeProjections(),
new SimplifyExpressions(metadata, sqlParser), // Re-run the SimplifyExpressions to simplify any recomposed expressions from other optimizations
new UnaliasSymbolReferences(), // Run again because predicate pushdown might add more projections
new IndexJoinOptimizer(indexManager), // Run this after projections and filters have been fully simplified and pushed down
new PruneUnreferencedOutputs(), // Make sure to run this at the end to help clean the plan for logging/execution and not remove info that other optimizers might need at an earlier point
new PruneRedundantProjections()); // This MUST run after PruneUnreferencedOutputs as it may introduce new redundant projections
// TODO: consider adding a formal final plan sanitization optimizer that prepares the plan for transmission/execution/logging
// TODO: figure out how to improve the set flattening optimizer so that it can run at any point
this.optimizers = builder.build();
}
@Override
public synchronized List<PlanOptimizer> get()
{
return optimizers;
}
}