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Optimize join when build side is large
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171
presto-main/src/main/java/com/facebook/presto/sql/planner/optimizations/JoinPrefilter.java
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|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| /* | ||
| * 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.optimizations; | ||
|
|
||
| import com.facebook.presto.Session; | ||
| import com.facebook.presto.metadata.Metadata; | ||
| import com.facebook.presto.spi.VariableAllocator; | ||
| import com.facebook.presto.spi.WarningCollector; | ||
| import com.facebook.presto.spi.plan.AggregationNode; | ||
| import com.facebook.presto.spi.plan.EquiJoinClause; | ||
| import com.facebook.presto.spi.plan.FilterNode; | ||
| import com.facebook.presto.spi.plan.PlanNode; | ||
| import com.facebook.presto.spi.plan.PlanNodeIdAllocator; | ||
| import com.facebook.presto.spi.relation.VariableReferenceExpression; | ||
| import com.facebook.presto.sql.planner.TypeProvider; | ||
| import com.facebook.presto.sql.planner.plan.JoinNode; | ||
| import com.facebook.presto.sql.planner.plan.SemiJoinNode; | ||
| import com.facebook.presto.sql.planner.plan.SimplePlanRewriter; | ||
| import com.google.common.collect.ImmutableList; | ||
| import com.google.common.collect.ImmutableMap; | ||
|
|
||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Optional; | ||
|
|
||
| import static com.facebook.presto.SystemSessionProperties.isJoinPrefilterEnabled; | ||
| import static com.facebook.presto.common.type.BooleanType.BOOLEAN; | ||
| import static com.facebook.presto.spi.plan.AggregationNode.singleGroupingSet; | ||
| import static com.facebook.presto.spi.plan.JoinType.INNER; | ||
| import static com.facebook.presto.spi.plan.JoinType.LEFT; | ||
| import static com.facebook.presto.sql.planner.PlannerUtils.clonePlanNode; | ||
| import static com.facebook.presto.sql.planner.PlannerUtils.isScanFilterProject; | ||
| import static com.facebook.presto.sql.planner.PlannerUtils.projectExpressions; | ||
| import static com.facebook.presto.sql.planner.plan.ChildReplacer.replaceChildren; | ||
| import static java.util.Objects.requireNonNull; | ||
|
|
||
| public class JoinPrefilter | ||
| implements PlanOptimizer | ||
| { | ||
| private final Metadata metadata; | ||
| private boolean isEnabledForTesting; | ||
|
|
||
| public JoinPrefilter(Metadata metadata) | ||
| { | ||
| this.metadata = requireNonNull(metadata, "metadata is null"); | ||
| } | ||
|
|
||
| @Override | ||
| public void setEnabledForTesting(boolean isSet) | ||
| { | ||
| isEnabledForTesting = isSet; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean isEnabled(Session session) | ||
| { | ||
| return isEnabledForTesting || isJoinPrefilterEnabled(session); | ||
| } | ||
|
|
||
| @Override | ||
| public PlanOptimizerResult optimize(PlanNode plan, Session session, TypeProvider types, VariableAllocator variableAllocator, PlanNodeIdAllocator idAllocator, WarningCollector warningCollector) | ||
| { | ||
| if (isEnabled(session)) { | ||
| Rewriter rewriter = new Rewriter(session, metadata, idAllocator, variableAllocator); | ||
| PlanNode rewritten = SimplePlanRewriter.rewriteWith(rewriter, plan, null); | ||
| return PlanOptimizerResult.optimizerResult(rewritten, rewriter.isPlanChanged()); | ||
| } | ||
|
|
||
| return PlanOptimizerResult.optimizerResult(plan, false); | ||
| } | ||
|
|
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| private static class Rewriter | ||
| extends SimplePlanRewriter<Void> | ||
| { | ||
| private final Session session; | ||
| private final Metadata metadata; | ||
| private final PlanNodeIdAllocator idAllocator; | ||
| private final VariableAllocator variableAllocator; | ||
| private boolean planChanged; | ||
|
|
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| private Rewriter(Session session, Metadata metadata, PlanNodeIdAllocator idAllocator, VariableAllocator variableAllocator) | ||
| { | ||
| this.session = requireNonNull(session, "session is null"); | ||
| this.metadata = requireNonNull(metadata, "functionAndTypeManager is null"); | ||
| this.idAllocator = requireNonNull(idAllocator, "idAllocator is null"); | ||
| this.variableAllocator = requireNonNull(variableAllocator, "idAllocator is null"); | ||
| } | ||
|
|
||
| @Override | ||
| public PlanNode visitJoin(JoinNode node, RewriteContext<Void> context) | ||
| { | ||
| PlanNode left = node.getLeft(); | ||
| PlanNode right = node.getRight(); | ||
|
|
||
| PlanNode rewrittenLeft = rewriteWith(this, left); | ||
| PlanNode rewrittenRight = rewriteWith(this, right); | ||
| List<EquiJoinClause> equiJoinClause = node.getCriteria(); | ||
|
|
||
| // We apply this for only left and inner join and the right side of the join is a simple scan and the join is on one key | ||
| if (equiJoinClause.size() == 1 && | ||
| (node.getType() == LEFT || node.getType() == INNER) && | ||
| isScanFilterProject(rewrittenLeft)) { | ||
| VariableReferenceExpression leftKey = equiJoinClause.stream().map(x -> x.getLeft()).findFirst().get(); | ||
| VariableReferenceExpression rightKey = equiJoinClause.stream().map(x -> x.getRight()).findFirst().get(); | ||
|
|
||
| // First create a SELECT DISTINCT leftKey FROM left | ||
| Map<VariableReferenceExpression, VariableReferenceExpression> leftVarMap = new HashMap(); | ||
| PlanNode leftKeys = clonePlanNode(rewrittenLeft, session, metadata, idAllocator, ImmutableList.of(leftKey), leftVarMap); | ||
| PlanNode projectNode = projectExpressions(leftKeys, idAllocator, variableAllocator, ImmutableList.of(leftVarMap.get(leftKey)), ImmutableList.of()); | ||
|
|
||
| // DISTINCT on the leftkey | ||
| PlanNode filteringSource = new AggregationNode( | ||
| leftKey.getSourceLocation(), | ||
| idAllocator.getNextId(), | ||
| projectNode, | ||
| ImmutableMap.of(), | ||
| singleGroupingSet(projectNode.getOutputVariables()), | ||
| projectNode.getOutputVariables(), | ||
| AggregationNode.Step.SINGLE, | ||
| Optional.empty(), | ||
| Optional.empty(), | ||
| Optional.empty()); | ||
|
|
||
| // There should be only one output variable. Project that | ||
| filteringSource = projectExpressions(filteringSource, idAllocator, variableAllocator, ImmutableList.of(filteringSource.getOutputVariables().get(0)), ImmutableList.of()); | ||
|
|
||
| // Now we add a semijoin as the right side | ||
| VariableReferenceExpression semiJoinOutput = variableAllocator.newVariable("semiJoinOutput", BOOLEAN); | ||
| SemiJoinNode semiJoinNode = new SemiJoinNode( | ||
| rightKey.getSourceLocation(), | ||
| idAllocator.getNextId(), | ||
| node.getStatsEquivalentPlanNode(), | ||
| rewrittenRight, | ||
| filteringSource, | ||
| rightKey, | ||
| filteringSource.getOutputVariables().get(0), | ||
| semiJoinOutput, | ||
| Optional.empty(), | ||
| Optional.empty(), | ||
| Optional.empty(), | ||
| ImmutableMap.of()); | ||
|
|
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| rewrittenRight = new FilterNode(semiJoinNode.getSourceLocation(), idAllocator.getNextId(), semiJoinNode, semiJoinOutput); | ||
| } | ||
|
|
||
| if (rewrittenLeft != node.getLeft() || rewrittenRight != node.getRight()) { | ||
| planChanged = true; | ||
| return replaceChildren(node, ImmutableList.of(rewrittenLeft, rewrittenRight)); | ||
| } | ||
|
|
||
| return node; | ||
| } | ||
|
|
||
| public boolean isPlanChanged() | ||
| { | ||
| return planChanged; | ||
| } | ||
| } | ||
| } |
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