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DistributedExecutionPlanner.java
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DistributedExecutionPlanner.java
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/*
* 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.Session;
import com.facebook.presto.split.SampledSplitSource;
import com.facebook.presto.split.SplitManager;
import com.facebook.presto.split.SplitSource;
import com.facebook.presto.sql.planner.plan.AggregationNode;
import com.facebook.presto.sql.planner.plan.DeleteNode;
import com.facebook.presto.sql.planner.plan.DistinctLimitNode;
import com.facebook.presto.sql.planner.plan.FilterNode;
import com.facebook.presto.sql.planner.plan.IndexJoinNode;
import com.facebook.presto.sql.planner.plan.JoinNode;
import com.facebook.presto.sql.planner.plan.LimitNode;
import com.facebook.presto.sql.planner.plan.MarkDistinctNode;
import com.facebook.presto.sql.planner.plan.MetadataDeleteNode;
import com.facebook.presto.sql.planner.plan.OutputNode;
import com.facebook.presto.sql.planner.plan.PlanNode;
import com.facebook.presto.sql.planner.plan.PlanVisitor;
import com.facebook.presto.sql.planner.plan.ProjectNode;
import com.facebook.presto.sql.planner.plan.RemoteSourceNode;
import com.facebook.presto.sql.planner.plan.RowNumberNode;
import com.facebook.presto.sql.planner.plan.SampleNode;
import com.facebook.presto.sql.planner.plan.SemiJoinNode;
import com.facebook.presto.sql.planner.plan.SortNode;
import com.facebook.presto.sql.planner.plan.TableFinishNode;
import com.facebook.presto.sql.planner.plan.TableScanNode;
import com.facebook.presto.sql.planner.plan.TableWriterNode;
import com.facebook.presto.sql.planner.plan.TopNNode;
import com.facebook.presto.sql.planner.plan.TopNRowNumberNode;
import com.facebook.presto.sql.planner.plan.UnionNode;
import com.facebook.presto.sql.planner.plan.UnnestNode;
import com.facebook.presto.sql.planner.plan.ValuesNode;
import com.facebook.presto.sql.planner.plan.WindowNode;
import com.google.common.collect.ImmutableList;
import javax.inject.Inject;
import java.util.Optional;
import static java.util.Objects.requireNonNull;
public class DistributedExecutionPlanner
{
private final SplitManager splitManager;
@Inject
public DistributedExecutionPlanner(SplitManager splitManager)
{
this.splitManager = requireNonNull(splitManager, "splitManager is null");
}
public StageExecutionPlan plan(SubPlan root, Session session)
{
PlanFragment currentFragment = root.getFragment();
// get splits for this fragment, this is lazy so split assignments aren't actually calculated here
Visitor visitor = new Visitor(session);
Optional<SplitSource> splits = currentFragment.getRoot().accept(visitor, null);
// create child stages
ImmutableList.Builder<StageExecutionPlan> dependencies = ImmutableList.builder();
for (SubPlan childPlan : root.getChildren()) {
dependencies.add(plan(childPlan, session));
}
return new StageExecutionPlan(
currentFragment,
splits,
dependencies.build());
}
private final class Visitor
extends PlanVisitor<Void, Optional<SplitSource>>
{
private final Session session;
private Visitor(Session session)
{
this.session = session;
}
@Override
public Optional<SplitSource> visitTableScan(TableScanNode node, Void context)
{
// get dataSource for table
SplitSource splitSource = splitManager.getSplits(session, node.getLayout().get());
return Optional.of(splitSource);
}
@Override
public Optional<SplitSource> visitJoin(JoinNode node, Void context)
{
Optional<SplitSource> leftSplits = node.getLeft().accept(this, context);
Optional<SplitSource> rightSplits = node.getRight().accept(this, context);
if (leftSplits.isPresent() && rightSplits.isPresent()) {
throw new IllegalArgumentException("Both left and right join nodes are partitioned"); // TODO: "partitioned" may not be the right term
}
return leftSplits.isPresent() ? leftSplits : rightSplits;
}
@Override
public Optional<SplitSource> visitSemiJoin(SemiJoinNode node, Void context)
{
Optional<SplitSource> sourceSplits = node.getSource().accept(this, context);
Optional<SplitSource> filteringSourceSplits = node.getFilteringSource().accept(this, context);
if (sourceSplits.isPresent() && filteringSourceSplits.isPresent()) {
throw new IllegalArgumentException("Both source and filteringSource semi join nodes are partitioned"); // TODO: "partitioned" may not be the right term
}
return sourceSplits.isPresent() ? sourceSplits : filteringSourceSplits;
}
@Override
public Optional<SplitSource> visitIndexJoin(IndexJoinNode node, Void context)
{
return node.getProbeSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitRemoteSource(RemoteSourceNode node, Void context)
{
// remote source node does not have splits
return Optional.empty();
}
@Override
public Optional<SplitSource> visitValues(ValuesNode node, Void context)
{
// values node does not have splits
return Optional.empty();
}
@Override
public Optional<SplitSource> visitFilter(FilterNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitSample(SampleNode node, Void context)
{
switch (node.getSampleType()) {
case BERNOULLI:
case POISSONIZED:
return node.getSource().accept(this, context);
case SYSTEM:
Optional<SplitSource> nodeSplits = node.getSource().accept(this, context);
if (nodeSplits.isPresent()) {
SplitSource sampledSplitSource = new SampledSplitSource(nodeSplits.get(), node.getSampleRatio());
return Optional.of(sampledSplitSource);
}
// table sampling on a sub query without splits is meaningless
return nodeSplits;
default:
throw new UnsupportedOperationException("Sampling is not supported for type " + node.getSampleType());
}
}
@Override
public Optional<SplitSource> visitAggregation(AggregationNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitMarkDistinct(MarkDistinctNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitWindow(WindowNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitRowNumber(RowNumberNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitTopNRowNumber(TopNRowNumberNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitProject(ProjectNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitUnnest(UnnestNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitTopN(TopNNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitOutput(OutputNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitLimit(LimitNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitDistinctLimit(DistinctLimitNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitSort(SortNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitTableWriter(TableWriterNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitTableFinish(TableFinishNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitDelete(DeleteNode node, Void context)
{
return node.getSource().accept(this, context);
}
@Override
public Optional<SplitSource> visitMetadataDelete(MetadataDeleteNode node, Void context)
{
// MetadataDelete node does not have splits
return Optional.empty();
}
@Override
public Optional<SplitSource> visitUnion(UnionNode node, Void context)
{
Optional<SplitSource> result = Optional.empty();
for (PlanNode child : node.getSources()) {
Optional<SplitSource> source = child.accept(this, context);
if (result.isPresent() && source.isPresent()) {
throw new IllegalArgumentException("Multiple children are source-distributed");
}
if (source.isPresent()) {
result = source;
}
}
return result;
}
@Override
protected Optional<SplitSource> visitPlan(PlanNode node, Void context)
{
throw new UnsupportedOperationException("not yet implemented: " + node.getClass().getName());
}
}
}