ESQL: Enable pushing down LOOKUP JOIN past Project #127776
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0; you may not use this file except in compliance with the Elastic License | ||
| * 2.0. | ||
| */ | ||
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| package org.elasticsearch.xpack.esql.optimizer.rules.logical; | ||
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| import org.elasticsearch.common.io.stream.StreamOutput; | ||
| import org.elasticsearch.index.IndexMode; | ||
| import org.elasticsearch.xpack.esql.core.expression.Attribute; | ||
| import org.elasticsearch.xpack.esql.core.expression.AttributeSet; | ||
| import org.elasticsearch.xpack.esql.core.expression.FieldAttribute; | ||
| import org.elasticsearch.xpack.esql.core.expression.NameId; | ||
| import org.elasticsearch.xpack.esql.core.tree.NodeInfo; | ||
| import org.elasticsearch.xpack.esql.core.tree.Source; | ||
| import org.elasticsearch.xpack.esql.plan.GeneratingPlan; | ||
| import org.elasticsearch.xpack.esql.plan.logical.EsRelation; | ||
| import org.elasticsearch.xpack.esql.plan.logical.LogicalPlan; | ||
| import org.elasticsearch.xpack.esql.plan.logical.Project; | ||
| import org.elasticsearch.xpack.esql.plan.logical.UnaryPlan; | ||
| import org.elasticsearch.xpack.esql.plan.logical.join.Join; | ||
| import org.elasticsearch.xpack.esql.plan.logical.join.JoinType; | ||
| import org.elasticsearch.xpack.esql.plan.logical.join.JoinTypes; | ||
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| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| /** | ||
| * Pushing down {@link Join}s past {@link Project}s has the benefit that field extraction can happen later. Also, once bubbled downstream, | ||
| * multiple projects can be combined which can eliminate some fields altogether (c.f. | ||
| * {@link org.elasticsearch.xpack.esql.optimizer.rules.physical.local.InsertFieldExtraction}). Even just field extractions before joins are | ||
| * expensive because joins create new rows in case of multiple matches, which means that the extracted columns need to be deeply copied | ||
| * and blown up. | ||
| * | ||
| * This follows the same approach as {@link PushDownUtils#pushGeneratingPlanPastProjectAndOrderBy(UnaryPlan)}. To deal with name conflicts, | ||
| * we rename the fields that a {@code LOOKUP JOIN} "generates" by renaming the {@link FieldAttribute}s in the join's right hand side | ||
| * {@link EsRelation}. Once we have qualifiers, this can be simplified by just assigning temporary qualifiers and later stripping them away. | ||
| */ | ||
| public final class PushDownJoinPastProject extends OptimizerRules.OptimizerRule<Join> { | ||
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| /** | ||
| * Wrapper class for a {@link Join} representing a {@code LOOKUP JOIN}, so we can treat it as if it was a {@link UnaryPlan} that is also | ||
| * a {@link GeneratingPlan}; | ||
| */ | ||
| private class JoinAsUnaryGeneratingPlan extends UnaryPlan implements GeneratingPlan<JoinAsUnaryGeneratingPlan> { | ||
| private final Join lookupJoin; | ||
| private List<Attribute> lazyGeneratedAttributes; | ||
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| JoinAsUnaryGeneratingPlan(Join lookupJoin) { | ||
| super(lookupJoin.source(), lookupJoin.left()); | ||
| this.lookupJoin = lookupJoin; | ||
| } | ||
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| private JoinAsUnaryGeneratingPlan( | ||
| Source source, | ||
| LogicalPlan left, | ||
| LogicalPlan right, | ||
| JoinType type, | ||
| List<Attribute> matchFields, | ||
| List<Attribute> leftFields, | ||
| List<Attribute> rightFields | ||
| ) { | ||
| this(new Join(source, left, right, type, matchFields, leftFields, rightFields)); | ||
| } | ||
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| Join unwrap() { | ||
| return lookupJoin; | ||
| } | ||
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| @Override | ||
| public UnaryPlan replaceChild(LogicalPlan newChild) { | ||
| return new JoinAsUnaryGeneratingPlan(lookupJoin.replaceChildren(newChild, lookupJoin.right())); | ||
| } | ||
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| @Override | ||
| public boolean expressionsResolved() { | ||
| return lookupJoin.expressionsResolved(); | ||
| } | ||
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| @Override | ||
| protected NodeInfo<? extends LogicalPlan> info() { | ||
| return NodeInfo.create( | ||
| this, | ||
| JoinAsUnaryGeneratingPlan::new, | ||
| lookupJoin.left(), | ||
| lookupJoin.right(), | ||
| lookupJoin.config().type(), | ||
| lookupJoin.config().matchFields(), | ||
| lookupJoin.config().leftFields(), | ||
| lookupJoin.config().rightFields() | ||
| ); | ||
| } | ||
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| @Override | ||
| public String getWriteableName() { | ||
| throw new UnsupportedOperationException("lives only for a single optimizer rule application"); | ||
| } | ||
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| @Override | ||
| public void writeTo(StreamOutput out) throws IOException { | ||
| throw new UnsupportedOperationException("lives only for a single optimizer rule application"); | ||
| } | ||
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| @Override | ||
| public List<Attribute> generatedAttributes() { | ||
| if (lazyGeneratedAttributes == null) { | ||
| lazyGeneratedAttributes = lookupJoin.rightOutputFields(); | ||
| } | ||
| return lazyGeneratedAttributes; | ||
| } | ||
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| @Override | ||
| public JoinAsUnaryGeneratingPlan withGeneratedNames(List<String> newNames) { | ||
| checkNumberOfNewNames(newNames); | ||
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| if (lookupJoin.right() instanceof EsRelation esRelation) { | ||
| AttributeSet generatedSet = AttributeSet.of(generatedAttributes()); | ||
| int numOutputAttributes = esRelation.output().size(); | ||
| List<Attribute> newAttributes = new ArrayList<>(numOutputAttributes); | ||
| // The match field from the LOOKUP JOIN's right hand side EsRelation is not added to the output from the left hand side. | ||
| // It's not part of the "generated" attributes and needs to be skipped. | ||
| int newNamesIndex = 0; | ||
| for (Attribute attr : esRelation.output()) { | ||
| if (generatedSet.contains(attr)) { | ||
| String newName = newNames.get(newNamesIndex++); | ||
| if (newName.equals(attr.name())) { | ||
| newAttributes.add(attr); | ||
| } else { | ||
| newAttributes.add(attr.withName(newName).withId(new NameId())); | ||
| } | ||
| } else { | ||
| newAttributes.add(attr); | ||
| } | ||
| } | ||
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| assert newAttributes.size() == numOutputAttributes; | ||
| return new JoinAsUnaryGeneratingPlan( | ||
| lookupJoin.replaceChildren(lookupJoin.left(), esRelation.withAttributes(newAttributes)) | ||
| ); | ||
| } | ||
| throw new IllegalStateException( | ||
| "right hand side of LOOKUP JOIN must be a relation, found [" + lookupJoin.right().getClass() + "]" | ||
| ); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return lookupJoin.hashCode(); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object obj) { | ||
| if (this == obj) { | ||
| return true; | ||
| } | ||
| if (obj == null || getClass() != obj.getClass()) { | ||
| return false; | ||
| } | ||
| JoinAsUnaryGeneratingPlan other = (JoinAsUnaryGeneratingPlan) obj; | ||
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| return lookupJoin.equals(other.lookupJoin); | ||
| } | ||
| } | ||
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| @Override | ||
| protected LogicalPlan rule(Join join) { | ||
| if (join.left() instanceof Project projectChild | ||
| && JoinTypes.LEFT.equals(join.config().type()) | ||
| && join.right() instanceof EsRelation lookupIndex | ||
| && lookupIndex.indexMode() == IndexMode.LOOKUP) { | ||
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| var joinAsGeneratingUnary = new JoinAsUnaryGeneratingPlan(join); | ||
| var pushedDown = PushDownUtils.pushGeneratingPlanPastProjectAndOrderBy(joinAsGeneratingUnary); | ||
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| return pushedDown.transformDown(JoinAsUnaryGeneratingPlan.class, JoinAsUnaryGeneratingPlan::unwrap); | ||
| } | ||
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| return join; | ||
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| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -718,7 +718,8 @@ private PhysicalOperation planLookupJoin(LookupJoinExec join, LocalExecutionPlan | |
| private record MatchConfig(String fieldName, int channel, DataType type) { | ||
| private MatchConfig(FieldAttribute match, Layout.ChannelAndType input) { | ||
| // Note, this handles TEXT fields with KEYWORD subfields | ||
| // TODO: This probably also led to bugs for LOOKUP JOIN on a union typed field, let's add a test. | ||
| this(match.exactAttribute().fieldName(), input.channel(), input.type()); | ||
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Comment on lines
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+722
There was a problem hiding this comment. The diff touches multiple places that should have used field names but used attribute names, instead. To make this PR cleaner, I think we should have a separate PR just with these fixes + corresponding tests. This should also address #127521. |
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| } | ||
| } | ||
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Needs a comment: alias and reference attribute cases only relevant for ENRICH