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Enhance unnest support in decoupled mode (apache#17550)
1. adds DruidRelFieldTrimmer 2. Unnest now uses unnestFieldType instead of blindly taking the rowType 3. removed the possibly problematic column reuse in UnnestCleanupRule (the trimmer should take care of that) 4. lots of iq file changes because earlier no proper trimming was done below LogicalCorrelate and Unnest -s
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sql/src/main/java/org/apache/druid/sql/calcite/planner/DruidRelFieldTrimmer.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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. | ||
| */ | ||
|
|
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| package org.apache.druid.sql.calcite.planner; | ||
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| import com.google.common.collect.ImmutableList; | ||
| import org.apache.calcite.plan.RelOptUtil; | ||
| import org.apache.calcite.rel.RelHomogeneousShuttle; | ||
| import org.apache.calcite.rel.RelNode; | ||
| import org.apache.calcite.rel.core.CorrelationId; | ||
| import org.apache.calcite.rel.logical.LogicalCorrelate; | ||
| import org.apache.calcite.rel.type.RelDataType; | ||
| import org.apache.calcite.rel.type.RelDataTypeField; | ||
| import org.apache.calcite.rex.RexBuilder; | ||
| import org.apache.calcite.rex.RexCorrelVariable; | ||
| import org.apache.calcite.rex.RexFieldAccess; | ||
| import org.apache.calcite.rex.RexNode; | ||
| import org.apache.calcite.rex.RexPermuteInputsShuttle; | ||
| import org.apache.calcite.rex.RexShuttle; | ||
| import org.apache.calcite.rex.RexVisitor; | ||
| import org.apache.calcite.sql.validate.SqlValidator; | ||
| import org.apache.calcite.sql2rel.RelFieldTrimmer; | ||
| import org.apache.calcite.tools.RelBuilder; | ||
| import org.apache.calcite.util.ImmutableBitSet; | ||
| import org.apache.calcite.util.mapping.IntPair; | ||
| import org.apache.calcite.util.mapping.Mapping; | ||
| import org.apache.calcite.util.mapping.MappingType; | ||
| import org.apache.calcite.util.mapping.Mappings; | ||
| import org.apache.druid.sql.calcite.rule.logical.LogicalUnnest; | ||
| import org.checkerframework.checker.nullness.qual.Nullable; | ||
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|
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
|
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| /** | ||
| * DruidRelFieldTrimmer is a subclass of {@link RelFieldTrimmer} that provides additional support for Druid specific RelNodes. | ||
| * | ||
| * It is used to trim fields from Druid specific RelNodes like {@link LogicalUnnest}. | ||
| */ | ||
| public class DruidRelFieldTrimmer extends RelFieldTrimmer | ||
| { | ||
| private final RelBuilder relBuilder; | ||
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| public DruidRelFieldTrimmer(@Nullable SqlValidator validator, RelBuilder relBuilder) | ||
| { | ||
| super(validator, relBuilder); | ||
| this.relBuilder = relBuilder; | ||
| } | ||
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| @Override | ||
| protected TrimResult dummyProject(int fieldCount, RelNode input) | ||
| { | ||
| return makeIdentityMapping(input); | ||
| } | ||
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| @Override | ||
| protected TrimResult dummyProject(int fieldCount, RelNode input, | ||
| @Nullable RelNode originalRelNode) | ||
| { | ||
| if (fieldCount != 0) { | ||
| return super.dummyProject(fieldCount, input, originalRelNode); | ||
| } | ||
| // workaround to support fieldCount == 0 projections | ||
| final Mapping mapping = Mappings.create(MappingType.INVERSE_SURJECTION, fieldCount, 0); | ||
| if (input.getRowType().getFieldCount() == 0) { | ||
| // there is no need to do anything | ||
| return result(input, mapping); | ||
| } | ||
| relBuilder.push(input); | ||
| relBuilder.project(Collections.emptyList(), Collections.emptyList()); | ||
| RelNode newProject = relBuilder.build(); | ||
| if (originalRelNode != null) { | ||
| newProject = RelOptUtil.propagateRelHints(originalRelNode, newProject); | ||
| } | ||
| return result(newProject, mapping); | ||
| } | ||
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| private TrimResult makeIdentityMapping(RelNode input) | ||
| { | ||
| Mapping mapping = Mappings.createIdentity(input.getRowType().getFieldCount()); | ||
| return result(input, mapping); | ||
| } | ||
|
|
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| /** | ||
| * Should be unnecesarry in versions having CALCITE-6715 | ||
| */ | ||
| public TrimResult trimFields(LogicalCorrelate correlate, | ||
| ImmutableBitSet fieldsUsed, | ||
| Set<RelDataTypeField> extraFields) | ||
| { | ||
| if (!extraFields.isEmpty()) { | ||
| // bail out with generic trim | ||
| return trimFields((RelNode) correlate, fieldsUsed, extraFields); | ||
| } | ||
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| fieldsUsed = fieldsUsed.union(correlate.getRequiredColumns()); | ||
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| List<RelNode> newInputs = new ArrayList<>(); | ||
| List<Mapping> inputMappings = new ArrayList<>(); | ||
| int changeCount = 0; | ||
| int offset = 0; | ||
| for (RelNode input : correlate.getInputs()) { | ||
| final RelDataType inputRowType = input.getRowType(); | ||
| final int inputFieldCount = inputRowType.getFieldCount(); | ||
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| ImmutableBitSet currentInputFieldsUsed = fieldsUsed | ||
| .intersect(ImmutableBitSet.range(offset, offset + inputFieldCount)) | ||
| .shift(-offset); | ||
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| TrimResult trimResult; | ||
| try { | ||
| trimResult = dispatchTrimFields(input, currentInputFieldsUsed, extraFields); | ||
| } | ||
| catch (RuntimeException e) { | ||
| throw e; | ||
| } | ||
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| newInputs.add(trimResult.left); | ||
| if (trimResult.left != input) { | ||
| changeCount++; | ||
| } | ||
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| final Mapping inputMapping = trimResult.right; | ||
| inputMappings.add(inputMapping); | ||
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| offset += inputFieldCount; | ||
| } | ||
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| if (changeCount == 0) { | ||
| return result(correlate, Mappings.createIdentity(correlate.getRowType().getFieldCount())); | ||
| } | ||
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| Mapping mapping = makeMapping(inputMappings); | ||
| RexBuilder rexBuilder = correlate.getCluster().getRexBuilder(); | ||
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| final LogicalCorrelate newCorrelate = correlate.copy( | ||
| correlate.getTraitSet(), | ||
| newInputs.get(0), | ||
| newInputs.get(1).accept( | ||
| new RexRewritingRelShuttle( | ||
| new RexCorrelVariableMapShuttle(correlate.getCorrelationId(), newInputs.get(0).getRowType(), mapping, rexBuilder) | ||
| ) | ||
| ), | ||
| correlate.getCorrelationId(), | ||
| correlate.getRequiredColumns().permute(mapping), | ||
| correlate.getJoinType() | ||
| ); | ||
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| return result(newCorrelate, mapping); | ||
| } | ||
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| public TrimResult trimFields(LogicalUnnest correlate, | ||
| ImmutableBitSet fieldsUsed, | ||
| Set<RelDataTypeField> extraFields) | ||
| { | ||
| if (!extraFields.isEmpty()) { | ||
| // bail out with generic trim | ||
| return trimFields((RelNode) correlate, fieldsUsed, extraFields); | ||
| } | ||
| RelOptUtil.InputFinder inputFinder = new RelOptUtil.InputFinder(extraFields); | ||
|
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| correlate.getUnnestExpr().accept(inputFinder); | ||
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| ImmutableBitSet finderFields = inputFinder.build(); | ||
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| ImmutableBitSet inputFieldsUsed = ImmutableBitSet.builder() | ||
| .addAll(fieldsUsed.clear(correlate.getRowType().getFieldCount() - 1)) | ||
| .addAll(finderFields) | ||
| .build(); | ||
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| RelNode input = correlate.getInput(); | ||
|
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| // Create input with trimmed columns. | ||
| TrimResult trimResult = trimChild(correlate, input, inputFieldsUsed, extraFields); | ||
|
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| RelNode newInput = trimResult.left; | ||
| final Mapping inputMapping = trimResult.right; | ||
|
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| if (newInput == input) { | ||
| return result(correlate, Mappings.createIdentity(correlate.getRowType().getFieldCount())); | ||
| } | ||
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| Mapping mapping = makeMapping(ImmutableList.of(inputMapping, Mappings.createIdentity(1))); | ||
|
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| final RexVisitor<RexNode> shuttle = new RexPermuteInputsShuttle(inputMapping, newInput); | ||
|
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| RexNode newUnnestExpr = correlate.getUnnestExpr().accept(shuttle); | ||
| RexNode newFilterExpr = correlate.getFilter(); | ||
|
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| final LogicalUnnest newCorrelate = correlate.copy( | ||
| correlate.getTraitSet(), | ||
| newInput, | ||
| newUnnestExpr, | ||
| newFilterExpr | ||
| ); | ||
|
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| return result(newCorrelate, mapping); | ||
| } | ||
|
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| /** | ||
| * Concatenates multiple mapping. | ||
| * | ||
| * <pre> | ||
| * [ 1:0, 2:1] // sourceCount:100 | ||
| * [ 1:0, 2:1] // sourceCount:100 | ||
| * output: | ||
| * [ 1:0, 2:1, 101:2, 102:3 ] ; sourceCount:200 | ||
| * </pre> | ||
| */ | ||
| private Mapping makeMapping(List<Mapping> inputMappings) | ||
| { | ||
| int fieldCount = 0; | ||
| int newFieldCount = 0; | ||
| for (Mapping mapping : inputMappings) { | ||
| fieldCount += mapping.getSourceCount(); | ||
| newFieldCount += mapping.getTargetCount(); | ||
| } | ||
|
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| Mapping mapping = Mappings.create( | ||
| MappingType.INVERSE_SURJECTION, | ||
| fieldCount, | ||
| newFieldCount | ||
| ); | ||
| int offset = 0; | ||
| int newOffset = 0; | ||
| for (int i = 0; i < inputMappings.size(); i++) { | ||
| Mapping inputMapping = inputMappings.get(i); | ||
| for (IntPair pair : inputMapping) { | ||
| mapping.set(pair.source + offset, pair.target + newOffset); | ||
| } | ||
| offset += inputMapping.getSourceCount(); | ||
| newOffset += inputMapping.getTargetCount(); | ||
| } | ||
| return mapping; | ||
| } | ||
|
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| static class RexCorrelVariableMapShuttle extends RexShuttle | ||
| { | ||
| private final CorrelationId correlationId; | ||
| private final Mapping mapping; | ||
| private final RelDataType newCorrelRowType; | ||
| private final RexBuilder rexBuilder; | ||
|
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| public RexCorrelVariableMapShuttle(final CorrelationId correlationId, RelDataType newCorrelRowType, Mapping mapping, RexBuilder rexBuilder) | ||
| { | ||
| this.correlationId = correlationId; | ||
| this.newCorrelRowType = newCorrelRowType; | ||
| this.mapping = mapping; | ||
| this.rexBuilder = rexBuilder; | ||
| } | ||
|
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| @Override | ||
| public RexNode visitFieldAccess(final RexFieldAccess fieldAccess) | ||
| { | ||
| if (fieldAccess.getReferenceExpr() instanceof RexCorrelVariable) { | ||
| RexCorrelVariable referenceExpr = (RexCorrelVariable) fieldAccess.getReferenceExpr(); | ||
| final RexCorrelVariable encounteredCorrelationId = referenceExpr; | ||
| if (encounteredCorrelationId.id.equals(correlationId)) { | ||
| int sourceIndex = fieldAccess.getField().getIndex(); | ||
| return rexBuilder.makeFieldAccess(map(referenceExpr), mapping.getTarget(sourceIndex)); | ||
| } | ||
| } | ||
| return super.visitFieldAccess(fieldAccess); | ||
| } | ||
|
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| private RexNode map(RexCorrelVariable referenceExpr) | ||
| { | ||
| return rexBuilder.makeCorrel(newCorrelRowType, referenceExpr.id); | ||
| } | ||
| } | ||
|
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| static class RexRewritingRelShuttle extends RelHomogeneousShuttle | ||
| { | ||
| private final RexShuttle rexVisitor; | ||
|
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| RexRewritingRelShuttle(RexShuttle rexVisitor) | ||
| { | ||
| this.rexVisitor = rexVisitor; | ||
| } | ||
|
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| @Override | ||
| public RelNode visit(RelNode other) | ||
| { | ||
| RelNode next = super.visit(other); | ||
| return next.accept(rexVisitor); | ||
| } | ||
| } | ||
| } |
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