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DRILL-6798: Planner changes to support semi-join.
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48 changes: 48 additions & 0 deletions
48
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillJoin.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| package org.apache.drill.exec.planner.logical; | ||
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| import org.apache.calcite.rel.RelNode; | ||
| import org.apache.calcite.rel.core.JoinRelType; | ||
| import org.apache.calcite.rex.RexNode; | ||
| import org.apache.drill.exec.planner.common.DrillRelNode; | ||
| import java.util.List; | ||
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| /** | ||
| * Interface which needs to be implemented by all the join relation expressions. | ||
| */ | ||
| public interface DrillJoin extends DrillRelNode { | ||
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| /* Columns of left table that are part of join condition */ | ||
| List<Integer> getLeftKeys(); | ||
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| /* Columns of right table that are part of join condition */ | ||
| List<Integer> getRightKeys(); | ||
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| /* JoinType of the join operation*/ | ||
| JoinRelType getJoinType(); | ||
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| /* Join condition of the join relation */ | ||
| RexNode getCondition(); | ||
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| /* Left RelNode of the Join Relation */ | ||
| RelNode getLeft(); | ||
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| /* Right RelNode of the Join Relation */ | ||
| RelNode getRight(); | ||
| } |
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101 changes: 101 additions & 0 deletions
101
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillSemiJoinRel.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| package org.apache.drill.exec.planner.logical; | ||
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| import org.apache.calcite.plan.RelOptCluster; | ||
| import org.apache.calcite.plan.RelTraitSet; | ||
| import org.apache.calcite.rel.RelNode; | ||
| import org.apache.calcite.rel.core.JoinInfo; | ||
| import org.apache.calcite.rel.core.JoinRelType; | ||
| import org.apache.calcite.rel.core.SemiJoin; | ||
| import org.apache.calcite.rex.RexNode; | ||
| import org.apache.calcite.util.ImmutableIntList; | ||
| import org.apache.calcite.util.Pair; | ||
| import org.apache.drill.common.expression.FieldReference; | ||
| import org.apache.drill.common.logical.data.Join; | ||
| import org.apache.drill.common.logical.data.JoinCondition; | ||
| import org.apache.drill.common.logical.data.LogicalOperator; | ||
| import org.apache.drill.common.logical.data.LogicalSemiJoin; | ||
| import org.apache.drill.shaded.guava.com.google.common.collect.Lists; | ||
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| public class DrillSemiJoinRel extends SemiJoin implements DrillJoin, DrillRel { | ||
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| public DrillSemiJoinRel( | ||
| RelOptCluster cluster, | ||
| RelTraitSet traitSet, | ||
| RelNode left, | ||
| RelNode right, | ||
| RexNode condition, | ||
| ImmutableIntList leftKeys, | ||
| ImmutableIntList rightKeys) { | ||
| super(cluster, | ||
| traitSet, | ||
| left, | ||
| right, | ||
| condition, | ||
| leftKeys, | ||
| rightKeys); | ||
| } | ||
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| public static SemiJoin create(RelNode left, RelNode right, RexNode condition, | ||
| ImmutableIntList leftKeys, ImmutableIntList rightKeys) { | ||
| final RelOptCluster cluster = left.getCluster(); | ||
| return new DrillSemiJoinRel(cluster, cluster.traitSetOf(DrillRel.DRILL_LOGICAL), left, | ||
| right, condition, leftKeys, rightKeys); | ||
| } | ||
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| @Override | ||
| public SemiJoin copy(RelTraitSet traitSet, RexNode condition, | ||
| RelNode left, RelNode right, JoinRelType joinType, boolean semiJoinDone) { | ||
| Preconditions.checkArgument(joinType == JoinRelType.INNER); | ||
| final JoinInfo joinInfo = JoinInfo.of(left, right, condition); | ||
| Preconditions.checkArgument(joinInfo.isEqui()); | ||
| return new DrillSemiJoinRel(getCluster(), traitSet, left, right, condition, | ||
| joinInfo.leftKeys, joinInfo.rightKeys); | ||
| } | ||
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| @Override | ||
| public LogicalOperator implement(DrillImplementor implementor) { | ||
| List<String> fields = new ArrayList<>(); | ||
| fields.addAll(getInput(0).getRowType().getFieldNames()); | ||
| fields.addAll(getInput(1).getRowType().getFieldNames()); | ||
| Preconditions.checkArgument(DrillJoinRel.isUnique(fields)); | ||
| final int leftCount = left.getRowType().getFieldCount(); | ||
| final List<String> leftFields = fields.subList(0, leftCount); | ||
| final List<String> rightFields = fields.subList(leftCount, leftCount + right.getRowType().getFieldCount()); | ||
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| final LogicalOperator leftOp = DrillJoinRel.implementInput(implementor, 0, 0, left, this, fields); | ||
| final LogicalOperator rightOp = DrillJoinRel.implementInput(implementor, 1, leftCount, right, this, fields); | ||
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| Join.Builder builder = Join.builder(); | ||
| builder.type(joinType); | ||
| builder.left(leftOp); | ||
| builder.right(rightOp); | ||
| List<JoinCondition> conditions = Lists.newArrayList(); | ||
| for (Pair<Integer, Integer> pair : Pair.zip(leftKeys, rightKeys)) { | ||
| conditions.add(new JoinCondition(DrillJoinRel.EQUALITY_CONDITION, | ||
| new FieldReference(leftFields.get(pair.left)), new FieldReference(rightFields.get(pair.right)))); | ||
| } | ||
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| return new LogicalSemiJoin(leftOp, rightOp, conditions, joinType); | ||
| } | ||
| } |
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