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[FLINK-3482] implement union translation
- implement custom JoinUnionTransposeRules because Calcite's only match with LogicalUnion This closes #1715
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110 changes: 110 additions & 0 deletions
110
...ain/scala/org/apache/flink/api/table/plan/rules/logical/FlinkJoinUnionTransposeRule.scala
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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.flink.api.table.plan.rules.logical | ||
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| import org.apache.calcite.plan.RelOptRule.{any, operand, convert => convertTrait} | ||
| import org.apache.calcite.plan.RelOptRule | ||
| import org.apache.calcite.plan.RelOptRuleOperand | ||
| import org.apache.calcite.plan.RelOptRuleCall | ||
| import org.apache.calcite.rel.RelNode | ||
| import java.util.ArrayList | ||
| import scala.collection.JavaConversions._ | ||
| import org.apache.calcite.rel.logical.LogicalJoin | ||
| import org.apache.calcite.rel.logical.LogicalUnion | ||
| import org.apache.calcite.rel.core.Join | ||
| import org.apache.calcite.rel.core.Union | ||
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| /** | ||
| * This rule is a copy of Calcite's JoinUnionTransposeRule. | ||
| * Calcite's implementation checks whether one of the operands is a LogicalUnion, | ||
| * which fails in our case, when it matches with a FlinkUnion. | ||
| * This rule changes this check to match Union, instead of LogicalUnion only. | ||
| * The rest of the rule's logic has not been changed. | ||
| */ | ||
| class FlinkJoinUnionTransposeRule( | ||
| operand: RelOptRuleOperand, | ||
| description: String) extends RelOptRule(operand, description) { | ||
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| override def onMatch(call: RelOptRuleCall): Unit = { | ||
| val join = call.rel(0).asInstanceOf[Join] | ||
| val (unionRel: Union, otherInput: RelNode, unionOnLeft: Boolean) = { | ||
| if (call.rel(1).isInstanceOf[Union]) { | ||
| (call.rel(1).asInstanceOf[Union], call.rel(2).asInstanceOf[RelNode], true) | ||
| } | ||
| else { | ||
| (call.rel(2).asInstanceOf[Union], call.rel(1).asInstanceOf[RelNode], false) | ||
| } | ||
| } | ||
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||
| if (!unionRel.all) { | ||
| return | ||
| } | ||
| if (!join.getVariablesStopped.isEmpty) { | ||
| return | ||
| } | ||
| // The UNION ALL cannot be on the null generating side | ||
| // of an outer join (otherwise we might generate incorrect | ||
| // rows for the other side for join keys which lack a match | ||
| // in one or both branches of the union) | ||
| if (unionOnLeft) { | ||
| if (join.getJoinType.generatesNullsOnLeft) { | ||
| return | ||
| } | ||
| } | ||
| else { | ||
| if (join.getJoinType.generatesNullsOnRight) { | ||
| return | ||
| } | ||
| } | ||
| val newUnionInputs = new ArrayList[RelNode] | ||
| for (input <- unionRel.getInputs) { | ||
| val (joinLeft: RelNode, joinRight: RelNode) = { | ||
| if (unionOnLeft) { | ||
| (input, otherInput) | ||
| } | ||
| else { | ||
| (otherInput, input) | ||
| } | ||
| } | ||
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| newUnionInputs.add( | ||
| join.copy( | ||
| join.getTraitSet, | ||
| join.getCondition, | ||
| joinLeft, | ||
| joinRight, | ||
| join.getJoinType, | ||
| join.isSemiJoinDone)) | ||
| } | ||
| val newUnionRel = unionRel.copy(unionRel.getTraitSet, newUnionInputs, true) | ||
| call.transformTo(newUnionRel) | ||
| } | ||
| } | ||
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| object FlinkJoinUnionTransposeRule { | ||
| val LEFT_UNION = new FlinkJoinUnionTransposeRule( | ||
| operand(classOf[LogicalJoin], operand(classOf[LogicalUnion], any), | ||
| operand(classOf[RelNode], any)), | ||
| "JoinUnionTransposeRule(Union-Other)") | ||
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| val RIGHT_UNION = new FlinkJoinUnionTransposeRule( | ||
| operand(classOf[LogicalJoin], operand(classOf[RelNode], any), | ||
| operand(classOf[LogicalUnion], any)), | ||
| "JoinUnionTransposeRule(Other-Union)") | ||
| } |
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