org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalJoin.scala Maven / Gradle / Ivy
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This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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.flink.table.planner.plan.nodes.logical
import org.apache.flink.table.planner.plan.nodes.FlinkConventions
import org.apache.calcite.plan._
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.convert.ConverterRule
import org.apache.calcite.rel.core.{CorrelationId, Join, JoinRelType}
import org.apache.calcite.rel.hint.RelHint
import org.apache.calcite.rel.logical.LogicalJoin
import org.apache.calcite.rel.metadata.RelMetadataQuery
import org.apache.calcite.rex.RexNode
import java.util.Collections
import scala.collection.JavaConversions._
/**
* Sub-class of [[Join]] that is a relational expression
* which combines two relational expressions according to some condition in Flink.
*/
class FlinkLogicalJoin(
cluster: RelOptCluster,
traitSet: RelTraitSet,
left: RelNode,
right: RelNode,
condition: RexNode,
joinType: JoinRelType)
extends Join(cluster, traitSet, Collections.emptyList[RelHint](),
left, right, condition, Set.empty[CorrelationId], joinType)
with FlinkLogicalRel {
override def copy(
traitSet: RelTraitSet,
conditionExpr: RexNode,
left: RelNode,
right: RelNode,
joinType: JoinRelType,
semiJoinDone: Boolean): Join = {
new FlinkLogicalJoin(cluster, traitSet, left, right, conditionExpr, joinType)
}
override def computeSelfCost(planner: RelOptPlanner, mq: RelMetadataQuery): RelOptCost = {
val leftRowCnt = mq.getRowCount(getLeft)
val leftRowSize = mq.getAverageRowSize(getLeft)
val rightRowCnt = mq.getRowCount(getRight)
joinType match {
case JoinRelType.SEMI | JoinRelType.ANTI =>
val rightRowSize = mq.getAverageRowSize(getRight)
val ioCost = (leftRowCnt * leftRowSize) + (rightRowCnt * rightRowSize)
val cpuCost = leftRowCnt + rightRowCnt
val rowCnt = leftRowCnt + rightRowCnt
planner.getCostFactory.makeCost(rowCnt, cpuCost, ioCost)
case _ =>
val cpuCost = leftRowCnt + rightRowCnt
val ioCost = (leftRowCnt * leftRowSize) + rightRowCnt
planner.getCostFactory.makeCost(leftRowCnt, cpuCost, ioCost)
}
}
}
/**
* Support all joins.
*/
private class FlinkLogicalJoinConverter
extends ConverterRule(
classOf[LogicalJoin],
Convention.NONE,
FlinkConventions.LOGICAL,
"FlinkLogicalJoinConverter") {
override def convert(rel: RelNode): RelNode = {
val join = rel.asInstanceOf[LogicalJoin]
val newLeft = RelOptRule.convert(join.getLeft, FlinkConventions.LOGICAL)
val newRight = RelOptRule.convert(join.getRight, FlinkConventions.LOGICAL)
FlinkLogicalJoin.create(newLeft, newRight, join.getCondition, join.getJoinType)
}
}
object FlinkLogicalJoin {
val CONVERTER: ConverterRule = new FlinkLogicalJoinConverter
def create(
left: RelNode,
right: RelNode,
conditionExpr: RexNode,
joinType: JoinRelType): FlinkLogicalJoin = {
val cluster = left.getCluster
val traitSet = cluster.traitSetOf(FlinkConventions.LOGICAL).simplify()
new FlinkLogicalJoin(cluster, traitSet, left, right, conditionExpr, joinType)
}
}