org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalUnion.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.{SetOp, Union}
import org.apache.calcite.rel.logical.LogicalUnion
import org.apache.calcite.rel.metadata.RelMetadataQuery
import java.util.{List => JList}
import scala.collection.JavaConversions._
/**
* Sub-class of [[Union]] that is a relational expression
* which returns the union of the rows of its inputs in Flink.
*/
class FlinkLogicalUnion(
cluster: RelOptCluster,
traitSet: RelTraitSet,
inputs: JList[RelNode],
all: Boolean)
extends Union(cluster, traitSet, inputs, all)
with FlinkLogicalRel {
override def copy(traitSet: RelTraitSet, inputs: JList[RelNode], all: Boolean): SetOp = {
new FlinkLogicalUnion(cluster, traitSet, inputs, all)
}
override def computeSelfCost(planner: RelOptPlanner, mq: RelMetadataQuery): RelOptCost = {
val rowCnt = this.getInputs.foldLeft(0D) {
(rows, input) =>
val inputRowCount = mq.getRowCount(input)
rows + inputRowCount
}
planner.getCostFactory.makeCost(rowCnt, 0, 0)
}
}
private class FlinkLogicalUnionConverter
extends ConverterRule(
classOf[LogicalUnion],
Convention.NONE,
FlinkConventions.LOGICAL,
"FlinkLogicalUnionConverter") {
/**
* Only translate UNION ALL.
*/
override def matches(call: RelOptRuleCall): Boolean = {
val union: LogicalUnion = call.rel(0)
union.all
}
override def convert(rel: RelNode): RelNode = {
val union = rel.asInstanceOf[LogicalUnion]
val newInputs = union.getInputs.map {
input => RelOptRule.convert(input, FlinkConventions.LOGICAL)
}
FlinkLogicalUnion.create(newInputs, union.all)
}
}
object FlinkLogicalUnion {
val CONVERTER: ConverterRule = new FlinkLogicalUnionConverter()
def create(inputs: JList[RelNode], all: Boolean): FlinkLogicalUnion = {
val cluster = inputs.get(0).getCluster
val traitSet = cluster.traitSetOf(FlinkConventions.LOGICAL).simplify()
new FlinkLogicalUnion(cluster, traitSet, inputs, all)
}
}