org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalCorrelate.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.{Convention, RelOptCluster, RelOptRule, RelTraitSet}
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.convert.ConverterRule
import org.apache.calcite.rel.core.{Correlate, CorrelationId, JoinRelType}
import org.apache.calcite.rel.logical.LogicalCorrelate
import org.apache.calcite.util.ImmutableBitSet
/**
* Sub-class of [[Correlate]] that is a relational operator
* which performs nested-loop joins in Flink.
*/
class FlinkLogicalCorrelate(
cluster: RelOptCluster,
traitSet: RelTraitSet,
left: RelNode,
right: RelNode,
correlationId: CorrelationId,
requiredColumns: ImmutableBitSet,
joinType: JoinRelType)
extends Correlate(cluster, traitSet, left, right, correlationId, requiredColumns, joinType)
with FlinkLogicalRel {
override def copy(
traitSet: RelTraitSet,
left: RelNode,
right: RelNode,
correlationId: CorrelationId,
requiredColumns: ImmutableBitSet,
joinType: JoinRelType): Correlate = {
new FlinkLogicalCorrelate(
cluster,
traitSet,
left,
right,
correlationId,
requiredColumns,
joinType)
}
}
class FlinkLogicalCorrelateConverter
extends ConverterRule(
classOf[LogicalCorrelate],
Convention.NONE,
FlinkConventions.LOGICAL,
"FlinkLogicalCorrelateConverter") {
override def convert(rel: RelNode): RelNode = {
val correlate = rel.asInstanceOf[LogicalCorrelate]
val newLeft = RelOptRule.convert(correlate.getLeft, FlinkConventions.LOGICAL)
val newRight = RelOptRule.convert(correlate.getRight, FlinkConventions.LOGICAL)
FlinkLogicalCorrelate.create(
newLeft,
newRight,
correlate.getCorrelationId,
correlate.getRequiredColumns,
correlate.getJoinType)
}
}
object FlinkLogicalCorrelate {
val CONVERTER: ConverterRule = new FlinkLogicalCorrelateConverter()
def create(
left: RelNode,
right: RelNode,
correlationId: CorrelationId,
requiredColumns: ImmutableBitSet,
joinType: JoinRelType): FlinkLogicalCorrelate = {
val cluster = left.getCluster
val traitSet = cluster.traitSetOf(FlinkConventions.LOGICAL).simplify()
new FlinkLogicalCorrelate(
cluster, traitSet, left, right, correlationId, requiredColumns, joinType)
}
}