org.apache.flink.table.planner.plan.rules.physical.stream.StreamExecSortLimitRule.scala Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of flink-table-planner-blink_2.11 Show documentation
Show all versions of flink-table-planner-blink_2.11 Show documentation
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.rules.physical.stream
import org.apache.flink.table.planner.plan.`trait`.FlinkRelDistribution
import org.apache.flink.table.planner.plan.nodes.FlinkConventions
import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalSort
import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecSortLimit
import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall}
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.convert.ConverterRule
/**
* Rule that matches [[FlinkLogicalSort]] with non-empty sort fields and non-null fetch or offset,
* and converts it to [[StreamExecSortLimit]].
*/
class StreamExecSortLimitRule
extends ConverterRule(
classOf[FlinkLogicalSort],
FlinkConventions.LOGICAL,
FlinkConventions.STREAM_PHYSICAL,
"StreamExecSortLimitRule") {
override def matches(call: RelOptRuleCall): Boolean = {
val sort: FlinkLogicalSort = call.rel(0)
// only matches Sort with non-empty sort fields and non-null fetch
!sort.getCollation.getFieldCollations.isEmpty && (sort.fetch != null || sort.offset != null)
}
override def convert(rel: RelNode): RelNode = {
val sort: FlinkLogicalSort = rel.asInstanceOf[FlinkLogicalSort]
val input = sort.getInput
val requiredTraitSet = input.getTraitSet
.replace(FlinkRelDistribution.SINGLETON)
.replace(FlinkConventions.STREAM_PHYSICAL)
val providedTraitSet = sort.getTraitSet
.replace(FlinkRelDistribution.SINGLETON)
.replace(FlinkConventions.STREAM_PHYSICAL)
val newInput: RelNode = RelOptRule.convert(input, requiredTraitSet)
new StreamExecSortLimit(
rel.getCluster,
providedTraitSet,
newInput,
sort.collation,
sort.offset,
sort.fetch)
}
}
object StreamExecSortLimitRule {
val INSTANCE: RelOptRule = new StreamExecSortLimitRule
}