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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.
*/
package org.apache.flink.table.planner.plan.rules.physical.batch
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.batch.BatchPhysicalSortLimit
import org.apache.flink.table.planner.plan.utils.SortUtil
import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall}
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.convert.ConverterRule
import org.apache.calcite.sql.`type`.SqlTypeName
/**
* Rule that matches [[FlinkLogicalSort]] with non-empty sort fields and non-null fetch or offset,
* and converts it to
* {{{
* BatchPhysicalSortLimit (global)
* +- BatchPhysicalExchange (singleton)
* +- BatchPhysicalSortLimit (local)
* +- input of sort
* }}}
* when fetch is not null, or
* {{{
* BatchPhysicalSortLimit (global)
* +- BatchPhysicalExchange (singleton)
* +- input of sort
* }}}
* when fetch is null
*/
class BatchPhysicalSortLimitRule
extends ConverterRule(
classOf[FlinkLogicalSort],
FlinkConventions.LOGICAL,
FlinkConventions.BATCH_PHYSICAL,
"BatchPhysicalSortLimitRule") {
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 = rel.asInstanceOf[FlinkLogicalSort]
// create local BatchPhysicalSortLimit
val localRequiredTrait = sort.getInput.getTraitSet.replace(FlinkConventions.BATCH_PHYSICAL)
val localInput = RelOptRule.convert(sort.getInput, localRequiredTrait)
// if fetch is null, there is no need to create local BatchPhysicalSortLimit
val inputOfExchange = if (sort.fetch != null) {
val limit = SortUtil.getLimitEnd(sort.offset, sort.fetch)
val rexBuilder = sort.getCluster.getRexBuilder
val intType = rexBuilder.getTypeFactory.createSqlType(SqlTypeName.INTEGER)
val providedLocalTraitSet = localRequiredTrait.replace(sort.getCollation)
// for local BatchPhysicalSortLimit, offset is always 0, and fetch is `limit`
new BatchPhysicalSortLimit(
rel.getCluster,
providedLocalTraitSet,
localInput,
sort.getCollation,
rexBuilder.makeLiteral(0, intType, true),
rexBuilder.makeLiteral(limit, intType, true),
false)
} else {
localInput
}
// require SINGLETON exchange
val requiredTrait = rel.getCluster.getPlanner.emptyTraitSet()
.replace(FlinkConventions.BATCH_PHYSICAL)
.replace(FlinkRelDistribution.SINGLETON)
val newInput = RelOptRule.convert(inputOfExchange, requiredTrait)
// create global BatchPhysicalSortLimit
val providedGlobalTraitSet = requiredTrait.replace(sort.getCollation)
new BatchPhysicalSortLimit(
rel.getCluster,
providedGlobalTraitSet,
newInput,
sort.getCollation,
sort.offset,
sort.fetch,
true
)
}
}
object BatchPhysicalSortLimitRule {
val INSTANCE: RelOptRule = new BatchPhysicalSortLimitRule
}