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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.api.TableException
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.FlinkLogicalRank
import org.apache.flink.table.planner.plan.nodes.physical.batch.BatchPhysicalRank
import org.apache.flink.table.planner.plan.utils.FlinkRelOptUtil
import org.apache.flink.table.runtime.operators.rank.{ConstantRankRange, RankType}
import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall}
import org.apache.calcite.rel.convert.ConverterRule
import org.apache.calcite.rel.{RelCollations, RelNode}
import scala.collection.JavaConversions._
/**
* Rule that matches [[FlinkLogicalRank]] with rank function and constant rank range,
* and converts it to
* {{{
* BatchPhysicalRank (global)
* +- BatchPhysicalExchange (singleton if partition keys is empty, else hash)
* +- BatchPhysicalRank (local)
* +- input of rank
* }}}
*/
class BatchPhysicalRankRule
extends ConverterRule(
classOf[FlinkLogicalRank],
FlinkConventions.LOGICAL,
FlinkConventions.BATCH_PHYSICAL,
"BatchPhysicalRankRule") {
override def matches(call: RelOptRuleCall): Boolean = {
val rank: FlinkLogicalRank = call.rel(0)
// Only support rank() now
rank.rankType == RankType.RANK && rank.rankRange.isInstanceOf[ConstantRankRange]
}
def convert(rel: RelNode): RelNode = {
val rank = rel.asInstanceOf[FlinkLogicalRank]
val (_, rankEnd) = rank.rankRange match {
case r: ConstantRankRange => (r.getRankStart, r.getRankEnd)
case o => throw new TableException(s"$o is not supported now")
}
val cluster = rel.getCluster
val emptyTraits = cluster.getPlanner.emptyTraitSet().replace(FlinkConventions.BATCH_PHYSICAL)
val sortFieldCollations = rank.partitionKey.asList()
.map(FlinkRelOptUtil.ofRelFieldCollation(_)) ++ rank.orderKey.getFieldCollations
val sortCollation = RelCollations.of(sortFieldCollations: _*)
val localRequiredTraitSet = emptyTraits.replace(sortCollation)
val newLocalInput = RelOptRule.convert(rank.getInput, localRequiredTraitSet)
// create local BatchPhysicalRank
val localRankRange = new ConstantRankRange(1, rankEnd) // local rank always start from 1
val localRank = new BatchPhysicalRank(
cluster,
emptyTraits,
newLocalInput,
rank.partitionKey,
rank.orderKey,
rank.rankType,
localRankRange,
rank.rankNumberType,
outputRankNumber = false,
isGlobal = false
)
// create local BatchPhysicalRank
val globalRequiredDistribution = if (rank.partitionKey.isEmpty) {
FlinkRelDistribution.SINGLETON
} else {
FlinkRelDistribution.hash(rank.partitionKey.toList, requireStrict = false)
}
val globalRequiredTraitSet = emptyTraits
.replace(globalRequiredDistribution)
.replace(sortCollation)
// require SINGLETON or HASH exchange
val newGlobalInput = RelOptRule.convert(localRank, globalRequiredTraitSet)
val globalRank = new BatchPhysicalRank(
cluster,
emptyTraits,
newGlobalInput,
rank.partitionKey,
rank.orderKey,
rank.rankType,
rank.rankRange,
rank.rankNumberType,
rank.outputRankNumber,
isGlobal = true
)
globalRank
}
}
object BatchPhysicalRankRule {
val INSTANCE: RelOptRule = new BatchPhysicalRankRule
}