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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.nodes.physical.batch.{BatchPhysicalExchange, BatchPhysicalExpand, BatchPhysicalHashAggregate}
import org.apache.calcite.plan.RelOptRule.{any, operand}
import org.apache.calcite.plan.RelOptRuleCall
/**
* An [[EnforceLocalAggRuleBase]] that matches [[BatchPhysicalHashAggregate]]
*
* for example: select count(*) from t group by rollup (a, b)
* The physical plan
*
* {{{
* HashAggregate(isMerge=[false], groupBy=[a, b, $e], select=[a, b, $e, COUNT(*)])
* +- Exchange(distribution=[hash[a, b, $e]])
* +- Expand(projects=[{a=[$0], b=[$1], $e=[0]},
* {a=[$0], b=[null], $e=[1]},
* {a=[null], b=[null], $e=[3]}])
* }}}
*
* will be rewritten to
*
* {{{
* HashAggregate(isMerge=[true], groupBy=[a, b, $e], select=[a, b, $e, Final_COUNT(count1$0)])
* +- Exchange(distribution=[hash[a, b, $e]])
* +- LocalHashAggregate(groupBy=[a, b, $e], select=[a, b, $e, Partial_COUNT(*) AS count1$0]
* +- Expand(projects=[{a=[$0], b=[$1], $e=[0]},
* {a=[$0], b=[null], $e=[1]},
* {a=[null], b=[null], $e=[3]}])
* }}}
*/
class EnforceLocalHashAggRule extends EnforceLocalAggRuleBase(
operand(classOf[BatchPhysicalHashAggregate],
operand(classOf[BatchPhysicalExchange],
operand(classOf[BatchPhysicalExpand], any))),
"EnforceLocalHashAggRule") {
override def matches(call: RelOptRuleCall): Boolean = {
val agg: BatchPhysicalHashAggregate = call.rel(0)
val expand: BatchPhysicalExpand = call.rel(2)
val enableTwoPhaseAgg = isTwoPhaseAggEnabled(agg)
val grouping = agg.grouping
val constantShuffleKey = hasConstantShuffleKey(grouping, expand)
grouping.nonEmpty && enableTwoPhaseAgg && constantShuffleKey
}
override def onMatch(call: RelOptRuleCall): Unit = {
val agg: BatchPhysicalHashAggregate = call.rel(0)
val expand: BatchPhysicalExpand = call.rel(2)
val localAgg = createLocalAgg(agg, expand)
val exchange = createExchange(agg, localAgg)
val globalAgg = createGlobalAgg(agg, exchange)
call.transformTo(globalAgg)
}
}
object EnforceLocalHashAggRule {
val INSTANCE = new EnforceLocalHashAggRule
}