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[FLINK-12173][table] Optimize SELECT DISTINCT
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140 changes: 140 additions & 0 deletions
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...nk/table/planner/plan/rules/physical/stream/StreamLogicalOptimizeSelectDistinctRule.scala
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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.stream | ||
| import org.apache.flink.table.planner.JList | ||
| import org.apache.flink.table.planner.calcite.FlinkTypeFactory | ||
| import org.apache.flink.table.planner.plan.nodes.FlinkConventions | ||
| import org.apache.flink.table.planner.plan.nodes.logical.{FlinkLogicalAggregate, FlinkLogicalCalc, FlinkLogicalJoin, FlinkLogicalRank} | ||
| import org.apache.flink.table.planner.plan.nodes.physical.stream.{StreamPhysicalIntervalJoin, StreamPhysicalRank, StreamPhysicalTemporalSort} | ||
| import org.apache.flink.table.planner.plan.utils.{RankProcessStrategy, RankUtil, WindowJoinUtil} | ||
| import org.apache.flink.table.runtime.operators.rank.{ConstantRankRange, RankType} | ||
| import org.apache.flink.table.types.logical.IntType | ||
|
|
||
| import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall} | ||
| import org.apache.calcite.plan.RelOptRule.{any, operand} | ||
| import org.apache.calcite.rel.`type`.{RelDataType, RelDataTypeField, RelDataTypeFieldImpl, RelDataTypeSystem} | ||
| import org.apache.calcite.rel.{RelCollation, RelCollations, RelFieldCollation} | ||
| import org.apache.calcite.rel.RelNode | ||
| import org.apache.calcite.rel.convert.ConverterRule.Config | ||
| import org.apache.calcite.rel.core.JoinRelType | ||
| import org.apache.calcite.rel.hint.RelHint | ||
| import org.apache.calcite.rel.logical.LogicalProject | ||
| import org.apache.calcite.rex.{RexInputRef, RexNode, RexProgram} | ||
| import org.apache.calcite.util.ImmutableBitSet | ||
|
|
||
| import java.util | ||
| import java.util.Collections | ||
|
|
||
| import scala.collection.convert.ImplicitConversions.`iterable AsScalaIterable` | ||
|
|
||
| /** | ||
| * Rule that matches [[FlinkLogicalAggregate]], and converts it to [[FlinkLogicalRank]] in the case | ||
| * of SELECT DISTINCT queries. | ||
| * | ||
| * e.g. {SELECT DISTINCT a, b, c;} will be converted to [[FlinkLogicalRank]] instead of | ||
| * [[FlinkLogicalAggregate]] in rowtime. | ||
| */ | ||
| class StreamLogicalOptimizeSelectDistinctRule | ||
| extends RelOptRule(operand(classOf[FlinkLogicalAggregate], any)) { | ||
| private val classLoader = Thread.currentThread().getContextClassLoader | ||
| private val typeSystem = RelDataTypeSystem.DEFAULT | ||
| private val typeFactory = new FlinkTypeFactory(classLoader, typeSystem) | ||
| private val intType: RelDataType = | ||
| typeFactory.createFieldTypeFromLogicalType(new IntType(false)) | ||
|
|
||
| override def matches(call: RelOptRuleCall): Boolean = { | ||
| val rel: FlinkLogicalAggregate = call.rel(0) | ||
| // check if it's a SELECT DISTINCT query | ||
| rel.getGroupSet.cardinality() == rel.getRowType.getFieldCount && rel.getAggCallList.isEmpty | ||
| } | ||
|
|
||
| override def onMatch(call: RelOptRuleCall): Unit = { | ||
| val agg: FlinkLogicalAggregate = call.rel(0) | ||
|
|
||
| val input = agg.getInput | ||
| val traitSet = agg.getTraitSet | ||
| val cluster = agg.getCluster | ||
|
|
||
| // Create a list of all group keys | ||
| val groupKeys = agg.getGroupSet | ||
|
|
||
| // Create a projection to select only the fields in the DISTINCT clause | ||
| val projectList: JList[RexNode] = { | ||
| val list = new util.ArrayList[RexNode](groupKeys.cardinality()) | ||
| groupKeys.toList.foreach(i => list.add(RexInputRef.of(i, input.getRowType))) | ||
| list | ||
| } | ||
|
|
||
| // Create the projected row type | ||
| val projectedFields: JList[RelDataTypeField] = { | ||
| val fields = new util.ArrayList[RelDataTypeField](projectList.size()) | ||
| projectList.forEach { | ||
| rexNode => | ||
| val rexInputRef = rexNode.asInstanceOf[RexInputRef] | ||
| fields.add(input.getRowType.getFieldList.get(rexInputRef.getIndex)) | ||
| } | ||
| fields | ||
| } | ||
|
|
||
| // Create the projected row type | ||
| val projectedRowType: RelDataType = typeFactory.createStructType(projectedFields) | ||
|
|
||
| // Create a RelCollation based on all group keys | ||
| val fieldCollations: JList[RelFieldCollation] = { | ||
| val collations = new util.ArrayList[RelFieldCollation](groupKeys.cardinality()) | ||
| groupKeys.foreach { | ||
| key => collations.add(new RelFieldCollation(key, RelFieldCollation.Direction.ASCENDING)) | ||
| } | ||
| collations | ||
| } | ||
| val collation: RelCollation = RelCollations.of(fieldCollations) | ||
|
|
||
| // Create a projection to select only the fields in the DISTINCT clause | ||
| val projection: RelNode = FlinkLogicalCalc.create( | ||
| input, | ||
| RexProgram.create( | ||
| input.getRowType, | ||
| projectList, | ||
| null, | ||
| projectedRowType, | ||
| cluster.getRexBuilder | ||
| )) | ||
|
|
||
| val rank = new FlinkLogicalRank( | ||
| cluster, | ||
| traitSet, | ||
| projection, | ||
| groupKeys, | ||
| collation, | ||
| RankType.ROW_NUMBER, | ||
| new ConstantRankRange(1, 1), // We only want the first row for each group | ||
| new RelDataTypeFieldImpl("rk", projectedRowType.getFieldCount - 1, intType), | ||
| false | ||
| ) | ||
| try RankUtil.canConvertToDeduplicate(rank) | ||
| catch { | ||
| case _: Exception => | ||
| return | ||
| } | ||
| call.transformTo(rank) | ||
| } | ||
| } | ||
|
|
||
| object StreamLogicalOptimizeSelectDistinctRule { | ||
| val INSTANCE = new StreamLogicalOptimizeSelectDistinctRule() | ||
| } |
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