cloud-fan commented on a change in pull request #33541: URL: https://github.com/apache/spark/pull/33541#discussion_r677967739
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AQEUtils.scala ########## @@ -0,0 +1,62 @@ +/* + * 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.spark.sql.execution.adaptive + +import org.apache.spark.sql.catalyst.plans.physical.{Distribution, HashClusteredDistribution, HashPartitioning, OrderedDistribution, RangePartitioning, UnspecifiedDistribution} +import org.apache.spark.sql.execution.{CollectMetricsExec, FilterExec, ProjectExec, SortExec, SparkPlan} +import org.apache.spark.sql.execution.exchange.{REPARTITION_BY_COL, ShuffleExchangeExec} + +object AQEUtils { + + // Analyze the given plan and calculate the required distribution of this plan w.r.t. the + // user-specified repartition. + def getRequiredDistribution(p: SparkPlan): Option[Distribution] = p match { + // user-specified repartition is only effective when it's the root node, or under + // Project/Filter/LocalSort/CollectMetrics. + case s: ShuffleExchangeExec if s.shuffleOrigin == REPARTITION_BY_COL => + s.outputPartitioning match { + case h: HashPartitioning => Some(HashClusteredDistribution(h.expressions)) + // Note: Ideally we need a special version of `OrderedDistribution` that requires an + // exact match of the `RangePartitioning`, otherwise `RangePartitioning(a, b)` can + // satisfy `OrderedDistribution(a, b, c)`. But we are fine in AQE as AQE rules can only + // change `RangePartitioning` to a totally different partitioning, so + // `OrderedDistribution` can do the job and avoid changing the final output partitioning. + case r: RangePartitioning => Some(OrderedDistribution(r.ordering)) + case other => throw new IllegalStateException( + "Unexpected partitioning for REPARTITION_BY_COL: " + other) + } + case f: FilterExec => getRequiredDistribution(f.child) + case s: SortExec if !s.global => getRequiredDistribution(s.child) + case c: CollectMetricsExec => getRequiredDistribution(c.child) Review comment: `Partitioning` does not have the "semantic equals" concept. This will be the first place to check the equality of 2 partitionings, which I think is risky. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
