aokolnychyi commented on a change in pull request #31083: URL: https://github.com/apache/spark/pull/31083#discussion_r553874110
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DistributionAndOrderingUtils.scala ########## @@ -0,0 +1,110 @@ +/* + * 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.datasources.v2 + +import org.apache.spark.sql.{catalyst, AnalysisException} +import org.apache.spark.sql.catalyst.analysis.Resolver +import org.apache.spark.sql.catalyst.expressions.{NamedExpression, SortOrder} +import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, RepartitionByExpression, Sort} +import org.apache.spark.sql.connector.distributions.{ClusteredDistribution, OrderedDistribution, UnspecifiedDistribution} +import org.apache.spark.sql.connector.expressions.{Expression, FieldReference, IdentityTransform, NullOrdering, SortDirection, SortValue} +import org.apache.spark.sql.connector.write.{RequiresDistributionAndOrdering, Write} +import org.apache.spark.sql.internal.SQLConf + +object DistributionAndOrderingUtils { + + def prepareQuery(write: Write, query: LogicalPlan, conf: SQLConf): LogicalPlan = write match { + case write: RequiresDistributionAndOrdering => + val resolver = conf.resolver + + val distribution = write.requiredDistribution match { + case d: OrderedDistribution => + d.ordering.map(e => toCatalyst(e, query, resolver)) + case d: ClusteredDistribution => + d.clustering.map(e => toCatalyst(e, query, resolver)) + case _: UnspecifiedDistribution => + Array.empty[catalyst.expressions.Expression] + } + + val queryWithDistribution = if (distribution.nonEmpty) { + val numShufflePartitions = conf.numShufflePartitions + // the conversion to catalyst expressions above produces SortOrder expressions + // for OrderedDistribution and generic expressions for ClusteredDistribution + // this allows RepartitionByExpression to pick either range or hash partitioning + RepartitionByExpression(distribution, query, numShufflePartitions) + } else { + query + } + + val ordering = write.requiredOrdering.toSeq + .map(e => toCatalyst(e, query, resolver)) + .asInstanceOf[Seq[catalyst.expressions.SortOrder]] + + val queryWithDistributionAndOrdering = if (ordering.nonEmpty) { + Sort(ordering, global = false, queryWithDistribution) + } else { + queryWithDistribution + } + + queryWithDistributionAndOrdering + + case _ => + query + } + + private def toCatalyst( + expr: Expression, + query: LogicalPlan, + resolver: Resolver): catalyst.expressions.Expression = { + + // we cannot perform the resolution in the analyzer since we need to optimize expressions + // in nodes like OverwriteByExpression before constructing a logical write + def resolve(ref: FieldReference): NamedExpression = { + query.resolve(ref.parts, resolver) match { + case Some(attr) => attr + case None => throw new AnalysisException(s"Cannot resolve '$ref' using ${query.output}") + } + } + + expr match { + case SortValue(child, direction, nullOrdering) => + val catalystChild = toCatalyst(child, query, resolver) + SortOrder(catalystChild, toCatalyst(direction), toCatalyst(nullOrdering), Seq.empty) + case IdentityTransform(ref) => Review comment: We cannot map other transforms to valid Catalyst expressions as Spark is not capable of resolving data source transforms. We need a function catalog for that. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
