Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22957#discussion_r238626367 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala --- @@ -145,9 +145,14 @@ case class EnsureRequirements(conf: SQLConf) extends Rule[SparkPlan] { assert(requiredChildDistributions.length == children.length) assert(requiredChildOrderings.length == children.length) + val aliasMap = AttributeMap[Expression](children.flatMap(_.expressions.collect { + case a: Alias => (a.toAttribute, a) + })) + // Ensure that the operator's children satisfy their output distribution requirements. children = children.zip(requiredChildDistributions).map { - case (child, distribution) if child.outputPartitioning.satisfies(distribution) => + case (child, distribution) if child.outputPartitioning.satisfies( + distribution.mapExpressions(replaceAlias(_, aliasMap))) => --- End diff -- for example, `relation[a, b]`'s output partitioning is `[hash partition a, hash partition b]`, and `Project(a as c, b, relation)`'s output partitioning should be `[hash partition c, hash partition b]`. What do you mean by `But ProjectExec.outputPartitioning cannot contain a reference to the aliases`?
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