Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/20670#discussion_r170529062 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/QueryPlanConstraints.scala --- @@ -29,12 +29,26 @@ trait QueryPlanConstraints { self: LogicalPlan => */ lazy val constraints: ExpressionSet = { if (conf.constraintPropagationEnabled) { + var relevantOutPutSet: AttributeSet = outputSet + constraints.foreach { + case eq @ EqualTo(l: Attribute, r: Attribute) => + if (l.references.subsetOf(relevantOutPutSet) + && !r.references.subsetOf(relevantOutPutSet)) { + relevantOutPutSet = relevantOutPutSet.++(r.references) --- End diff -- Use ` ++ ` syntax, rather than write it as a method invocation.
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