Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/10844#discussion_r51068566 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala --- @@ -146,6 +172,26 @@ case class Union(children: Seq[LogicalPlan]) extends LogicalPlan { val sizeInBytes = children.map(_.statistics.sizeInBytes).sum Statistics(sizeInBytes = sizeInBytes) } + + override def extractConstraintsFromChild(child: QueryPlan[LogicalPlan]): Set[Expression] = { + child.constraints.filter(_.references.subsetOf(child.outputSet)) + } + + def rewriteConstraints( + planA: LogicalPlan, + planB: LogicalPlan, + constraints: Set[Expression]): Set[Expression] = { + require(planA.output.size == planB.output.size) + val attributeRewrites = AttributeMap(planB.output.zip(planA.output)) + constraints.map(_ transform { + case a: Attribute => attributeRewrites(a) + }) + } + + override def constraints: Set[Expression] = { + children.map(child => rewriteConstraints(children.head, child, + extractConstraintsFromChild(child))).reduce(_ intersect _) --- End diff -- same style nit
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