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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