Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/15238#discussion_r80794658
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
---
@@ -191,25 +191,34 @@ object ExtractFiltersAndInnerJoins extends
PredicateHelper {
/**
* A pattern that collects all adjacent unions and returns their children
as a Seq.
+ * If the top union is wrapped in a [[Distinct]], then the [[Distinct]] in
the adjacent unions, if
+ * any, will be eliminated.
*/
object Unions {
- def unapply(plan: LogicalPlan): Option[Seq[LogicalPlan]] = plan match {
- case u: Union => Some(collectUnionChildren(mutable.Stack(u),
Seq.empty[LogicalPlan]))
+ def unapply(plan: LogicalPlan): Option[(Seq[LogicalPlan], Boolean)] =
plan match {
--- End diff --
+1
Probably simpler.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
