Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18697#discussion_r136378843
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala
---
@@ -171,6 +171,16 @@ sealed trait Partitioning {
* produced by `A` could have also been produced by `B`.
*/
def guarantees(other: Partitioning): Boolean = this == other
+
+ /**
+ * Returns the partitioning scheme that is valid under restriction to a
given set of output
+ * attributes. If the partitioning is an [[Expression]] then the
attributes that it depends on
+ * must be in the outputSet otherwise the attribute leaks.
+ */
+ def restrict(outputSet: AttributeSet): Partitioning = this match {
--- End diff --
We are refactoring the concept in the PR
https://github.com/apache/spark/pull/19080
Please review that PR first? Thanks!
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