Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/10630#discussion_r50901898
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1055,6 +1045,22 @@ object ReplaceDistinctWithAggregate extends
Rule[LogicalPlan] {
}
/**
+ * Replaces logical [[Intersect]] operator with a left-semi [[Join]]
operator.
+ * {{{
+ * SELECT a1, a2 FROM Tab1 INTERSECT SELECT b1, b2 FROM Tab2
+ * ==> SELECT DISTINCT a1, a2 FROM Tab1 LEFT SEMI JOIN Tab2 ON a1<=>b1
AND a2<=>b2
+ * }}}
+ */
+object ReplaceIntersectWithSemiJoin extends Rule[LogicalPlan] {
--- End diff --
Yeah, will do it. Actually, I will also implement `INTERSECT ALL` after
this one. Thanks!
---
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 infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
