Github user sathiyapk commented on a diff in the pull request: https://github.com/apache/spark/pull/19451#discussion_r143289752 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -1242,6 +1243,53 @@ object ReplaceIntersectWithSemiJoin extends Rule[LogicalPlan] { } /** + * If one or both of the datasets in the logical [[Except]] operator are purely transformed using + * [[Filter]], this rule will replace logical [[Except]] operator with a [[Filter]] operator by + * flipping the filter condition of the right child. + * {{{ + * SELECT a1, a2 FROM Tab1 WHERE a2 = 12 EXCEPT SELECT a1, a2 FROM Tab1 WHERE a1 = 5 + * ==> SELECT a1, a2 FROM Tab1 WHERE a2 = 12 AND a1 <> 5 --- End diff -- @gatorsmile Thanks for the comment. Sorry i didn't pay attention, i'll update the query example. But the code produces the correct behaviour of the Except operator. Do you have any comment in the code?
--- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org