Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/837#discussion_r13522951
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
---
@@ -119,6 +119,11 @@ object HashFilteredJoin extends Logging with
PredicateHelper {
case FilteredOperation(predicates, join @ Join(left, right, Inner,
condition)) =>
logger.debug(s"Considering hash inner join on: ${predicates ++
condition}")
splitPredicates(predicates ++ condition, join)
+ // All predicates can be evaluated for left semi join (those that are
in the WHERE
+ // clause can only from left table, so they can all be pushed down.)
--- End diff --
Yes, I think LEFT SEMI JOIN would not suffer by pushing down predicates.
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