Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18652#discussion_r127893995
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1912,6 +1913,26 @@ class Analyzer(
nondeterToAttr.get(e).map(_.toAttribute).getOrElse(e)
}.copy(child = newChild)
+ case j: Join if j.condition.isDefined &&
!j.condition.get.deterministic =>
+ j match {
+ // We can push down non-deterministic joining keys.
+ // We can't push down non-deterministic conditions.
+ case ExtractEquiJoinKeys(_, leftKeys, rightKeys, conditions, _,
_)
--- End diff --
Supporting only equi-join does not sound reasonable here. The join
condition can be any predicate.
How about adding a SQLConf flag for controlling it? We can simply pushing
it down no matter whether its semantics are the same or not, for making it
consistent with Hive. By default, turn that flag off.
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