Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18652#discussion_r127895419
--- 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.
--- End diff --
One row in side A could match multiple rows in side B. The join conditions
could be also evaluated multiple times for the same row in side A, right? Then,
if we push it down to the side A, it could also break the number of `rand`
calls, right?
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