Github user nsyca commented on a diff in the pull request:
https://github.com/apache/spark/pull/15763#discussion_r86790230
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1044,6 +1044,34 @@ class Analyzer(
failOnOuterReference(p)
p
}
+
+ // SPARK-17348
+ // Looking for a potential incorrect result case.
+ // When a correlated predicate is a non-equality predicate
+ // it must be placed at the immediate child operator.
+ // Otherwise, the pull up of the correlated predicate
+ // will generate a plan with a different semantics
+ // which could return incorrect result.
+ var continue : Boolean = true
--- End diff --
@rxin, Shall we continue the discussion of the general algorithm to resolve
the correlated subquery issue in a new thread? Would you be interested in
putting this item into 2.2?
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