Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/15763#discussion_r86659812 --- 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 -- Well there is also this http://www.btw-2015.de/res/proceedings/Hauptband/Wiss/Neumann-Unnesting_Arbitrary_Querie.pdf
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