Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/6853#discussion_r33536357 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala --- @@ -121,6 +122,17 @@ trait CheckAnalysis { case _ => // Analysis successful! } + + // Special handling for cases when self-join introduce duplicate expression ids. + case j @ Join(left, right, _, _) if left.outputSet.intersect(right.outputSet).nonEmpty => --- End diff -- this is not reachable according to the compiler. @smola can you submit a fix for this? thanks.
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