Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10630#issuecomment-170052294
The latest update is for resolving the ambiguous attributes, which could
trigger invalid predicate pushdown by the Optimizer rule
`PushPredicateThroughJoin`. The solution is the same as what we are doing for
self join in analyzer.
Thank you!
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