GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/19050
[SPARK-21835][SQL][WIP] RewritePredicateSubquery should not produce
unresolved query plans
## What changes were proposed in this pull request?
`RewritePredicateSubquery` rewrites correlated subquery to join operations.
`RewritePredicateSubquery` can produce unresolved query plans due to
conflicting attributes. The unresolved query plans will fail structural
integrity check. We should deduplicate the conflicting attributes in the
rewritten join.
## How was this patch tested?
WIP to add test later
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-21835
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19050.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #19050
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commit edb6271807a1ad8704f5d1715592af79a7c0b63a
Author: Liang-Chi Hsieh <[email protected]>
Date: 2017-08-25T05:40:17Z
Dedup join after RewritePredicateSubquery.
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