GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/22239
[SPARK-19355][SQL][Followup] Remove the child.outputPartitioning check
## What changes were proposed in this pull request?
This is based on the discussion
https://github.com/apache/spark/pull/16677/files#r212805327.
As SQL standard doesn't mandate that a nested order by followed by a limit
has to respect that ordering clause, this patch removes the
`child.outputPartitioning` check.
## How was this patch tested?
Unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1
improve-global-limit-parallelism-followup
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22239.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 #22239
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commit b57634bea6213b67eae896489e913fac685d5a75
Author: Liang-Chi Hsieh <viirya@...>
Date: 2018-08-27T00:26:06Z
Remove the child.outputPartitioning check.
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