GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/19436
[SQL][WIP] Fix FlatMapGroupsInR's child distribution when grouping
attributes are empty
## What changes were proposed in this pull request?
Looks like `FlatMapGroupsInRExec.requiredChildDistribution` didn't consider
empty grouping attributes.
WIP: Not quite sure if this will cause problem in R side. Add test to see
Jenkins test result.
## How was this patch tested?
Added test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 fix-flatmapinr-distribution
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19436.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 #19436
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commit 6710141767a2df92898af319bc4ef87f9110f911
Author: Liang-Chi Hsieh <vii...@gmail.com>
Date: 2017-10-05T03:08:00Z
Fix FlatMapGroupsInR's child distribution when grouping attributes are
empty.
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