GitHub user mgaido91 opened a pull request:
https://github.com/apache/spark/pull/19870
[SPARK-22665][SQL] Avoid repartitioning with empty list of expressions
## What changes were proposed in this pull request?
Repartitioning by empty set of expressions is currently possible, even
though it is a case which is not handled properly. Indeed, in `HashExpression`
there is a check to avoid to run it on an empty set, but this check is not
performed while repartitioning.
Thus, the PR adds a check to avoid this wrong situation.
## How was this patch tested?
added UT
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mgaido91/spark SPARK-22665
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19870.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 #19870
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commit fdf10b36cbc746e57cb0b8c2f79646db9dd06964
Author: Marco Gaido <marcogaid...@gmail.com>
Date: 2017-12-03T19:40:01Z
[SPARK-22665][SQL] Avoid repartitioning with empty list of expressions
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