GitHub user pwoody opened a pull request:
https://github.com/apache/spark/pull/18542
[SPARK-21317][SQL] Avoid sorting on bucket expression if data is already
bucketed
## What changes were proposed in this pull request?
When saving bucketed data, each task will sort it's partition by the
partition id produce by the HashPartitioning of the bucket column. If the input
data is already partitioned by the bucket partitioning, then this value will be
constant, making the sort unnecessary.
## How was this patch tested?
Manual tests + debugging. Not sure what the easiest way to plug into
verifying the plan inside the writer would have a sort or not.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/pwoody/spark SPARK-21317
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18542.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 #18542
----
commit 557837990dcfb17e19480bc3ea80ac685a8b3c32
Author: Patrick Woody <pwo...@palantir.com>
Date: 2017-07-05T13:58:38Z
Avoid sort on bucket expression if data is already bucketed
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