GitHub user jiangxb1987 opened a pull request:
https://github.com/apache/spark/pull/20426
[SPARK-23207][SQL][FOLLOW-UP] Don't perform local sort for
DataFrame.repartition(1)
## What changes were proposed in this pull request?
In `ShuffleExchangeExec`, we don't need to insert extra local sort before
round-robin partitioning, if the new partitioning has only 1 partition, because
under that case all output rows go to the same partition.
## How was this patch tested?
The existing test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jiangxb1987/spark repartition1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20426.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 #20426
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commit 2c9ee7f8fd22ffdff250da9ae2709dfbcaea7342
Author: Xingbo Jiang <xingbo.jiang@...>
Date: 2018-01-29T18:49:06Z
improve DataFrame.repartition(1).
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