GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/18861
[SPARK-19426][SQL] Custom coalescer for Dataset
## What changes were proposed in this pull request?
This pr added a new API for `coalesce` in `Dataset`; users can specify the
custom coalescer which reduces an input Dataset into fewer partitions. This
coalescer implementation is the same with the one in `RDD#coalesce` added in
#11865 (SPARK-14042).
This is the rework of #16766.
## How was this patch tested?
Added tests in `DatasetSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark pr16766
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18861.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 #18861
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commit 9abcd75474f188d7b9f4ed4caab6bb8e98c1da4d
Author: Marius van Niekerk <[email protected]>
Date: 2016-11-07T22:06:38Z
Implement custom coalesce
commit bb7f9b0ab06ec0be8666e14846e19fe0c28e5143
Author: Takeshi Yamamuro <[email protected]>
Date: 2017-08-06T14:44:51Z
Add more fixes
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