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
    
----
commit 9abcd75474f188d7b9f4ed4caab6bb8e98c1da4d
Author: Marius van Niekerk <marius.vanniek...@maxpoint.com>
Date:   2016-11-07T22:06:38Z

    Implement custom coalesce

commit bb7f9b0ab06ec0be8666e14846e19fe0c28e5143
Author: Takeshi Yamamuro <yamam...@apache.org>
Date:   2017-08-06T14:44:51Z

    Add more fixes

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