GitHub user goungoun opened a pull request:

    isEmpty in Dataset and its testSuite

    ## What changes were proposed in this pull request?
    This PR adds isEmpty() in DataSet
    ## How was this patch tested?
    Unit tests added
    Please review before opening a 
pull request.

You can merge this pull request into a Git repository by running:

    $ git pull SPARK-23627

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #20800
commit d3fc620e49ae07f6ebc0ee20976c12da49f2e0af
Author: Goun Na <gounna@...>
Date:   2018-03-12T02:57:19Z

    isEmpty in Dataset and its testSuite



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