GitHub user xuanyuanking opened a pull request:

    https://github.com/apache/spark/pull/18650

    [SPARK-21435][SQL] Empty files should be skipped while write to file

    ## What changes were proposed in this pull request?
    
    Add EmptyDirectoryWriteTask for empty task while writing files.
    
    ## How was this patch tested?
    
    Add new test in `FileFormatWriterSuite `

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

    $ git pull https://github.com/xuanyuanking/spark SPARK-21435

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

    https://github.com/apache/spark/pull/18650.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 #18650
    
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commit ff92ba3ae3abaae0d8ce8bb8c08465f43c14906f
Author: xuanyuanking <xyliyuanj...@gmail.com>
Date:   2017-07-17T07:38:56Z

    empty files should be skipped while write to file

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