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https://issues.apache.org/jira/browse/SPARK-21435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16089455#comment-16089455
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Hyukjin Kwon commented on SPARK-21435:
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Yea, particularly, in this case, many issues are related I believe.

> Empty files should be skipped while write to file
> -------------------------------------------------
>
>                 Key: SPARK-21435
>                 URL: https://issues.apache.org/jira/browse/SPARK-21435
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Li Yuanjian
>            Priority: Minor
>
> Consider of this scenario, source table has many partitions and data files, 
> after the query filter, only a few data write to the destination dir.
> In this case the destination dir or table will have many empty files or files 
> only have schema meta(parquet format), I know we can use coalesce but skip 
> the empty file may be more better in this case.



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