Hyukjin Kwon resolved SPARK-21435.
    Resolution: Duplicate

I am resolving this as a duplicate of SPARK-20065. I believe the fix should be 
essentially in the same place and they describe the similar issues. Please 
reopen this if the fix should be separate or I misunderstood.

> 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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