GitHub user joseph-torres opened a pull request:

    https://github.com/apache/spark/pull/18889

    [SPARK-21587][SS] Added pushdown through watermarks.

    ## What changes were proposed in this pull request?
    
    Filter predicates can be pushed through EventTimeWatermark if they're 
deterministic and do not reference the watermarked attribute.
    Projects can be pushed through EventTimeWatermark if they include the 
watermarked attribute.
    
    This is a copy of PR 18790, which I had to make so I could build the right 
commit history.
    
    ## How was this patch tested?
    
    new unit tests
    
    Please review http://spark.apache.org/contributing.html before opening a 
pull request.


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

    $ git pull https://github.com/joseph-torres/spark SPARK-21587

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

    https://github.com/apache/spark/pull/18889.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 #18889
    
----
commit 9cc8da5dbc5be9b7b663e002097214e3c0720801
Author: Jose Torres <joseph-tor...@databricks.com>
Date:   2017-07-31T22:58:03Z

    Added pushdown below watermarks.

commit 154d34820be73f7d20bf1119fb385940d0ce6455
Author: Jose Torres <joseph-tor...@databricks.com>
Date:   2017-08-01T16:47:32Z

    Push Project, Limit, and Filter through watermark when appropriate.

commit 84575b60609a3efc9824eba96541011a99313a63
Author: Jose Torres <joseph-tor...@databricks.com>
Date:   2017-08-07T20:50:29Z

    Remove pushdown limit through watermark.

----


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