GitHub user KevinZwx opened a pull request:

    https://github.com/apache/spark/pull/18903

    [SPARK-21590][SS]Window start time should support negative values

    ## What changes were proposed in this pull request?
    
    Remove the non-negative checks of window start time to make window support 
negative start time, and add a check to guarantee the absolute value of start 
time is less than slide duration.
    
    ## How was this patch tested?
    
    New unit tests.


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

    $ git pull https://github.com/KevinZwx/spark dev

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

    https://github.com/apache/spark/pull/18903.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 #18903
    
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commit 2073be263e31ba0a957b7ffa2bec2cafe40011d2
Author: HanShuliang <kevinzwx1...@gmail.com>
Date:   2017-08-10T06:46:04Z

    [SPARK-21590][SS]Window start time should support negative values

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