GitHub user KevinZwx opened a pull request:

    [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 dev

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

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
commit 2073be263e31ba0a957b7ffa2bec2cafe40011d2
Author: HanShuliang <>
Date:   2017-08-10T06:46:04Z

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


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