GitHub user viirya opened a pull request:

    [SPARK-21654][SQL] Complement SQL predicates expression description

    ## What changes were proposed in this pull request?
    SQL predicates don't have complete expression description. This patch goes 
to complement the description by adding arguments, examples.
    ## How was this patch tested?
    Existing tests.

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

    $ git pull SPARK-21654

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 #18869
commit abfa86739735cc8d4079a0b16a89e0c728cd31f3
Author: Liang-Chi Hsieh <>
Date:   2017-08-07T08:41:46Z

    Complement SQL predicates document.


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