GitHub user mn-mikke opened a pull request:

    [SPARK-23926][SQL] Extending reverse function to support ArrayType arguments

    ## What changes were proposed in this pull request?
    This PR extends reverse functions to be able to operate over array columns 
and covers:
    - Introduction of Reverse expression that represents logic for reversing 
arrays and also strings
    - Removal of StringReverse expression
    - A wrapper for PySpark
    ## How was this patch tested?
    New tests added into:
    - CollectionExpressionsSuite
    - DataFrameFunctionsSuite

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

    $ git pull 

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 #21034
commit 3a76d87492a8d03a29aeee877f5564071b0a68a8
Author: mn-mikke <mrkaha12346github>
Date:   2018-04-09T14:12:16Z

    [SPARK-23926][SQL] Extending reverse function to support ArrayType 



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