GitHub user mgaido91 opened a pull request:

    [SPARK-23916][SQL] Add array_join function

    ## What changes were proposed in this pull request?
    The PR adds the SQL function `array_join`. The behavior of the function is 
based on Presto's one.
    The function accepts an `array` of `string` which is to be joined, a 
`string` which is the delimiter to use between the items of the first argument 
and optionally a `string` which is used to replace `null` values.
    ## How was this patch tested?
    added UTs

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

    $ git pull SPARK-23916

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 #21011
commit 1408cfcd8f0ad2a571d29b57d71128584ea4b4f0
Author: Marco Gaido <marcogaido91@...>
Date:   2018-04-09T16:16:43Z

    [SPARK-23916][SQL] Add array_join function



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