GitHub user huaxingao opened a pull request:

    [SPARK-23912][SQL]add array_distinct

    ## What changes were proposed in this pull request?
    Add array_distinct to remove duplicate value from the array.
    ## How was this patch tested?
    Add unit tests

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

    $ git pull spark-23912

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 #21050
commit 3bfb23ed6bfe0cefe9ed71f24678123bb57e3ce2
Author: Huaxin Gao <huaxing@...>
Date:   2018-04-12T04:52:25Z

    [SPARK-23912][SQL]add array_distinct



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