GitHub user hvanhovell opened a pull request:

    https://github.com/apache/spark/pull/16821

    [SPARK-19472][SQL] Parser should mistake CASE WHEN(...) for a function call

    ## What changes were proposed in this pull request?
    The SQL parser can mistake a `WHEN (...)` used in `CASE` for a function 
call. This happens in cases like the following:
    ```sql
    select case when (1) + case when 1 > 0 then 1 else 0 end = 2 then 1 else 0 
end
    from tb
    ```
    This PR fixes this by re-organizing the case related parsing rules.
    
    ## How was this patch tested?
    Added a regression test to the `ExpressionParserSuite`.

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

    $ git pull https://github.com/hvanhovell/spark SPARK-19472

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

    https://github.com/apache/spark/pull/16821.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #16821
    
----
commit 870f29820b704c4ee73bb07e12db187a923a15e2
Author: Herman van Hovell <hvanhov...@databricks.com>
Date:   2017-02-06T15:03:23Z

    Do not mistake CASE WHEN(...) for a function call.

----


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