GitHub user ptkool opened a pull request:

    https://github.com/apache/spark/pull/18906

    [SPARK-21692] Add nullability support to PythonUDF.

    ## What changes were proposed in this pull request?
    When registering a Python UDF, a user may know whether the function can 
return null values or not. PythonUDF and all related classes should handle 
nullability.
    
    ## How was this patch tested?
    Existing tests and a few new tests.


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

    $ git pull https://github.com/ptkool/spark udf_nullability

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

    https://github.com/apache/spark/pull/18906.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 #18906
    
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commit 4f591f05b8a7f5b8a51dbfc938726557362e8183
Author: ptkool <michael.sty...@shopify.com>
Date:   2017-08-10T15:10:53Z

    Add nullability support.

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