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 <[email protected]>
Date: 2017-08-10T15:10:53Z
Add nullability support.
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