GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/17911
[SPARK-20668][SQL] Modify ScalaUDF to handle nullability.
## What changes were proposed in this pull request?
When registering Scala UDF, we can know if the udf will return nullable
value or not. `ScalaUDF` and related classes should handle the nullability.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ueshin/apache-spark issues/SPARK-20668
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17911.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 #17911
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commit 120c862bada2e8a574f29ea4eb4434a528d59b3b
Author: Takuya UESHIN <[email protected]>
Date: 2017-05-05T04:17:18Z
Modify ScalaUDF to handle nullability.
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