GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/19787
[SPARK-22541][SQL] Explicitly claim that Python udfs can't be conditional
executed with short-curcuit evaluation
## What changes were proposed in this pull request?
Besides conditional expressions such as `when` and `if`, users may want to
conditionally execute python udfs by short-curcuit evaluation. We should also
explicitly note that python udfs don't support this kind of conditional
execution too.
## How was this patch tested?
N/A, just document change.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-22541
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19787.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 #19787
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commit 3b69777924d0ac54bc4b6ec9c740cb20774bf033
Author: Liang-Chi Hsieh <vii...@gmail.com>
Date: 2017-11-20T07:13:32Z
Add document for udf.
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