GitHub user zero323 opened a pull request:
https://github.com/apache/spark/pull/16537
[SPARK-19165][PYTHON][SQL][WIP] UserDefinedFunction.__call__ should
validate input types
## What changes were proposed in this pull request?
Adds basic input validation for `UserDefinedFunction.__call__` to avoid
failing with cryptic `Py4J` errors.
## How was this patch tested?
Unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zero323/spark SPARK-19165
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16537.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 #16537
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