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https://issues.apache.org/jira/browse/SPARK-19162?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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holdenk resolved SPARK-19162.
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Resolution: Fixed
Fix Version/s: 2.2.0
> UserDefinedFunction constructor should verify that func is callable
> -------------------------------------------------------------------
>
> Key: SPARK-19162
> URL: https://issues.apache.org/jira/browse/SPARK-19162
> Project: Spark
> Issue Type: Sub-task
> Components: PySpark, SQL
> Affects Versions: 1.6.0, 2.0.0, 2.1.0, 2.2.0
> Reporter: Maciej Szymkiewicz
> Assignee: Maciej Szymkiewicz
> Priority: Minor
> Fix For: 2.2.0
>
>
> Current state
> Right now `UserDefinedFunctions` don't perform any input type validation. It
> will accept non-callable objects just to fail with hard to understand
> traceback:
> {code}
> In [1]: from pyspark.sql.functions import udf
> In [2]: df = spark.range(0, 1)
> In [3]: f = udf(None)
> In [4]: df.select(f()).first()
> 17/01/07 19:30:50 ERROR Executor: Exception in task 2.0 in stage 2.0 (TID 7)
> ...
> Py4JJavaError: An error occurred while calling o51.collectToPython.
> ...
> TypeError: 'NoneType' object is not callable
> ...
> {code}
> Proposed
> Apply basic validation for {{func}} argument:
> {code}
> In [7]: udf(None)
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call last)
> <ipython-input-7-0765fbe657a9> in <module>()
> ----> 1 udf(None)
> ...
> TypeError: func should be a callable object (a function or an instance of a
> class with __call__). Got <class 'NoneType'>
> {code}
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