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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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Maciej Szymkiewicz updated SPARK-19162:
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Affects Version/s: (was: 1.5.0)
> Input types validation
> ----------------------
>
> 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
>
> =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}
> Invalid arguments to UDF call fail fast but with a bit cryptic Py4J errors:
> {code}
> In [5]: g = udf(lambda x: x)
> In [6]: df.select(f([]))
> ---------------------------------------------------------------------------
> Py4JError Traceback (most recent call last)
> <ipython-input-10-5fb48a5d66d2> in <module>()
> ----> 1 df.select(f([]))
> ....
> Py4JError: An error occurred while calling
> z:org.apache.spark.sql.functions.col. Trace:
> py4j.Py4JException: Method col([class java.util.ArrayList]) does not exist
> at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:318)
> at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:339)
> at py4j.Gateway.invoke(Gateway.java:274)
> at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
> at py4j.commands.CallCommand.execute(CallCommand.java:79)
> at py4j.GatewayConnection.run(GatewayConnection.java:214)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> Proposed
> Apply basic type validation for both constructor arguments:
> {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}
> and call arguments:
> {code}
> In [8]: f = udf(lambda x: x)
> In [9]: f(1)
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call last)
> ...
> TypeError: All arguments should be Columns or strings representing column
> names. Got 1 of type <class 'int'>
> {code}
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