Github user zero323 commented on the issue:
https://github.com/apache/spark/pull/16534
__Note__:
We'll need a bit more work if we want to provide correct argument list for
legacy python.
```
Welcome to
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/__ / .__/\_,_/_/ /_/\_\ version 2.2.0-SNAPSHOT
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Using Python version 2.7.11 (default, Dec 6 2015 18:08:32)
SparkSession available as 'spark'.
In [1]: from pyspark.sql.types import IntegerType
In [2]: from pyspark.sql.functions import udf
In [3]: f = udf(lambda x: x, IntegerType())
In [4]: ?f
Signature: f(*args)
Docstring: SQL Type: IntegerType
File: ~/Workspace/spark/python/pyspark/sql/functions.py
Type: function
```
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