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[SPARK-11860][PYSAPRK][DOCUMENTATION] Invalid argument specification … #9901

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[SPARK-11860][PYSAPRK][DOCUMENTATION] Invalid argument specification … #9901

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5 changes: 3 additions & 2 deletions python/pyspark/sql/context.py
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Original file line number Diff line number Diff line change
Expand Up @@ -195,14 +195,15 @@ def range(self, start, end=None, step=1, numPartitions=None):
@ignore_unicode_prefix
@since(1.2)
def registerFunction(self, name, f, returnType=StringType()):
"""Registers a lambda function as a UDF so it can be used in SQL statements.
"""Registers a python function (including lambda function) as a UDF
so it can be used in SQL statements.

In addition to a name and the function itself, the return type can be optionally specified.
When the return type is not given it default to a string and conversion will automatically
be done. For any other return type, the produced object must match the specified type.

:param name: name of the UDF
:param samplingRatio: lambda function
:param f: python function
:param returnType: a :class:`DataType` object

>>> sqlContext.registerFunction("stringLengthString", lambda x: len(x))
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