HyukjinKwon commented on code in PR #43925:
URL: https://github.com/apache/spark/pull/43925#discussion_r1400210509
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python/pyspark/sql/functions/builtin.py:
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@@ -17218,12 +17218,13 @@ def udf(
Parameters
----------
- f : function
+ f : function, optional
python function if used as a standalone function
- returnType : :class:`pyspark.sql.types.DataType` or str
+ returnType : :class:`pyspark.sql.types.DataType` or str, optional
the return type of the user-defined function. The value can be either a
:class:`pyspark.sql.types.DataType` object or a DDL-formatted type
string.
- useArrow : bool or None
+ Defaults to :class:`StringType.
Review Comment:
```suggestion
Defaults to :class:`StringType`.
```
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