Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20237#discussion_r161371952
--- Diff: python/pyspark/sql/functions.py ---
@@ -2184,6 +2184,11 @@ def pandas_udf(f=None, returnType=None,
functionType=None):
| 8| JOHN DOE| 22|
+----------+--------------+------------+
+ .. note:: The length of `pandas.Series` within a scalar UDF is not
that of the whole input
+ column, but is the length of an internal batch used for each
call to the function.
--- End diff --
Nit: `but is` -> `but`
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