Albert Ziegler created SPARK-47132:
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Summary: Mistake in Docstring for Pyspark's Dataframe.head()
Key: SPARK-47132
URL: https://issues.apache.org/jira/browse/SPARK-47132
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 3.5.0
Reporter: Albert Ziegler
The docstring claims that {{head(n)}} would return a {{Row}} (rather than a
list of rows) iff n == 1, but that's incorrect.
Type hints, example, and implementation show that the difference between row or
list of rows lies in whether n is supplied at all -- if it isn't, {{head()}}
returns a {{{}Row{}}}, if it is, even if it is 1, {{head(n)}} returns a list.
A suggestion to fix is here: https://github.com/apache/spark/pull/45197
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