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Posted to issues@spark.apache.org by "Albert Ziegler (Jira)" <ji...@apache.org> on 2024/02/22 13:40:00 UTC

[jira] [Created] (SPARK-47132) Mistake in Docstring for Pyspark's Dataframe.head()

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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