[GitHub] [spark] yoda-mon commented on pull request #34240: [SPARK-36972][PYTHON]Add max_by/min_by API to PySpark

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yoda-mon commented on pull request #34240:
URL: https://github.com/apache/spark/pull/34240#issuecomment-940644817


   @HyukjinKwon 
   
   I straggled with docstring but this kind of trials did not work...
   
   ```python
       >>> from pyspark.sql.functions import max_by
       >>> spark.createDataFrame([
       ...     ("Java", 2012, 20000),
       ...     ("dotNET", 2012, 5000),
       ...     ("dotNET", 2013, 48000),
       ...     ("Java", 2013, 30000)],
       ...     schema=("course", "year", "earnings")) \\
       ...     .groupby("course").agg(max_by("year", "earnings")).collect()
       :dedent:
       [Row(course='Java', max_by(year, earnings)=2013), \
       Row(course='dotNET', max_by(year, earnings)=2013)]
   ```
   I took around other functions and I'd like to switch to use `show` instead of `collect`, is it ok ?


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