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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