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https://issues.apache.org/jira/browse/SPARK-19428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851784#comment-15851784
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Luke Miner commented on SPARK-19428:
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Couple of things. Sometimes I just want a random row from each group. However,
if sorting is allowed, then it is useful to get a single row from each group
based on the maximum or minimum of some column. Even more useful would be
something like
{{df.groupby('group').orderBy('foo').limit(n)}}
Then it would be easy to get the top {{n}} observations for each group based on
some criteria.
> Ability to select first row of groupby
> --------------------------------------
>
> Key: SPARK-19428
> URL: https://issues.apache.org/jira/browse/SPARK-19428
> Project: Spark
> Issue Type: Brainstorming
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Luke Miner
> Priority: Minor
>
> It would be nice to be able to select the first row from {{GroupedData}}.
> Pandas has something like this:
> {{df.groupby('group').first()}}
> It's especially handy if you can order the group as well.
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