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From "Luke Miner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-19428) Ability to select first row of groupby
Date Sat, 04 Feb 2017 18:15:52 GMT

    [ https://issues.apache.org/jira/browse/SPARK-19428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15852884#comment-15852884
] 

Luke Miner commented on SPARK-19428:
------------------------------------

That would be fantastic. Would it be possible to generalize it so that you could get more
than one if needed?

{{df.groupBy("group").agg(head("somecolumn"))}}

I've also had the use case where people ask me to get the top ten by some criteria for each
group. For example, 10 biggest employers in each county.

> 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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