Re: how to select first 50 value of each group after group by?

[Tal Grynbaum]

You can use rank window function to rank each row in the group,  and then
filter the rowz with rank < 50

On Wed, Jul 6, 2016, 14:07 <luohui20...@sina.com> wrote:

> hi there
> I have a DF with 3 columns: id , pv, location.(the rows are already
> grouped by location and sort by pv in des)  I wanna get the first 50 id
> values grouped by location. I checked the API of
> dataframe,groupeddata,pairRDD, and found no match.
>       is there a way to do this naturally?
>       any info will be appreciated.
>
>
>
> --------------------------------
>
> Thanks&amp;Best regards!
> San.Luo
>