In HiveQL, you should be able to express this as:
SELECT ... FROM table GROUP BY m['SomeKey']
On Sat, Apr 4, 2015 at 5:25 PM, Justin Yip <yipjus...@prediction.io> wrote:
> Hello,
>
> I have a case class like this:
>
> case class A(
> m: Map[Long, Long],
> ...
> )
>
> and constructed a DataFrame from Seq[A].
>
> I would like to perform a groupBy on A.m("SomeKey"). I can implement a
> UDF, create a new Column then invoke a groupBy on the new Column. But is it
> the idiomatic way of doing such operation?
>
> Can't find much info about operating MapType on Column in the doc.
>
> Thanks ahead!
>
> Justin
>
