groupby aggregate() function for SDFs

@martindurant, @CJ-Wright Currently, is there a way of performing an operation on SDFs involving multiple column aggregations after groupby like:

sdf.groupby('x').agg({'y':'sum', 'z':'mean'}) 

If not, any opinions on how difficult it would be to add this functionality?

[CJ-Wright]

Full disclosure I haven’t used streaming dataframes that much, so please take that with a grain of salt

[chinmaychandak]

@cheekybastard Thanks for helping out, but I don’t think this would work, since this is not maintaining cumulative state like SDFs do. I’ll give it a try, though