Feature request: Group by Row ID

Dear KNIMErs,

It's all in the titile: "Feature request: Group by Row ID" - pretty please!

t annoys me to no end having to apply the RowID node beforehand in order to simply count records (frequent issue) or to mass-apply aggregation functions to each row (still much less frequent, but potentially useful for e.g. logging all columns with "Sum of Logs").

Better yet, a Math node with GroupBy-like column filters & abstractions! I think I posted this a few months back already... hrm. :-)

Thanks
E