[datatable-help] About roll in data.table

[statquant3]

I wrote a post on S.O
http://stackoverflow.com/questions/17216843/rolling-joins-in-data-table-with-multiple-matches/17219629?noredirect=1#comment24955451_17219629

It seems that when "roll" is specified in Y[X, roll=rollValue] even if there
are several lines of Y that matches one row of X, just one is selected.
I was looking for window joins like in kdb:
http://code.kx.com/wiki/Reference/wj et I was thinking that because all the
roll logic is already there, may be it would be a good feature to get all
rows matched when roll is specified.

What do you think ?



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