[datatable-help] Memory usage of data.table chaining

[Mick Cooney]

I generally don't think of using the key, is it worth setting
temporary keys for stuff like that?

I would have thought that if you are doing a select on different
columns (thus meaning the keys would need to be recreated) that the
speed up from the key-based select would be negated by the cost of
resetting keys?

It's definitely something I should probably consider doing more.

-- 
Mick Cooney
mickcooney at gmail.com