> > There wasn't a 'key' argument before and yes, it will change the key > regardless of whether you're merging or not. Initially I added it just for > the merges, but then realized that there us no conceptual reason to > restrict it just to merges.
Ah, my mistake. I saw "key" under the list of arguments in the documentation and assumed it applied to [.data.table; but it's actually for the data.table function. Ah what am I thinking - you'll have to copy and still set a key, so unless > you have to go back to the old key (rarely?) this is strictly faster. > Yeah, that was my initial use case, a "temporary key". This new syntax/functionality should be useful when I don't want to go back to the old key, though. --Frank >
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