[datatable-help] Secondary keys

[Chinmay Patil]

Hi devs,

I was wondering if there are any plans to implement this feature.

https://r-forge.r-project.org/tracker/index.php?func=detail&aid=1007&group_id=240&atid=978

Alternatively, is there a way to refer to key of the data.table object in
"J" function used for subsetting?
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