shallow should check (and remove) secondary key attributes.
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 35/100
Research direction
Start by running the R reproduction with data.table's shallow() and indices() calls, then inspect the implementation and secondary-key attribute handling. Done means shallow() no longer retains stale secondary key attributes, as confirmed by the indices(d) result.
Written by the indexing model from the issue text.
Description
shallow() is still internal, and hasn't been used along with secondary keys yet. So it doesn't break anything. Hence setting this to 1.9.8.
DT = as.data.table(iris)
setindex(DT, Species)
indices(DT)
#[1] "Species"
d = shallow(DT)
indices(d)
#[1] "Species"
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