Warning for set / := when numToDo > nrow(x)?
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 42/100
Research direction
Start at the data.table set/:= entry point and review the follow-up issues #2837, #1885, and #3460 for the existing assignment behavior. Reproduce the supplied c(1, 1) example with length(i) greater than nrow(x); done means this case produces the agreed warning without running duplicated unnecessarily.
Written by the indexing model from the issue text.
Description
Follow-up to #2837 inspired by #1885 / #3460
We decided running duplicated every time we run set/:= to help protect against duplicated assignment is overkill & an efficiency killer.
However, when length(i) > nrow(x), there's no need to run duplicated -- there's guaranteed to be at least one duplicate in i (Pigeonhole):
DT = data.table(a = 1L)
DT[c(1, 1), a := 2:3]
We could warn in this case?
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