DT[.(, 4L)] assumes "consider all values" for first key column
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Reproduce the keyed data.table example and compare the current results for DT[.(unique(x), 4L)] and DT[.(, 4L)]. Determine whether the shorter form is intended to mean all values for the first key column; done when the expected behavior is agreed and covered by a regression test.
Written by the indexing model from the issue text.
Description
require(data.table)
DT = data.table(x=c(1L,1L,2L,2L), y=c(3:4, 3:4), z=1:4, key=c("x", "y"))
DT[.(unique(x), 4L)]
# x y z
#1: 1 4 2
#2: 2 4 4
# could just be:
DT[.(, 4L)]
?
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