Support setDT(L[[c(1, 2, 3)]]
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Start by reproducing the nested-list example with setDT(L[[1:3]]) and inspect the setDT path that reaches setlistelt. Confirm the intended behavior from the shown L[[c(1:3)]] result, then verify that the call completes without the internal error and produces the expected data.table.
Written by the indexing model from the issue text.
Description
We could eliminate this cruft by just supporting such case, I don't imagine it would be that hard? (famous last words)
Originally posted by @MichaelChirico in https://github.com/Rdatatable/data.table/pull/7064#discussion_r2164852205
L = list(list(NULL, list(NULL, NULL, data.frame(a = 1))))
L[[c(1:3)]]
# a
# 1 1
setDT(L[[1:3]])
# Error in setDT(L[[1:3]]) :
# Internal error in setlistelt: Second argument to setlistelt must a length 1 integer vector. Please report to the data.table issues tracker.
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