rbindlist edge case inconsistency
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 45/100
Research direction
Start by reproducing Cases I–III with the rbindlist entry point in the issue. Compare the handling of NULL elements and the warning behavior; done means Case I retains its column and fills the missing value with NA consistently with Cases II and III.
Written by the indexing model from the issue text.
Description
Consider the difference in behavior here:
# --- CASE I : one empty item, one column, one populated ---
(l = list(list(NULL), list(1L)))
# [[1]]
# [[1]][[1]]
# NULL
# [[2]]
# [[2]][[1]]
# [1] 1
rbindlist(l)
# V1
# 1: 1
# --- CASE II : One item, two columns, one empty ---
(l = list(list(NULL, 1L)))
# [[1]]
# [[1]][[1]]
# NULL
# [[1]][[2]]
# [1] 1
# V1 V2
# 1: NA 1
# --- CASE III : Two items, two columns, one each empty ---
(l = list(list(NULL, 1L), list(1L, NULL)))
# [[1]]
# [[1]][[1]]
# NULL
# [[1]][[2]]
# [1] 1
# [[2]]
# [[2]][[1]]
# [1] 1
# [[2]][[2]]
# NULL
rbindlist(l)
# V1 V2
# 1: NA 1
# 2: 1 NA
Given Cases II and III, I would expect Case I to also fill the NULL value with NA (with the same warning), rather than to eliminate it altogether.
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