data.table in j results in an error
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 30/100
Research direction
Start by running the issue's R reproducer with dt1 and dt2, comparing dt2[, dt1, by = b] with dt2[, dt1[], by = b]. Trace how the j expression is evaluated and how the resulting object is formatted, then add a regression test covering the failing form and confirm both expressions produce the expected grouped output.
Written by the indexing model from the issue text.
Description
Not sure what's going on here, some weird bug:
dt1 = data.table(a = 1)
dt2 = data.table(b = 1:2)
dt2[, dt1, by = b]
#Error in FUN(X[[2L]], ...) :
# Invalid column: it has dimensions. Can't format it. If it's the result of data.table(table()), use as.data.table(table()) instead.
dt2[, dt1[], by = b]
# b a
#1: 1 1
#2: 2 1
- Dominant language
- R
- Stars
- 3.9k
- Forks
- 1.1k
- Avg merge
- 14h 4m
- Merged PRs (30d)
- 4
Contributor guide
First steps
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- Open a pull request that references the issue number.
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