Triggered internal error with an expression in j while grouping
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 42/100
Research direction
No file or test is named. Start by running the data.table reproducer and trace the [.data.table path that rejects expression columns during grouping. Done means the expression remains unsupported but produces a user-facing error rather than an internal-error message, with regression coverage for the example.
Written by the indexing model from the issue text.
Description
Breaking things trying to do coverage and hit an "internal" error:
data.table(e = expression(1), c = '1')[ , e, by = c]
Error in `[.data.table`(data.table(e = expression(1), c = "1"), , e, by = c) :
Internal error: column type 'expression' not supported by data.table subset. All known types are supported so please report as bug.
Of course this should stay an error, but handled differently.
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