`as.data.frame.data.table(x)` errors when `x` has no column names: `setalloccol`
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 35/100
Research direction
Start by reproducing the example in R, then trace as.data.frame.data.table(x) through setalloccol, the entry points named in the report. Done means converting a data.table with no column names succeeds without the allocation error, with regression coverage for this case.
Written by the indexing model from the issue text.
Description
I ran into this interesting error when trying to convert a data.table without column names to a data frame.
library(data.table)
x <- data.table(mtcars)
colnames(x) <- NULL
as.data.frame(x)
#> Error in setalloccol(y): Internal error in alloccol: length of names (0) is not length of dt (11). Please report to the data.table issues tracker.
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