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rownames_to_column() gives warning if used on data.frame with no columns #786

EmilHvitfeldt opened this issue Jun 7, 2020 · 2 comments


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EmilHvitfeldt commented Jun 7, 2020

The title says it all. rownames_to_column() gives a warning if used on data.frame with no columns, but works as intended if there are columns.


a <- matrix(nrow = 1, ncol = 0)
rownames(a) <- "name"
a_df <-

#> Warning: The `.data` argument of `add_column()` must have unique names as of tibble 3.0.0.
#> Use `.name_repair = "minimal"`.
#> This warning is displayed once every 8 hours.
#> Call `lifecycle::last_warnings()` to see where this warning was generated.
#>   rowname
#> 1    name

Created on 2020-06-07 by the reprex package (v0.3.0)


a <- matrix(nrow = 1, ncol = 1)
rownames(a) <- "name"
a_df <-

#>   rowname V1
#> 1    name NA

Created on 2020-06-07 by the reprex package (v0.3.0)

@krlmlr krlmlr closed this as completed in 2b20fa2 Jun 12, 2020
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krlmlr commented Jun 12, 2020

Thanks for reporting!

krlmlr added a commit that referenced this issue Feb 25, 2021
tibble 3.0.2

- `[[` works with classed indexes again, e.g. created with `glue::glue()` (#778).
- `add_column()` works without warning for 0-column data frames (#786).
- `tribble()` now better handles named inputs (#775) and objects of non-vtrs classes like `lubridate::Period` (#784) and `formattable::formattable` (#785).

- Subsetting and subassignment are faster (#780, #790, #794).
- `is.null()` is preferred over `is_null()` for speed.
- Implement continuous benchmarking (#793).

- `is_vector_s3()` is no longer reexported from pillar (#789).
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