dplyr 1.1.0 ungroup() drops data frame attributes

[mkoohafkan]

This is referring to tibble attributes, not tibble column attributes. The CRAN install of dplyr 1.1.0 sometimes drops attributes:

d = mtcars
attr(d, "foo") = "bar"
attr(d, "foo")
#> [1] "bar"

## preserved
d |> select(cyl) |> attr("foo")
#> [1] "bar"
d |> rename(cyl2 = cyl) |> attr("foo")
#> [1] "bar"
d |> arrange(cyl) |> attr("foo")
#> [1] "bar"
d |> group_by(cyl) |> attr("foo")
#> [1] "bar"
d |> mutate(mpg2 = mpg) |> attr("foo")
#> [1] "bar"
d |> transmute(mpg2 = mpg) |> attr("foo")
#> [1] "bar"
d |> filter(cyl == 1L) |> attr("foo")
#> [1] "bar"
d |> count(cyl) |> attr("foo") 
#> [1] "bar"
d |> bind_rows(d) |> attr("foo")
#> [1] "bar"
d |> bind_cols(select(d, cyl2 = cyl)) |> attr("foo")
#> [1] "bar"


## dropped
d |> group_by(cyl) |> ungroup() |> attr("foo")
#> NULL
d |> summarize(mpg = max(mpg)) |> attr("foo")
#> NULL

I can understand why it might make sense for summarize() to drop attributes (but then why does count() preserve them?), but I don't see why ungroup(group_by(...)) should drop attributes unilaterally. Given that almost all dplyr verbs preserve the attribute, I'm wondering if this is a bug/regression.

There are a variety of issues regarding attributes but they are all closed.

• Improve support non-base types dplyr#2432
• Preserve free-floating data.frame attributes where possible? dplyr#5132
• Use vctrs::vec_restore to preserve data frame subclass and attributes dplyr#3429

[mkoohafkan]

ugh sorry, thought I was in the dplyr repo

[krlmlr]

Thanks. Can you please take this to the dplyr repo?