[ARROW-17085] [R] group_vars() should not return NULL

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 8.0.0
• Fix Version/s: 9.0.0
• Component/s: R
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/32392
• Assignee: SHIMA Tatsuya
• Reporter: SHIMA Tatsuya
• Created: 15/Jul/22 12:17
• Updated: 11/Jan/23 11:48
• Resolved: 15/Jul/22 16:07

Description

mtcars |> dplyr::group_vars()
#> character(0)
mtcars |> arrow:::as_adq() |> dplyr::group_vars()
#> character(0)
mtcars |> arrow::arrow_table() |> dplyr::group_vars()
#> NULL

dplyr::group_vars(<data.frame>) does not return NULL, so the following code will result in an error.

mtcars |> arrow::arrow_table() |> dtplyr::lazy_dt()
#> Error in new_step(parent, vars = names(parent), groups = groups, locals = list(), : is.character(groups) is not TRUE

Issue Links

• links to: GitHub Pull Request #13621