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Ian CookNeal Richardson
17e2ae6f2fd
Ian Cook authored and Neal Richardson committed c171b275673
ARROW-11659: [R] Preserve group_by .drop argument

This preserves the `.drop` argument in the method for `dplyr::group_by()` and implements a method for `dplyr::group_by_drop_default()` which returns `TRUE` except on `arrow_dplyr_query` objects that were previously obtained by `group_by(.drop = FALSE)`.

Closes #9716 from ianmcook/ARROW-11659

Authored-by: Ian Cook <ianmcook@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>