ianmcook commented on a change in pull request #9716:
URL: https://github.com/apache/arrow/pull/9716#discussion_r595460633
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File path: r/R/dplyr.R
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@@ -424,11 +427,16 @@ restore_dplyr_features <- function(df, query) {
if (grouped) {
Review comment:
I checked that, and no, it turns out that `dplyr::group_by(.drop =
FALSE)` (with no dots arguments) does the same thing as `dplyr::ungroup()`. It
does not preserve `.drop`. One of the tests I added checks that we're
consistent with dplyr on that:
https://github.com/apache/arrow/pull/9716/files#diff-b54a9d9f7fc3cb71878c6396ac9b36893e7f60fb9f48c27fe41aeb5b8a1f5a48R237-R242
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