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Neal RichardsonJonathan Keane
cb1f15b87c1
Neal Richardson authored and Jonathan Keane committed f94c089c621
ARROW-14044: [R] Handle group_by .drop parameter in summarize

Should we add an option to the hash function that keeps groups for all dictionary values, regardless of whether they are present in indices?

Closes #11410 from nealrichardson/group-by-drop-summarize

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Jonathan Keane <jkeane@gmail.com>