paleolimbot commented on issue #14872:
URL: https://github.com/apache/arrow/issues/14872#issuecomment-1343297254

   Thanks @DavZim and @eitsupi for the awesome reprexes!
   
   The problem is there some code that silently assumed that there were zero 
existing groups. The relevant chunk is here, I think:
   
   
https://github.com/apache/arrow/blob/7d857646f17e46c83cb2cdff4a4feb8b2657d1c9/r/R/dplyr-group-by.R#L40-L45
   
   Here, `new_groups` has a different length than `new_group_names` which is 
causing the weirdness.


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