nealrichardson commented on code in PR #13621:
URL: https://github.com/apache/arrow/pull/13621#discussion_r922187503


##########
r/R/dplyr-group-by.R:
##########
@@ -58,13 +58,13 @@ group_by.arrow_dplyr_query <- function(.data,
 group_by.Dataset <- group_by.ArrowTabular <- group_by.RecordBatchReader <- 
group_by.arrow_dplyr_query
 
 groups.arrow_dplyr_query <- function(x) syms(dplyr::group_vars(x))
-groups.Dataset <- groups.ArrowTabular <- groups.RecordBatchReader <- 
function(x) NULL
+groups.Dataset <- groups.ArrowTabular <- groups.RecordBatchReader <- 
function(x) syms(dplyr::group_vars(x))

Review Comment:
   Right, sorry, I forgot about that case. Then let's do this, which is a 
pattern we use throughout
   
   ```suggestion
   groups.Dataset <- groups.ArrowTabular <- groups.RecordBatchReader <- 
groups.arrow_dplyr_query
   ```



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