[GitHub] [arrow] dgreiss commented on issue #33149: [R] dplyr support for rowwise()

["dgreiss (via GitHub)" <gi...@apache.org>]

dgreiss commented on issue #33149:
URL: https://github.com/apache/arrow/issues/33149#issuecomment-1642882368

   @thisisnic @paleolimbot thanks for the feedback. I was building on this issue #32656 which looks to bring Arrow closer to feature parity with dplyr functions.
   
   The dplyr docs have a few examples of when a user might want to use [rowwise](https://dplyr.tidyverse.org/reference/rowwise.html). 
   
   ```r
   df <- tibble(x = runif(6), y = runif(6), z = runif(6))
   # Compute the mean of x, y, z in each row
   df %>% rowwise() %>% mutate(m = mean(c(x, y, z)))
   # use c_across() to more easily select many variables
   df %>% rowwise() %>% mutate(m = mean(c_across(x:z)))
   
   # Compute the minimum of x and y in each row
   df %>% rowwise() %>% mutate(m = min(c(x, y, z)))
   
   ```
   Notably, `dbplyr` also doesn't implement [rowwise()](https://dplyr.tidyverse.org/reference/rowwise.html).


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