thisisnic commented on issue #46636:
URL: https://github.com/apache/arrow/issues/46636#issuecomment-2921964754

   Oops, my bad, it was a trimmed down version of a bigger reprex, thanks for 
highlighting that!
   
   Confirmed the same behaviour:
   
   ``` r
   library(arrow)
   library(dplyr)
   
   code <- '
   pattern = "a"
   
   arrow_df <- arrow_table(x = c("a", "b", "c"))
   
   arrow_df |>
     mutate(x2 = case_when(pattern == "a" ~ "foo")) |>
     collect()
   '
   
   tf <- tempfile(fileext = ".R")
   writeLines(code, tf)
   source(tf, local = new.env())
   #> Error in `case_when()`:
   #> ! object 'pattern' not found
   ```


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