[R] arrow_eval user-defined generic functions

[asfimport]

ARROW-14071 and ARROW-16444 cover evaluating user-defined functions in different ways, but could we extend this behaviour so it be possible to evaluate generics? Here's an example of how that works in dplyr from a Stack Overflow question:

library(dplyr)

df <- data.frame(a = c("these", "are", "some", "strings"),
                 b = 1:4)

boop <- function(x, ...) UseMethod("boop", x)

boop.numeric <- function(x) mean(x, na.rm = TRUE)

boop.character <- function(x) mean(nchar(x), na.rm =TRUE )

df %>% summarise(across(everything(), boop))

Reporter: Nicola Crane / @thisisnic

Related issues:

• [R] Try to arrow_eval user-defined functions (relates to)

_{Note: This issue was originally created as ARROW-17948. Please see the migration documentation for further details.}

[thisisnic]

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