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Posted to jira@arrow.apache.org by "Nicola Crane (Jira)" <ji...@apache.org> on 2022/10/12 08:19:00 UTC
[jira] [Updated] (ARROW-17948) [R] arrow_eval user-defined generic functions

     [ https://issues.apache.org/jira/browse/ARROW-17948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nicola Crane updated ARROW-17948:
---------------------------------
    Description: 
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|https://stackoverflow.com/questions/73950714/is-it-possible-to-use-generics-in-apache-arrow]:


{code:r}
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))
{code}


  was:
ARROW-14071 covers evaluating user-defined functions, but once this is implemented, would it be possible to evaluate generics?  Here's an example of how that works in dplyr from a [Stack Overflow question|https://stackoverflow.com/questions/73950714/is-it-possible-to-use-generics-in-apache-arrow]:


{code:r}
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))
{code}



> [R] arrow_eval user-defined generic functions  
> -----------------------------------------------
>
>                 Key: ARROW-17948
>                 URL: https://issues.apache.org/jira/browse/ARROW-17948
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Nicola Crane
>            Priority: Major
>
> 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|https://stackoverflow.com/questions/73950714/is-it-possible-to-use-generics-in-apache-arrow]:
> {code:r}
> 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))
> {code}



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