thisisnic commented on issue #35180:
URL: https://github.com/apache/arrow/issues/35180#issuecomment-1522113246
Thanks for all the effort there trying to make this work, I can see you've
delved right into the deep end of things!
> I tried to find a place for Array functions, but I realise that there are
none
So this isn't super well-documented, which is most likely why you didn't
find it, but there's an R6 class in the package called ArrowDatum. It's the
base class for Array, ChunkedArray, and Scalar objects, and the point of it is
basically to allow developers to write a function e.g. `my_fun.ArrowDatum()`,
which will run on object of this class.
For example, the S3 method for the `unique()` function (which has an
identically named C++ equivalent function) looks like this:
```
#' @export
unique.ArrowDatum <- function(x, incomparables = FALSE, ...) {
call_function("unique", x)
}
```
There's a PR here which shows someone implementing `exp` and `sqrt` both for
Tables and for ArrowDatum objects.
https://github.com/apache/arrow/pull/13517/files
I reckon you could probably take a similar approach for the cumsum function.
It might end up being simpler than you thought (but it's the surrounding
complexity, and things being hidden away which make it, reasonably, look
complex).
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