paleolimbot opened a new pull request #12432:
URL: https://github.com/apache/arrow/pull/12432
This PR defines the `Math` group generic for `ArrowDatum`, which allows
several more base R functions to be used with `Array` and `Scalar` objects.
This is particularly useful for exposing decimal math kernels (which are
non-existent in R to my knowledge) without having to go through a `Table`/dplyr
query.
``` r
# remotes::install_github("paleolimbot/arrow/r@r-math-generics")
library(arrow, warn.conflicts = FALSE)
dec <- Array$create(12.34)$cast(decimal128(10, 2))
floor(dec)
#> Array
#> <decimal128(10, 2)>
#> [
#> 12.00
#> ]
round(dec, digits = 1)
#> Array
#> <decimal128(10, 2)>
#> [
#> 12.30
#> ]
cos(dec)
#> Array
#> <double>
#> [
#> 0.9744873987650982
#> ]
acos(dec - 12L)
#> Array
#> <double>
#> [
#> 1.2238794292677349
#> ]
# binary ops already worked
dec + 1L
#> Array
#> <decimal128(13, 2)>
#> [
#> 13.34
#> ]
dec * dec
#> Array
#> <decimal128(21, 4)>
#> [
#> 152.2756
#> ]
dec + dec
#> Array
#> <decimal128(11, 2)>
#> [
#> 24.68
#> ]
dec ^ dec
#> Array
#> <double>
#> [
#> 2.9297399331911957e+13
#> ]
```
I imagine at some point the code in arrow-datum.R and compute.R should be
refactored to use all the translations that we've nicely defined in
dplyr-funcs-*.R (there's a lot of overlap).
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