thisisnic opened a new issue, #40430:
URL: https://github.com/apache/arrow/issues/40430
### Describe the bug, including details regarding any error messages,
version, and platform.
I was trying to write up an R example using a dataset that has lots of
dictionary columns, but am unable to do string manipulation on it. Here's a
slightly contrived examples using mtcars:
``` r
library(arrow)
library(dplyr)
mtcars |>
mutate(cyl = as.factor(as.character(cyl))) |>
arrow_table() |>
mutate(cyl6 = str_detect(cyl, "6")) |>
collect()
#> Error in `compute.arrow_dplyr_query()`:
#> ! NotImplemented: Function 'match_substring_regex' has no kernel matching
input types (dictionary<values=string, indices=int8, ordered=0>)
```
I'm wondering if this is something we could enable from the R package side,
perhaps looking at the type of the column and doing some casting if we are
trying to do this type of operation? Or even in the C++ using the dictionary
values? I'm not sure how complicated this would be though.
### Component(s)
C++
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