nikostr opened a new issue, #41959:
URL: https://github.com/apache/arrow/issues/41959
### Describe the enhancement requested
I'm interested in finding the number of non-zero columns for every row in my
table. I'm currently doing something like this:
```
f <- function(x) x==0
g <- function(...) Reduce(`+`, list(...))
sample_names <- paste0('sample', 1:3)
open_delim_dataset(
'test.txt',
col_names = c('kmer', sample_names),
delim = ' ',
) %>%
mutate(
across(-kmer, f, .names='bool_{.col}'),
n_zero = g(!!!syms(paste0('bool_',sample_names)))
)
```
which gives the error `Function 'add_checked' has no kernel matching input
types (bool, bool)`. I've tried `cast`ing across the columns but I haven't
managed to change them from bools to ints. I've also tried using
`rowSums(across(starts_with('bool')))` instead of the `Reduce`, but apparently
that isn't supported either. What is the recommended way of doing this?
### Component(s)
R
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