nealrichardson commented on issue #43662:
URL: https://github.com/apache/arrow/issues/43662#issuecomment-2286424271
Looks like you have to check that `replacement` is a scalar string but then
`coalesce()` does the job.
```
arrow_table(x = c("a", NA, NA, NA, "b")) |>
mutate(x = coalesce(x, "Missing data")) |>
collect()
# A tibble: 5 × 1
x
<chr>
1 a
2 Missing data
3 Missing data
4 Missing data
5 b
```
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