nealrichardson commented on code in PR #13690:
URL: https://github.com/apache/arrow/pull/13690#discussion_r930110815
##########
r/tests/testthat/test-dataset-write.R:
##########
@@ -139,6 +139,23 @@ test_that("Writing a dataset: Parquet->Parquet (default)",
{
)
})
+test_that("Writing a dataset: `basename_template` default behavier", {
Review Comment:
We should have a test of providing `basename_template`, looks like we don't
have one. Would you be interested in adding one here?
##########
r/R/dataset-write.R:
##########
@@ -123,7 +124,7 @@ write_dataset <- function(dataset,
path,
format = c("parquet", "feather", "arrow", "ipc",
"csv"),
partitioning = dplyr::group_vars(dataset),
- basename_template = paste0("part-{i}.",
as.character(format)),
+ basename_template = NULL,
Review Comment:
I actually don't think you need this change due to the magic of lazy
evaluation, you just need to add `format <- ifelse(as.character(format) %in%
c("feather", "ipc"), "arrow", format)` after `format <- match.arg(format)`
```
> f <- function(x = c("a", "b", "c"), basename_template =
paste0("part-{i}.", x)) {
+ x <- match.arg(x)
+ x <- toupper(x)
+ basename_template
+ }
> f()
[1] "part-{i}.A"
```
The benefit of this is that you still get to see the default value for
`basename_template` in the signature/docs.
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