nealrichardson commented on a change in pull request #9618:
URL: https://github.com/apache/arrow/pull/9618#discussion_r585902139



##########
File path: r/R/dataset-write.R
##########
@@ -56,11 +56,12 @@
 #' @export
 write_dataset <- function(dataset,
                           path,
-                          format = dataset$format,
+                          format = c("parquet", "feather", "arrow", "ipc"),

Review comment:
       Need to update the docs to reflect the new behavior. You may (also) want 
to borrow the language used to describe `format` from `dataset-format.R`.

##########
File path: r/tests/testthat/test-dataset.R
##########
@@ -1061,6 +1061,17 @@ test_that("Writing a dataset: Parquet->Parquet 
(default)", {
   )
 })
 
+test_that("Writing a dataset: Not specified format", {
+  skip_on_os("windows") # https://issues.apache.org/jira/browse/ARROW-9651
+  dst_dir <- make_temp_dir()
+  write_dataset(mtcars, dst_dir)
+  new_ds <- open_dataset(dst_dir)

Review comment:
       FWIW the default format for open_dataset() is parquet, so this test 
would have failed if it hadn't written parquet files. 




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