ianmcook commented on a change in pull request #9958:
URL: https://github.com/apache/arrow/pull/9958#discussion_r610611111
##########
File path: r/tests/testthat/test-dataset.R
##########
@@ -1767,3 +1767,13 @@ test_that("Dataset writing: unsupported features/input
validation", {
write_dataset(ds, tempfile(), basename_template = NULL)
)
})
+
+# see https://issues.apache.org/jira/browse/ARROW-11328
+test_that("Collecting zero columns from a dataset doesn't return entire
dataset", {
+ tmp <- tempfile()
+ write_dataset(mtcars, tmp, format = "parquet")
+ expect_equal(
+ open_dataset(tmp) %>% select() %>% collect() %>% dim(),
+ c(32,0)
Review comment:
Space after comma (https://style.tidyverse.org/syntax.html#commas)
```suggestion
c(32, 0)
```
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