wjones127 commented on a change in pull request #11894:
URL: https://github.com/apache/arrow/pull/11894#discussion_r779694269
##########
File path: r/tests/testthat/test-dataset.R
##########
@@ -453,15 +453,38 @@ test_that("Creating UnionDataset", {
})
test_that("map_batches", {
- skip("map_batches() is broken (ARROW-14029)")
ds <- open_dataset(dataset_dir, partitioning = "part")
+
+ # summarize returns arrow_dplyr_query
expect_equal(
ds %>%
filter(int > 5) %>%
select(int, lgl) %>%
- map_batches(~ summarize(., min_int = min(int))),
+ map_batches(~ summarize(., min_int = min(int))) %>%
+ arrange(min_int),
tibble(min_int = c(6L, 101L))
)
+
+ # $num_rows returns integer vector
+ expect_equal(
+ ds %>%
+ filter(int > 5) %>%
+ select(int, lgl) %>%
+ map_batches(~ .$num_rows, .data.frame = FALSE) %>%
+ as.numeric() %>%
+ sort(),
+ c(5, 10)
+ )
+
+ # $Take returns RecordBatch
Review comment:
It returns a record batch within that function. But since the
`.data.frame` option on `map_batches()` is `TRUE` by default, the results are
combined into a tibble using `dplyr::bind_rows()`.
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