ianmcook commented on a change in pull request #9999:
URL: https://github.com/apache/arrow/pull/9999#discussion_r626901825
##########
File path: r/tests/testthat/test-dplyr-mutate.R
##########
@@ -32,59 +51,23 @@ test_that("mutate() is lazy", {
)
})
-test_that("basic mutate", {
- expect_dplyr_equal(
- input %>%
- select(int, chr) %>%
- filter(int > 5) %>%
- mutate(int = int + 6L) %>%
- collect(),
- tbl
- )
-})
+# similar to
https://github.com/tidyverse/dplyr/blob/master/tests/testthat/test-mutate.r#L1-L10
+test_that("empty mutate returns input", {
+ # dbl2 = 5, so I'm grouping by a constant
+ gtbl <- group_by(tbl, dbl2)
-test_that("mutate() with NULL inputs", {
- expect_dplyr_equal(
- input %>%
- mutate(int = NULL) %>%
- collect(),
- tbl
- )
+ expect_dplyr_equal(input %>% mutate() %>% collect(), tbl)
+ expect_dplyr_equal(input %>% mutate(!!!list()) %>% collect(), tbl)
+ expect_dplyr_equal(input %>% mutate() %>% collect(), gtbl)
+ expect_dplyr_equal(input %>% mutate(!!!list()) %>% collect(), gtbl)
Review comment:
The intent is to check that `mutate()` returns its input regardless of
whether its input is grouped. @pachamaltese could you please add a concise
comment saying that?
Also: because of ARROW-11769, the grouping added to `gtbl` by `group_by()`
is actually lost when it's converted to a `Table` or `RecordBatch`. The tests
pass regardless of this because `expect_dplyr_equal()` calls
`expect_equivalent()` which ignores grouping. But we should fix it regardless.
To do this, remove the `gtbl` assignment above and rewrite the two tests
involving `gtbl` like this:
```r
expect_dplyr_equal(input %>% group_by(dbl2) %>% mutate() %>% collect())
expect_dplyr_equal(input %>% group_by(dbl2) %>% mutate(!!!list()) %>%
collect())
```
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