ianmcook commented on a change in pull request #10563:
URL: https://github.com/apache/arrow/pull/10563#discussion_r655739346
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File path: r/tests/testthat/test-dplyr.R
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@@ -800,6 +808,21 @@ test_that("type checks with is_*()", {
)
})
+test_that("type checks on expressions", {
+ expect_dplyr_equal(
+ input %>%
+ transmute(
+ a = is.character(as.character(int)),
Review comment:
Yes—this is a simplistic and somewhat contrived example of the
motivating use case. For a more compelling version of it, see ARROW-12055: To
make our translation of `is.na()` work consistently with base R, we will need
to run different code depending on whether its input has a real number type,
and we can't do that if we don't know the type.
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