ianmcook commented on a change in pull request #10563:
URL: https://github.com/apache/arrow/pull/10563#discussion_r658842787



##########
File path: r/tests/testthat/test-dplyr.R
##########
@@ -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:
       I created ARROW-13186 for future consideration of ways to implement type 
determination more cleanly




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