ianmcook commented on a change in pull request #10737:
URL: https://github.com/apache/arrow/pull/10737#discussion_r671728387
##########
File path: r/tests/testthat/test-dplyr.R
##########
@@ -1063,4 +1063,123 @@ test_that("trig functions", {
df
)
-})
\ No newline at end of file
+})
+
+test_that("case_when()", {
+ expect_dplyr_equal(
+ input %>%
+ transmute(cw = case_when(lgl ~ dbl, !false ~ dbl + dbl2)) %>%
+ collect(),
+ tbl
+ )
+ expect_dplyr_equal(
+ input %>%
+ mutate(cw = case_when(int > 5 ~ 1, TRUE ~ 0)) %>%
+ collect(),
+ tbl
+ )
+ expect_dplyr_equal(
+ input %>%
+ transmute(cw = case_when(chr %in% letters[1:3] ~ 1L) + 41L) %>%
+ collect(),
+ tbl
+ )
+ expect_dplyr_equal(
+ input %>%
+ filter(case_when(
+ dbl + int - 1.1 == dbl2 ~ TRUE,
+ NA ~ NA,
+ TRUE ~ FALSE
+ ) & !is.na(dbl2)) %>%
+ collect(),
+ tbl
+ )
+
+ # dplyr::case_when() errors if values on right side of formulas do not have
+ # exactly the same type, but the Arrow case_when kernel allows compatible
types
+ expect_equal(
+ tbl %>%
+ mutate(i64 = as.integer64(1e10)) %>%
+ Table$create() %>%
+ transmute(cw = case_when(
+ is.na(fct) ~ int,
+ is.na(chr) ~ dbl,
+ TRUE ~ i64
+ )) %>%
+ collect(),
+ tbl %>%
+ transmute(
+ cw = ifelse(is.na(fct), int, ifelse(is.na(chr), dbl, 1e10))
+ )
+ )
+
+ # expected errors (which are caught by abandon_ship() and changed to
warnings)
+ # TODO: Find a way to test these directly without abandon_ship() interfering
Review comment:
For the zero-cases error, yes, that would work. But for the other errors
I don't think it would.
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