jonkeane commented on code in PR #44971:
URL: https://github.com/apache/arrow/pull/44971#discussion_r2071567041


##########
r/tests/testthat/test-dplyr-funcs-math.R:
##########
@@ -399,3 +493,19 @@ test_that("sqrt()", {
     df
   )
 })
+
+test_that("expm1()", {
+  skip_if_arrow_version_less_than("18.1.0.9000", "`expm1()` not available 
until version 19.")

Review Comment:
   We do test across versions of libarrow (maybe that failed when you were 
looking at this? It doesn't look like it from the commit history, but maybe I'm 
missing it), though looking at the discussion in 
https://github.com/apache/arrow/issues/43623 it looks like no one is interested 
in maintaining + teaching folks about libarrow cross compatibility such that 
it's worth it to keep that job + the maintenance cost of that. 
   
   I'll try removing / reverting in my other PR and see though



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