Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21255#discussion_r187380148
--- Diff: R/pkg/tests/fulltests/test_sparkSQL.R ---
@@ -1502,12 +1502,25 @@ test_that("column functions", {
result <- collect(select(df, sort_array(df[[1]])))[[1]]
expect_equal(result, list(list(1L, 2L, 3L), list(4L, 5L, 6L)))
- # Test flattern
+ result <- collect(select(df, reverse(df[[1]])))[[1]]
+ expect_equal(result, list(list(3L, 2L, 1L), list(4L, 5L, 6L)))
+
+ df2 <- createDataFrame(list(list("abc")))
+ result <- collect(select(df2, reverse(df2[[1]])))[[1]]
+ expect_equal(result, "cba")
+
+ # Test flattern()
--- End diff --
`flattern` -> `flatten`.
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