Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21255#discussion_r186604950
--- Diff: R/pkg/tests/fulltests/test_sparkSQL.R ---
@@ -1748,6 +1748,14 @@ test_that("string operators", {
collect(select(df5, repeat_string(df5$a, -1)))[1, 1],
""
)
+
+ l6 <- list(list(a = "abc"))
+ df6 <- createDataFrame(l6)
+ df7 <- select(df6, reverse(df6$a))
--- End diff --
`df7` is not used below?
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