Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21255#discussion_r186369103
  
    --- Diff: R/pkg/R/functions.R ---
    @@ -209,6 +209,7 @@ NULL
     #' head(select(tmp, array_max(tmp$v1), array_min(tmp$v1)))
     #' head(select(tmp, array_position(tmp$v1, 21)))
     #' head(select(tmp, flatten(tmp$v1)))
    +#' head(select(tmp, reverse(tmp$v1)))
    --- End diff --
    
    Also add `concat` here?


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