Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21255#discussion_r187515152
--- Diff: R/pkg/R/functions.R ---
@@ -2047,18 +2050,8 @@ setMethod("countDistinct",
#' \code{concat}: Concatenates multiple input columns together into a
single column.
#' If all inputs are binary, concat returns an output as binary.
Otherwise, it returns as string.
--- End diff --
ditto.
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