Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/17672#discussion_r112504896
--- Diff: R/pkg/R/functions.R ---
@@ -3652,3 +3652,43 @@ setMethod("posexplode",
jc <- callJStatic("org.apache.spark.sql.functions",
"posexplode", x@jc)
column(jc)
})
+
+#' collect_list
+#'
+#' Creates a list of objects with duplicates.
+#'
+#' @param x Column to compute on
+#'
+#' @rdname collect_list
+#' @name collect_list
+#' @family agg_func
--- End diff --
we really should - it's a long standing concern that something like
```
@examples \dontrun{collect_list(df$x)}
```
is not useful at all. At least we should include how this goes into a
select statement, and in some cases what the output looks like. However, with
the number of sql functions we have it's a bit of ongoing work to improve this
and we definitely can use more help on that
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