Github user actuaryzhang commented on a diff in the pull request:
https://github.com/apache/spark/pull/18025#discussion_r122358689
--- Diff: R/pkg/R/generics.R ---
@@ -919,10 +920,9 @@ setGeneric("array_contains", function(x, value) {
standardGeneric("array_contain
#' @export
setGeneric("ascii", function(x) { standardGeneric("ascii") })
-#' @param x Column to compute on or a GroupedData object.
--- End diff --
In this case, we will have to document `avg` on its own, like `count`,
`first` and `last`. I cannot document the `x` param here since it will show up
in the doc for the column class. Interestingly, there is not even a doc of the
`avg` method from the `GroupedData` class....
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