Github user felixcheung commented on a diff in the pull request: https://github.com/apache/spark/pull/14779#discussion_r76000716 --- Diff: R/pkg/R/functions.R --- @@ -3200,19 +3212,27 @@ setMethod("lag", #' This is equivalent to the \code{LEAD} function in SQL. #' #' @param x Column to compute on -#' @param offset Number of rows to offset +#' @param offset Number of rows to offset. If not specified, the default is 1. --- End diff -- perhaps explain more what offset/defaultValue will do like in Python?
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