nealrichardson commented on a change in pull request #11373:
URL: https://github.com/apache/arrow/pull/11373#discussion_r727322150
##########
File path: r/R/dataset-scan.R
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@@ -143,6 +139,26 @@ Scanner$create <- function(dataset,
#' @export
names.Scanner <- function(x) names(x$schema)
+#' @export
+head.Scanner <- function(x, n = 6L, ...) {
+ assert_that(n > 0) # For now
+ dataset___Scanner__head(x, n)
+}
+
+#' @export
+tail.Scanner <- function(x, n = 6L, ...) {
+ assert_that(n > 0) # For now
Review comment:
It's not a new limitation, it's been there as long as head/tail have
been supported (version 2.0.0, one year ago), hasn't come up yet (at least on
jira, to my knowledge) 🤷
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