nealrichardson commented on a change in pull request #11373:
URL: https://github.com/apache/arrow/pull/11373#discussion_r727314172
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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:
Yeah, R supports negative `n` and does different things with it but
that's not trivial for us/I don't want to deal with it now (also this is an old
comment, just relocated in this PR)
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