dragosmg commented on code in PR #13541:
URL: https://github.com/apache/arrow/pull/13541#discussion_r927523461
##########
r/R/query-engine.R:
##########
@@ -259,9 +260,39 @@ ExecPlan <- R6Class("ExecPlan",
...
)
},
+ # SinkNodes (involved in arrange and/or head/tail operations) are created
in
+ # ExecPlan_run and are not captured by the regular print method. We take a
+ # similar approach to expose them before calling the print method.
+ BuildAndShow = function(node) {
+ assert_is(node, "ExecNode")
+
+ # Sorting and head/tail (if sorted) are handled in the SinkNode,
+ # created in ExecPlan_run
+ sorting <- node$extras$sort %||% list()
+ select_k <- node$extras$head %||% -1L
+ has_sorting <- length(sorting) > 0
+ if (has_sorting) {
+ if (!is.null(node$extras$tail)) {
+ # Reverse the sort order and take the top K, then after we'll reverse
+ # the resulting rows so that it is ordered as expected
+ sorting$orders <- !sorting$orders
+ select_k <- node$extras$tail
+ }
+ sorting$orders <- as.integer(sorting$orders)
+ }
Review Comment:
Done.
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