Github user NarineK commented on a diff in the pull request:
https://github.com/apache/spark/pull/12836#discussion_r64983139
--- Diff: R/pkg/R/deserialize.R ---
@@ -197,6 +197,31 @@ readMultipleObjects <- function(inputCon) {
data # this is a list of named lists now
}
+readMultipleObjectsWithKeys <- function(inputCon) {
+ # readMultipleObjectsWithKeys will read multiple continuous objects from
+ # a DataOutputStream. There is no preceding field telling the count
+ # of the objects, so the number of objects varies, we try to read
+ # all objects in a loop until the end of the stream. The rows in
+ # the stream are separated by grouping-key boundary
+ data <- list()
+ subData <- list()
+ while (TRUE) {
+ # If reaching the end of the stream, type returned should be "".
+ type <- readType(inputCon)
+ if (type == "") {
+ break
+ } else if (type == "r") {
+ # key boundary detected
+ readTypedObject(inputCon, type)
--- End diff --
it is actually a boundary separator not the key we used to refer in :
https://github.com/NarineK/spark/blob/9cacd4dbfa0e20d2a855e23f2962a258abbba553/R/pkg/inst/worker/worker.R#L94
No, it is not being used internally, it is a separator(to mark the group
boundaries)
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