Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/11517#discussion_r55475367
--- Diff:
core/src/main/scala/org/apache/spark/util/random/RandomSampler.scala ---
@@ -41,6 +41,12 @@ trait RandomSampler[T, U] extends Pseudorandom with
Cloneable with Serializable
/** take a random sample */
def sample(items: Iterator[T]): Iterator[U]
+ /**
+ * Whether to sample the next item or not.
+ * Return how many times the next item will be sampled. Return 0 if it
is not sampled.
+ */
+ def sample(): Int
+
--- End diff --
These changes on `RandomSampler` is submitted in #11578.
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