zhengruifeng commented on code in PR #37728:
URL: https://github.com/apache/spark/pull/37728#discussion_r959038961
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core/src/main/scala/org/apache/spark/util/collection/Utils.scala:
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@@ -37,6 +37,23 @@ private[spark] object Utils {
ordering.leastOf(input.asJava, num).iterator.asScala
}
+ /**
+ * Returns an iterator over the merged contents of all given iterators,
+ * traversing every element of the input iterators.
+ * Equivalent entries will not be de-duplicated.
+ *
+ * Callers must ensure that the source iterators are already sorted by
+ * the same ordering `ord`, otherwise the result is likely to be incorrect.
+ */
+ def mergeOrdered[T](iterators: Iterable[TraversableOnce[T]])(
Review Comment:
yeah, let me rename it as `inputs`
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