Github user jaceklaskowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/21316#discussion_r187899299
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -1607,7 +1607,9 @@ class Dataset[T] private[sql](
*/
@Experimental
@InterfaceStability.Evolving
- def reduce(func: (T, T) => T): T = rdd.reduce(func)
+ def reduce(func: (T, T) => T): T = withNewExecutionId {
--- End diff --
@maropu When you asked about this API did you refer to `reduce` or
`withNewExecutionId`?
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