Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17770#discussion_r117687634
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -1741,7 +1743,8 @@ class Dataset[T] private[sql](
def union(other: Dataset[T]): Dataset[T] = withSetOperator {
// This breaks caching, but it's usually ok because it addresses a
very specific use case:
// using union to union many files or partitions.
- CombineUnions(Union(logicalPlan, other.logicalPlan))
+ CombineUnions(Union(EliminateBarriers(logicalPlan),
EliminateBarriers(other.logicalPlan)))
+ .mapChildren(AnalysisBarrier)
--- End diff --
This looks a bit ugly. But the barrier will prevent `CombineUnions` work
normally.
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