ericm-db commented on code in PR #54098:
URL: https://github.com/apache/spark/pull/54098#discussion_r2771672003
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala:
##########
@@ -633,6 +633,86 @@ case class Union(
copy(children = newChildren)
}
+/**
+ * Logical plan for unioning multiple plans sequentially, processing each
child to completion
+ * before moving to the next. This is used for backfill-to-live streaming
scenarios where
+ * historical data should be processed completely before switching to live
data.
Review Comment:
Done
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