grundprinzip commented on code in PR #38166:
URL: https://github.com/apache/spark/pull/38166#discussion_r990983152


##########
connector/connect/src/main/protobuf/spark/connect/relations.proto:
##########
@@ -107,15 +107,17 @@ message Join {
   }
 }
 
-// Relation of type [[Union]], at least one input must be set.
-message Union {
+// Relation of type [[SetOperation]]
+message SetOperation {

Review Comment:
   Of course union supports `ALL`. Not sure why we would need three plans for 
this?



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