cloud-fan commented on code in PR #38166:
URL: https://github.com/apache/spark/pull/38166#discussion_r991769532
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connector/connect/src/main/protobuf/spark/connect/relations.proto:
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@@ -108,15 +108,17 @@ message Join {
}
}
-// Relation of type [[Union]], at least one input must be set.
-message Union {
+// Relation of type [[SetOperation]]
+message SetOperation {
repeated Relation inputs = 1;
Review Comment:
shall we require 2 inputs `left` and `right`? Our SQL parser only generates
set operation with 2 children.
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