xinrong-meng commented on code in PR #45614:
URL: https://github.com/apache/spark/pull/45614#discussion_r1532525957
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connector/connect/common/src/main/protobuf/spark/connect/relations.proto:
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@@ -131,6 +132,23 @@ message SQL {
repeated Expression pos_arguments = 5;
}
+// Relation of type [[WithRelations]].
+//
+// This relation contains a root plan, and one or more references that are
used by the root plan.
+// There are two ways of referencing a relation, by name (through a subquery
alias), or by plan_id
+// (using RelationCommon.plan_id).
+//
+// This relation can be used to implement CTEs, describe DAGs, or to reduce
tree depth.
+message WithRelations {
Review Comment:
May I ask which APIs are associated with the relation?
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