hvanhovell commented on code in PR #48791:
URL: https://github.com/apache/spark/pull/48791#discussion_r1876966173


##########
sql/connect/common/src/main/protobuf/spark/connect/relations.proto:
##########
@@ -97,13 +98,60 @@ message Relation {
     // Catalog API (experimental / unstable)
     Catalog catalog = 200;
 
+    // ML relation
+    MlRelation ml_relation = 300;
+
     // This field is used to mark extensions to the protocol. When plugins 
generate arbitrary
     // relations they can add them here. During the planning the correct 
resolution is done.
     google.protobuf.Any extension = 998;
     Unknown unknown = 999;
   }
 }
 
+// Relation to represent ML world
+message MlRelation {

Review Comment:
   What is the benefit of adding MLRelation? Why not add the two  MLRelations 
to the Relations message.



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