hvanhovell commented on code in PR #40270:
URL: https://github.com/apache/spark/pull/40270#discussion_r1127821694


##########
connector/connect/common/src/main/protobuf/spark/connect/relations.proto:
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@@ -781,3 +782,10 @@ message FrameMap {
   CommonInlineUserDefinedFunction func = 2;
 }
 
+message WithSequenceColumn {

Review Comment:
   My main point is that we should not be polluting the protocol with something 
that is essentially a projection.
   
   What honestly makes things worse is, that the thing you are adding, is 
subtilely broken. Once this is out in the open other implementations can and 
generally will use it, and may run into the same bugs. We really have to be 
prudent here.



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