amaliujia commented on code in PR #38415:
URL: https://github.com/apache/spark/pull/38415#discussion_r1007553459
##########
connector/connect/src/main/protobuf/spark/connect/relations.proto:
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@@ -47,6 +47,13 @@ message Relation {
Unknown unknown = 999;
}
+ // Optional. Every relation might have an alias.
+ Alias alias = 200;
+
+ // Relation alias.
+ message Alias {
Review Comment:
do you think if we need to care client call `xx.as("")`? Does client side
should reject this? If so we can just use a string.
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