dimas-b commented on code in PR #10877:
URL: https://github.com/apache/iceberg/pull/10877#discussion_r1709441061


##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -222,7 +222,8 @@ paths:
           description:
             An optional namespace, underneath which to list namespaces.
             If not provided or empty, all top-level namespaces should be 
listed.
-            If parent is a multipart namespace, the parts must be separated by 
the unit separator (`0x1F`) byte.
+            If parent is a multipart namespace, the parts must be separated by 
the namespace separator as
+            indicated via the /config override `rest-namespace-separator`, 
which defaults to the unit separator (`0x1F`) byte.

Review Comment:
   This approach will break old client in environments where the server is able 
to accept the non-printable separator, but chooses to use an alternative 
separator.
   
   So, the upgrade path for users would be to first upgrade clients, then use 
new servers. As for me, it can be a significant burden on users. Also, this 
will require that new clients be API-compatible with older servers during the 
transition period... WDYT?



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