diqiu50 opened a new pull request, #13785:
URL: https://github.com/apache/gravitino/pull/13785

   ### What changes were proposed in this pull request?
   
   Clarify in `docs/trino-connector/authentication.md` that with 
`iceberg.rest-catalog.session=USER`
   the Iceberg REST server (IRC) is reached with the end user's token only:
   
   - Sessions without a forwarded token cannot access tables, although the 
catalog is still listed.
     On open-source Trino this applies to every OAuth2 sign-in.
   - The token is read from the `token` extra-credential key only.
   - The privileges the forwarded user needs.
   
   ### Why are the changes needed?
   
   The docs describe a service-identity fallback for sessions without a 
forwarded token, but it only
   applies to Gravitino metadata requests, not to the IRC.
   
   ### Does this PR introduce _any_ user-facing change?
   
   No, documentation only.
   
   ### How was this patch tested?
   
   Documentation only.
   


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