GitHub user ostinru edited a comment on the discussion: [Proposal] Iceberg 
subsystem for datalake_fdw — design proposal

> Making Catalog and Volume two separate FDWs, each with its own Server / 
> UserMapping, lets us cover every combination without inventing a new FDW for 
> each.

If I am not mistaken - there is no way to `CREATE USER MAPPING` for ROLE (group 
of users) - only PUBLIC or explicitly for each user in the group. This may 
force DBAs to conduct more work than you would expect.

There were discussion for Multi-Catalog support for Cloudberry (may be there 
are some useful thoughts)
https://github.com/apache/cloudberry/discussions/1297

GitHub link: 
https://github.com/apache/cloudberry/discussions/1683#discussioncomment-16634142

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