Hi Surya,

> A few suggestions:
> In vacuum.c:
> 1) The header comment on vacuum_is_permitted_for_relation() still describes 
> only the permission-check path.  
> Now that the function also signals "relation no longer exists", the header 
> should mention both cases.
> 2) A one-line comment at the pg_class_aclcheck_ext() call explaining why the 
> _ext variant is needed (concurrent drop in the whole-database
> list-construction path) would help future readers, and guard against a 
> cleanup patch that silently reverts to pg_class_aclcheck().

Fixed.

> In vacuum_concurrent_drop.spec:
> 1) The spec sets "client_min_messages = ERROR", which suppresses the very 
> WARNING the patch emits.
> Let's have the client_min_messages to WARNING, so we see the warning in the 
> .out file.

Fixed. We need to grant pg_maintain to regress_vacuum to avoid "permission 
denied ..."
warnings. For versions (< 17) which don't have pg_maintain role, we may still 
want to use
"client_min_messages = ERROR".

> 2) Minor comment, maybe adding the ANALYZE permutation (or a sibling spec) 
> would test that code path too. (Not a mandatory thing but a good to have)

Fixed.

--
Regards,
ChangAo Chen

Attachment: v3-0001-Handle-concurrent-drop-when-doing-whole-database-.patch
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Attachment: v3-0002-Add-test-case-for-vacuum-with-a-concurrent-drop.patch
Description: Binary data

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