Re: Support EXCEPT for TABLES IN SCHEMA publications

A couple of comments for v24-0001

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Commit message.

1.
Extend table exclusion support in publications to allow specific
tables to be excluded from schema-level publications using an
EXCEPT clause in CREATE PUBLICATION.

Supported syntax:
CREATE PUBLICATION <pub> FOR TABLES IN SCHEMA s EXCEPT (TABLE t1,...);

~

1a.
Change /<pub>/pub/

~

1b.
Now that you are combining more patches, this commit message seemed a
bit light on details.

You might say include things like:

NOTES
- Conflicting or redundant EXCEPT clauses are not allowed
- EXCEPT clause tables must come from the associate schema
- psql describe commands are updated handle tables excluded from schemas
- Excluding partitions in not allowed
- Excluding a partition root excludes the entire partition tree, even
tables in different schemas
- etc.

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src/backend/utils/cache/relcache.c

RelationBuildPublicationDesc:

1.
+ /* Drop the publications that exclude this relation. */
+ if (exceptpuboids != NIL)
+ puboids = list_difference_oid(puboids, exceptpuboids);
+

AFAIK, there is no DROP PUBLICATION in this logic.

Instead of "Drop", how about "Ignore" or "Skip" to remove any ambiguity.

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Kind Regards,
Peter Smith.
Fujitsu Australia