This might seem like a silly question, but what are the implications of
PostgreSQL allowing developers to create custom catalogs?
For example, PostgreSQL currently uses the pg_catalog schema to store
system catalogs / relations / functions / etc. Has thought gone into
extending the scope to allow contrib modules to create their own
catalogs (ie. a PostGIS catalog, cube, tsearch2, etc.)?
The largest advantage I see is significantly easier upgrades. Having
contrib tables/functions flagged as a catalog, pg_dump won't include
them in a dump - restoring into an upgraded database becomes painless.
Cheers,
Kevin
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