Neil Conway wrote:

I'm still unconvinced that this feature would be sufficiently useful to
justify the maintenance burden, in addition to the added complexity:
even if it is implemented in a way that imposes minimal *runtime*
overhead, new features add complexity: introducing a bunch of new DDL
commands and a new concept ("synonyms") makes the system more difficult
for users to understand.

Synonyms appear to me a little like domains. I like them to abstract from proprietary data types. Similar, leightweight synonyms (pg_class entries) allow some abstraction if needed, without using rules. I don't think that synonyms are more difficult to understand than domains.


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