On 3/24/16 10:27 PM, Tom Lane wrote:
It's conceivable that we could do something like adding an "isdead" column to pg_enum and making enum_in reject new values that're marked isdead. But I can't see that we'd ever be able to support true removal of an enum value at reasonable cost. And I'm not really sure where the use-case argument is for working hard on it.
I wonder if we could handle this by allowing foreign keys on enum columns back to pg_enum. Presumably that means we'd have to treat pg_enum as a regular table and not a catalog table. Due to locking concerns I don't think we'd want to put the FKs in place by default either.
I've certainly heard people avoiding ENUMs because of their limitations, so it'd be nice if there was a way to lift them.
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