Dean Rasheed <dean.a.rasheed@gmail.com> writes:
> The point with an OID array is that you wouldn't need to store the
> enumsortorder values at all. The sort order would just be the index of
> the OID in the array. So the comparison code would read the OID array,
> traverse it building an array of enum_sort structs {oid, idx}, sort
> that by OID and cache it.
Hmm. But I guess we'd have to keep that array in the pg_type row,
and it'd be a huge PITA to work with at the SQL level. For instance,
psql and pg_dump can easily be adapted to use enumsortorder instead
of pg_enum.oid when they want to read out the labels in sorted order.
Doing the same with an array representation would be a very different
and much uglier query. I'm not eager to contort the catalog
representation that much.
regards, tom lane