Alvaro Herrera wrote:
I don't, because there are always those that are knowledgeable enough to
know how to reduce space lost to padding.  So it would be nice to have
2-byte enums on-disk, and resolve them based on the column's typid.  But
then, I'm not familiar with the patch at all so I'm not sure if it's

Not with this patch, and AFAIK not possible generally, without writing separate I/O functions for each type. I'd love to be able to do that, but I don't think it's possible currently. The main stumbling block is the output function (and cast-to-text function), because output functions do not get provided the oid of the type that they're dealing with, for security reasons IIRC. It was never clear to me why I/O functions should ever be directly callable by a user (and hence open to security issues), but apparently it was enough to purge any that were designed like that from the system, so I wasn't going to go down that road with the patch.



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