> to use it when the AM can't guarantee to return the same sequence of
> tuples after backing up. So I think it would be sufficient to have
> gistmarkpos et al throw error if called.
Why not to remove gistrestrpos/gistmarkpos/ginrestrpos/ginmarkpos from pg_am table?
--
Teodor Sigaev E-mail: teodor@sigaev.ru
WWW: http://www.sigaev.ru/