Antonin Houska <ah(at)cybertec(dot)at> writes:
> While checking how BM_PERMANENT flag is set (in buffer header), I noticed that
> hash index has it set too. Shouldn't pg_class(relpersistence) be 'u' in this
> case?
See archives; we do not currently have a way to support unlogged indexes
on logged tables. The whole hash-index mess would be better if we did,
but getting there is less than trivial.
regards, tom lane