Re: [PATCHES] updated hash functions for postgresql v1

Hannu Krosing <hannu@2ndQuadrant.com> writes:
> I had never checked the docs for hash functions, but I had assumed, that
> internal functions are prefixed by pg_ and anything else is public, free
> to use functionality.

Sure, it's free to use.  It's not free to assume that we promise never
to change it.

> Changing hash functions also makes in-place upgrades a lot harder, as
> they can't be done incrementally anymore for tables which use hash
> indexes.

Hash indexes are so far from being production-grade that this argument
is not significant.
        regards, tom lane