Re: Deprecating Hash Indexes

On Sun, Oct 14, 2012 at 9:45 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> * Put WARNINGs in the docs against the use of hash indexes, backpatch
> to 8.3. CREATE INDEX gives no warning currently, though Index Types
> does mention a caution.

I'd be in favor of adding such warnings to the documentation if they
are not there already, and possibly even warning on CREATE INDEX ..
USING hash(). I don't think I'd go so far as to say that we should
imply that they'll be removed in a future release. Given how deeply
intertwined they are with the planner, I doubt that that will happen;
and I think there is enough interest in the technology that it's
likely to eventually be fixed.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company