Re: UNIQUE capability to hash indexes

On 02/04/2016 11:34 PM, Tom Lane wrote:
> Alvaro Herrera <alvherre@2ndquadrant.com> writes:
>> This is really strange though.  Surely adding WAL-logging is not an
>> enormous task anymore ... I mean, we're undertaking far larger efforts
>> now, the WAL logging code is simpler than before, and we even have a
>> tool (ok, gotta streamline that one a little bit) to verify that the
>> results are correct.
>
> ISTR that we discussed this previously and ran into some stumbling block
> or other that made it less-than-trivial.  Don't recall what though.

The last discussion I can recall was Robert's ideas on how to solve the 
splitting of buckets.

http://www.postgresql.org/message-id/CA+TgmoZyMoJSrFxHXQ06G8jhjXQcsKvDiHB_8z_7nc7hj7iHYQ@mail.gmail.com

Andreas