I wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
>> Tom, any comments? Otherwise I'll go ahead, and commit after a round or
>> two of polishing.
> Sorry for not getting to this sooner --- I'll try to look tomorrow.
I took a look, and I think this is going in the right direction.
We definitely need a test case corresponding to the live bug,
and I think the comments could use more work, and there are some
cosmetic things (I wouldn't add the new struct Hash field at the
end, for instance).
regards, tom lane