Re: GIN needs tonic

Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> Tom Lane wrote:
>> Actually, the entire thing is misdesigned from the get-go. AFAICS
>> it shouldn't even have its own WAL record type --- it should be using
>> log_newpage().

> Yeah, that would be even simpler. The WAL records it currenctly writes
> are more compact, but then again it probably makes no difference in
> practice.

I'm working on this now. It looks to me like there are a number of bugs
in this code, notably I think that the accounting for free space on
GinList pages is failing to allow for alignment effects.

One difficulty in using log_newpage() directly is that it presently
assumes that the page it's passed has been built in private memory,
not in a shared buffer. I'm not sure if it's worth restructuring the
GIN code to do it that way.

regards, tom lane