On Mon, Jun 26, 2017 at 10:54 AM, Michael Paquier
<michael.paqu...@gmail.com> wrote:
> On Fri, Jun 23, 2017 at 11:17 AM, Amit Langote
> <langote_amit...@lab.ntt.co.jp> wrote:
>> That was it, thanks for the pointer.
> GinInitMetabuffer() sets up pd_lower and pd_upper anyway using
> PageInit so the check of PageIsVerified is guaranteed to work in any
> case. Upgraded pages will still have their pd_lower set to the
> previous values, and new pages will have the optimization. So this
> patch is actually harmless for past pages, while newer ones are seen
> as more compressible.
>> Attached updated patch, which I confirmed, passes wal_consistency_check = 
>> gin.
> I have spent some time looking at this patch, playing with pg_upgrade
> to check the state of the page upgraded. And this looks good to me.
> One thing that I noticed is that this optimization could as well
> happen for spgist meta pages. What do others think?

Good point. I think it could happen for brin meta page as well.


Masahiko Sawada
NTT Open Source Software Center

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