Re: [HACKERS] Surjective functional indexes

On 07.01.2018 01:59, Stephen Frost wrote:
> Greetings,
>
> * Konstantin Knizhnik (k.knizhnik@postgrespro.ru) wrote:
>> On 15.12.2017 01:21, Michael Paquier wrote:
>>> On Fri, Dec 15, 2017 at 6:15 AM, Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
>>>> Konstantin Knizhnik wrote:
>>>>> If you still thing that additional 16 bytes per relation in statistic is too
>>>>> high overhead, then I will also remove autotune.
>>>> I think it's pretty clear that these additional bytes are excessive.
>>> The bar to add new fields in PgStat_TableCounts in very high, and one
>>> attempt to tackle its scaling problems with many relations is here by
>>> Horiguchi-san:
>>> https://www.postgresql.org/message-id/20171211.201523.24172046.horiguchi.kyotaro@lab.ntt.co.jp
>>> His patch may be worth a look if you need more fields for your
>>> feature. So it seems to me that the patch as currently presented has
>>> close to zero chance to be committed as long as you keep your changes
>>> to pgstat.c.
>> Ok, looks like everybody think that autotune based on statistic is bad idea.
>> Attached please find patch without autotune.
> This patch appears to apply with a reasonable amount of fuzz, builds,
> and passes 'make check', at least, therefore I'm going to mark it
> 'Needs Review'.
>
> I will note that the documentation doesn't currently build due to this:
>
> /home/sfrost/git/pg/dev/cleanup/doc/src/sgml/ref/create_index.sgml:302: parser error : Opening and ending tag
mismatch:literal line 302 and unparseable
 
>      <term><literal>recheck_on_update</></term>
>
> but I don't think it makes sense for that to stand in the way of someone
> doing a review of the base patch.  Still, please do fix the
> documentation build when you get a chance.
>
> Thanks!
>
> Stephen
Sorry, issue with documentation is fixed.



-- 
Konstantin Knizhnik
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