From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> |
Cc: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: A design for amcheck heapam verification |
Date: | 2017-09-29 17:29:04 |
Message-ID: | CA+TgmoY0tKwisySRCQ0EVZ2gr0znU-bTmqrD2SuJ4eCdGUnABg@mail.gmail.com |
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On Thu, Sep 28, 2017 at 11:34 PM, Thomas Munro
<thomas(dot)munro(at)enterprisedb(dot)com> wrote:
> FWIW I think if I were attacking that problem the first thing I'd
> probably try would be getting rid of that internal pointer
> filter->bitset in favour of a FLEXIBLE_ARRAY_MEMBER and then making
> the interface look something like this:
>
> extern size_t bloom_estimate(int64 total elems, int work_mem);
> extern void bloom_init(bloom_filter *filter, int64 total_elems, int work_mem);
Yes, that seems quite convenient and is by now an established coding pattern.
I am also wondering whether this patch should consider
81c5e46c490e2426db243eada186995da5bb0ba7 as a way of obtaining
multiple hash values. I suppose that's probably inferior to what is
already being done on performance grounds, but I'll just throw out a
mention of it here all the same in case it was overlooked or the
relevance not spotted...
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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