Re: [HACKERS] Boom filters for hash joins (was: A design for amcheckheapam verification) - Mailing list pgsql-hackers

From Peter Geoghegan
Subject Re: [HACKERS] Boom filters for hash joins (was: A design for amcheckheapam verification)
Date
Msg-id CAH2-Wzn+xeU+CsrinrSBj014zmKCicbccAn-WmRe=Xx_VuFBpQ@mail.gmail.com
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In response to Re: [HACKERS] Boom filters for hash joins (was: A design for amcheckheapam verification)  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
Responses Re: [HACKERS] Boom filters for hash joins (was: A design for amcheckheapam verification)  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
List pgsql-hackers
On Tue, Sep 19, 2017 at 6:28 AM, Tomas Vondra
<tomas.vondra@2ndquadrant.com> wrote:
> The patch is fairly simple, and did not try to push the bloom filters to
> scan nodes or anything like that. It might be a meaningful first step,
> though, particularly for selective joins (where only small number of
> rows from the outer relation has a match in the hash table).

I believe that parallelism makes the use of Bloom filter a lot more
compelling, too. Obviously this is something that wasn't taken into
consideration in 2015.


-- 
Peter Geoghegan


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