| From: | Claudio Freire <klaussfreire(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)2ndquadrant(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Minmax indexes |
| Date: | 2014-06-17 18:22:52 |
| Message-ID: | CAGTBQpapG9Lz8TTFPDVX3dN2ejM7gk5mLHJQa5hzqg5LnoL62w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jun 17, 2014 at 1:04 PM, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
> For me minmax indexes are helpful because they allow to generate *small*
> 'coarse' indexes over large volumes of data. From my pov that's possible
> possible because they don't contain item pointers for every contained
> row.
But minmax is just a specific form of bloom filter.
This could certainly be generalized to a bloom filter index with some
set of bloom&hashing operators (minmax being just one).
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