| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Mark <Marek(dot)Balgar(at)seznam(dot)cz> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>, Teodor Sigaev <teodor(at)sigaev(dot)ru> |
| Subject: | Re: ts_rank |
| Date: | 2011-09-11 02:18:44 |
| Message-ID: | 201109110218.p8B2Iik21211@momjian.us |
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| Lists: | pgsql-hackers |
Mark wrote:
> >There's some potentially useful information here:
> >http://www.postgresql.org/docs/9.0/interactive/textsearch-controls.html#TEXTSEARCH-RANKING
>
> Thanks for reply. I was reading the documentation of PostgreSQL, but there
> it is not written the name of the used methods. Everywhere there is written,
> that ts_rank use standard ranking function. But it is difficult to say which
> is the standard function.
> Somewhere I found that it is maybe based on Vector space model and it seems
> to be truth, because in the code of tsrank.c is counted the frequency of
> words, but I am not sure of that :-(
Oleg, Teodor, can you give me a description of how ts_rank decided how
to rank items? Thanks.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
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