| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Teodor Sigaev <teodor(at)sigaev(dot)ru> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Phrase search distance syntax |
| Date: | 2016-09-23 14:23:16 |
| Message-ID: | 13118.1474640596@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Teodor Sigaev <teodor(at)sigaev(dot)ru> writes:
>> Why does the phrase distance operator assume <1> means adjacent words,
>> and not <0>. (FYI, <-> is the same as <1>.)
> Because
> 1 it is a result of subtruction of word's positions
> 2 <0> could be used as special case like a word with two infinitives:
This is actually documented, in 12.1.2:
A special case that's sometimes useful is that <0> can be used to
require that two patterns match the same word.
regards, tom lane