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| author | Teodor Sigaev <teodor@sigaev.ru> | 2016-06-27 20:41:00 +0300 |
|---|---|---|
| committer | Teodor Sigaev <teodor@sigaev.ru> | 2016-06-27 20:41:00 +0300 |
| commit | 028350f619f7688e0453fcd2c4b25abe9ba30fa7 (patch) | |
| tree | 5381d262fe10bf48a855ba92f50265a7f1c8a94c /doc/src | |
| parent | f1993038a4f0ce5fbeb7b562b2acd571bf6b567b (diff) | |
Make exact distance match for FTS phrase operator
Phrase operator now requires exact distance betweens lexems instead of
less-or-equal.
Per discussion c19fcfec308e6ccd952cdde9e648b505@mail.gmail.com
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/textsearch.sgml | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/doc/src/sgml/textsearch.sgml b/doc/src/sgml/textsearch.sgml index 9028bedd1bb..72bef9f49e7 100644 --- a/doc/src/sgml/textsearch.sgml +++ b/doc/src/sgml/textsearch.sgml @@ -346,10 +346,10 @@ SELECT to_tsvector('error is not fatal') @@ to_tsquery('fatal <-> error'); There is a more general version of the FOLLOWED BY operator having the form <literal><<replaceable>N</>></literal>, - where <replaceable>N</> is an integer standing for the greatest distance + where <replaceable>N</> is an integer standing for the exact distance allowed between the matching lexemes. <literal><1></literal> is the same as <literal><-></>, while <literal><2></literal> - allows one other lexeme to optionally appear between the matches, and so + allows one other lexeme to appear between the matches, and so on. The <literal>phraseto_tsquery</> function makes use of this operator to construct a <literal>tsquery</> that can match a multi-word phrase when some of the words are stop words. For example: @@ -1529,7 +1529,7 @@ SELECT to_tsquery('fat') <-> to_tsquery('cat | rat'); <para> Returns a query that searches for a match to the first given query followed by a match to the second given query at a distance of at - most <replaceable>distance</replaceable> lexemes, using + <replaceable>distance</replaceable> lexemes, using the <literal><<replaceable>N</>></literal> <type>tsquery</> operator. For example: |