On Tue, 2007-11-13 at 08:58 +0100, Pavel Stehule wrote:
> On 13/11/2007, Simon Riggs <simon@2ndquadrant.com> wrote:
> > I'm thinking we can have an inlinable function
> >
> > contains(text, text) returns int
> >
> > Return values limited to just 0 or 1 or NULL, as with SQL/MM.
> > It's close to SQL/MM, but not exact.
> >
> > contains(sourceText, searchText) is a macro for
> >
> > case to_tsvector(default_text_search_config, sourceText) @@
> > to_tsquery(default_text_search_config, searchText)
> > when true then 1
> > when false then 0
> > else null
> > end
Better idea:
in-linable function called
create function
contains(sourceText text, searchText text, config text) returns boolean
as $$
to_tsvector(config, sourceText) @@ to_tsquery(config, searchText);
$$ language sql;
so that
SELECT title
FROM pgweb
WHERE contains(body, 'a & b', 'english')
is an indexable, easily readable way of using full text search.
allowing
SELECT to_tsvector('fat cats ate fat rats') @@ to_tsquery('fat & rat');?column?
----------t
to become
SELECT contains('fat cats ate fat rats', 'fat & rat', 'english');?column?
----------t
Proposed changes:
1. Add function contains()
2. Alter docs to show use of contains()
All other @@ features still the same
-- Simon Riggs 2ndQuadrant http://www.2ndQuadrant.com
