On 14/02/11 07:38, Artur Zając wrote:
I had almost the same problem.
To resolve it, I created my own text search parser (myftscfg) which divides
text in column into three letters parts, for example:
someemail@xxxxxxxxxx is divided to som, ome,mee,eem,ema,mai,ail,il@,
l@d,@do,dom,oma,mai,ain,in.,n.c,.co,com
There should be also index on email column:
CREATE INDEX "email _fts" on mytable using gin
(to_tsvector('myftscfg'::regconfig, email))
Every query like email ilike '%domain.com%' should be rewrited to:
WHERE
to_tsvector('myftscfg',email) @@ to_tsquery('dom') AND
to_tsvector('myftscfg',email) @@ to_tsquery('oma') AND
to_tsvector('myftscfg',email) @@ to_tsquery('mai') AND
...
Looks like you've almost re-invented the trigram module:
http://www.postgresql.org/docs/9.0/static/pgtrgm.html
--
Richard Huxton
Archonet Ltd
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