Re: Tsearch not searching 'Y'

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "sandeep prakash dhumale" <sandy9940(at)rediffmail(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org, pgsql-general(at)postgresql(dot)org
Subject: Re: Tsearch not searching 'Y'
Date: 2010-04-29 14:01:31
Message-ID: 10739.1272549691@sss.pgh.pa.us
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"sandeep prakash dhumale" <sandy9940(at)rediffmail(dot)com> writes:
> I am trying to get tsearch working for my application but I am facing a
> problem when alphabet 'Y' is the in the tsquery.

> # SELECT 'hollywood'::tsvector @@ to_tsquery('holly:*');
> ?column?
> ----------
> f
> (1 row)

You can't use to_tsquery for this sort of thing, because it tries to
normalize the given words:

regression=# select to_tsquery('holly:*');
to_tsquery
------------
'holli':*
(1 row)

If you do this it works:

regression=# SELECT 'hollywood'::tsvector @@ 'holly:*'::tsquery;
?column?
----------
t
(1 row)

So if you want to use prefix matching, don't normalize.

regards, tom lane

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