Re: ts_headline

From: Richard Huxton <dev(at)archonet(dot)com>
To: Stephen Davies <scldad(at)sdc(dot)com(dot)au>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: ts_headline
Date: 2008-02-21 09:38:05
Message-ID: 47BD467D.7010407@archonet.com
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Stephen Davies wrote:
> G'day Richard.
>
> I don't think so. A sample command is:
>
> ts_headline(abstract,to_tsquery('english','database'),'minWords = 99, maxWords
> = 999')
>
> I have also tried with smaller maxwords without any visible effect.

Hmm - a simple test seems to work OK.

SELECT ts_headline( repeat('apple banana carrot ', 100),
to_tsquery('apple'));
ts_headline
----------------------------------------------------------------------------------------------------------------------------------------
<b>apple</b> banana carrot <b>apple</b> banana carrot <b>apple</b>
banana carrot <b>apple</b> banana carrot <b>apple</b> banana carrot
(1 row)

It's not just the start of the text either:

SELECT ts_headline( repeat('elephant ', 100) || repeat('apple banana
carrot ', 100), to_tsquery('apple'));
ts_headline
----------------------------------------------------------------------------------------------------------------------------------------
<b>apple</b> banana carrot <b>apple</b> banana carrot <b>apple</b>
banana carrot <b>apple</b> banana carrot <b>apple</b> banana carrot
(1 row)

Can you provide a piece of text that shows the problem?

--
Richard Huxton
Archonet Ltd

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