Re: [GENERAL] Fragments in tsearch2 headline

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: sushant354(at)gmail(dot)com
Cc: Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>, Teodor Sigaev <teodor(at)sigaev(dot)ru>, Pierre-Yves Strub <pierre(dot)yves(dot)strub(at)gmail(dot)com>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [GENERAL] Fragments in tsearch2 headline
Date: 2009-04-14 01:24:58
Message-ID: 26620.1239672298@sss.pgh.pa.us
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Sushant Sinha <sushant354(at)gmail(dot)com> writes:
> Headline generation uses hlCover to get fragments in text with *all*
> query items. In case there is no such fragment, it does not return
> anything.

> What you are asking will either require returning *maximally* matching
> covers or handling it as a separate case.

Efficiently being useless is still useless --- a headline selection
function needs to be robust, not fragile, and not doing anything useful
for a partial match sounds pretty fragile to me.

regards, tom lane

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