On 30/10/2007, Oleg Bartunov <oleg@sai.msu.su> wrote:
> ok, then you have to formalize many things - how long should be excerpts,
> how much excerpts to show, etc. In tsearch2 we have get_covers() function,
> which produces all excerpts like:
>
> =# select get_covers(to_tsvector('1 2 3 4 5 3 4 abc x y z 2 3'), '2&3'::tsquery);
> get_covers
> ------------------------------------------------
> 1 {1 2 3 }1 4 5 {2 3 4 abc x y z {3 2 }2 3 }3
> (1 row)
This function generates the lexemes, so cannot be used directly, but
it is probably a good starting point.
> Once you formalize your requirements, you can look on it and adapt to your
> needs (and share with people). I think it could be nice contrib module.
It seems that Sushant already wants to implement this function. He
would probably be faster than me :-) (I'm relatively new to db stuff).
Since I mainly rely on whatever a web hosting company provides, I'll
probably stick with a Python implementation outside the SQL query.
Thanks for your answers.
--
Catalin
