ts_headline calls ts_lexize equivalent to break the text. Off course there is algorithm to process the tokens and generate the headline. I would be really surprised if the algorithm to generate the headline is somehow dependent on language (as it only processes the tokens). So Oleg is right when he says ts_lexize is something to be checked.
I will try to replicate what you are trying to do but in the meantime can you run the same ts_headline under psql multiple times and paste the result. -Sushant. 2009/11/19 Wojciech Knapik <webmas...@wolniartysci.pl> > > Oleg Bartunov wrote: > > Yes, for 4-word texts the results are similar. >>> Try that with a longer text and the difference becomes more and more >>> significant. For the lorem ipsum text, 'polish' is about 4 times slower, >>> than 'english'. For 5 repetitions of the text, it's 6 times, for 10 >>> repetitions - 7.5 times... >>> >> >> Again, I see nothing unclear here, since dictionaries (as specified >> in configuration) apply to ALL words in document. The more words in >> document, the more overhead. >> > > You're missing the point. I'm not surprised that the function takes more > time for larger input texts - that's obvious. The thing is, the computation > times rise more steeply when the Polish config is used. Steeply enough, that > the difference between the Polish and English configs becomes enormous in > practical cases. > > Now this may be expected behaviour, but since I don't know if it is, I > posted to the mailing lists to find out. If you're saying this is ok and > there's nothing to fix here, then there's nothing more to discuss and we may > consider the thread closed. > If not, ts_headline deserves a closer look. > > cheers, > Wojciech Knapik > > > -- > Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-hackers >
