On Sat, 8 Mar 2008, Tom Lane wrote:
> Oleg Bartunov <oleg@sai.msu.su> writes:
>> On Sat, 8 Mar 2008, Jan Urbaski wrote:
>>> I have a feeling that in many cases identifying the top 50 to 300 lexemes
>>> would be enough to talk about text search selectivity with a degree of
>>> confidence. At least we wouldn't give overly low estimates for queries
>>> looking for very popular words, which I believe is worse than givng an overly
>>> high estimate for a obscure query (am I wrong here?).
>
>> Unfortunately, selectivity estimation for query is much difficult than
>> just estimate frequency of individual word.
>
> It'd be an oversimplification, sure, but almost any degree of smarts
> would be a huge improvement over what we have now ...
yes, given that the most popular queries are just one-word long.
Regards, Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83