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 ...
regards, tom lane
