[Ferret-talk] Wildcard trouble

[Jens Kraemer]

Hi Paul,

On 07.01.2009, at 01:17, Paul Lynch wrote:

> Hi-- I just ran into an odd situation.  If I do a search including  
> the term:
>         c*  -  I get 4 hits
>         ca* - I get the same 4 documents
>         co* - I get one new document, not found by c*
>
> Does anyone know what might be going on, or have suggestions for  
> debugging?

How does your full query look like? Ferret has a built in default  
limit of 512 for the number of terms wildcard queries (and other  
MultiTermQueries) can get expanded to. Any more terms matching your  
criteria will be dropped then, keeping the most relevant 512 terms.
You can override this value by specifying a max_terms value when  
constructing the query via the API:

query = WildcardQuery.new(:field, "c*",
                           :max_terms => 1024)

you might also try monkey patching the  
Ferret::Search::MultiTermQuery::default_max_terms method to return  
your custom limit so you dont need to use the query API to construct  
your queries (i.e. with aaf which doesn't reliably work with query  
objects due to the DRb stuff involved).

It *might* also be a bug in Ferret - if the above doesn't help, can  
you reproduce this with a simple test case?

cheers,
Jens

--
Jens Krämer
Finkenlust 14, 06449 Aschersleben, Germany
VAT Id DE251962952
http://www.jkraemer.net/ - Blog
http://www.omdb.org/     - The new free film database

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