[Xapian-devel] Re: [Xapian-discuss] Searching subset of documents

[Rusty Conover]

On Jun 2, 2006, at 3:15 AM, James Aylett wrote:

> On Fri, Jun 02, 2006 at 02:01:13AM +0100, Olly Betts wrote:
>
>>     class MySQLFilter : public Xapian::ExternalPostingSource;
>>
>>     Xapian::QueryParser qp;
>>     // configure qp
>>     Xapian::Query query = qp.parse_query(query_string);
>>     Xapian::Query sql_filter(new MySQLFilter(/* some parameters */));
>
> Surely the type will be Xapian::ExternalPostingSource, not  
> Xapian::Query?
>
>>     query = Xapian::Query(OP_FILTER, query, sql_filter);

Olly and others,

Please disregard my previous email, after some hours of hacking I got  
it all working, I think. Including a nice wrapper in perl with  
Search::Xapian.  I'll try and clean it up and send a diff later today  
after I finish testing it for a while.

I did have to hack the Xapian::Query object to add a new OP type of  
OP_EXTERNAL_POST_LIST, and store a reference to the implementation of  
the ExternalPostingSource interface in the Internal class.  Then some  
changes in localmatch.cc, to have postlist_from_query just create a  
new instance of ExternalSourcePostList with the reference to the  
implementation provided to the Query constructor.

Thanks for all of your help,

Rusty
--
Rusty Conover
InfoGears Inc.
Web: http://www.infogears.com