Xapian devel - May 2004 - Re: [Xapian-commits] Changes in xapian/xapian-applications/queryserver/ xapian/xapian-applications/queryserver/source/

On Tue, May 11, 2004 at 05:41:58PM +0100, Richard Boulton
wrote:
> * If the queryserver can't parse a query, strip out all special
>   characters, and then retry.  This means that we get some kind of
>   result even if the query is broken.
That's probably a feature worth pushing down into Xapian::QueryParser...

Cheers,
    Olly

On Tue, May 11, 2004 at 06:30:47PM +0100, Olly Betts
wrote:
> On Tue, May 11, 2004 at 05:41:58PM +0100, Richard Boulton wrote:
> > * If the queryserver can't parse a query, strip out all special
> >   characters, and then retry.  This means that we get some kind of
> >   result even if the query is broken.
> 
> That's probably a feature worth pushing down into
Xapian::QueryParser...
I've now done this.  It's essentially the same as the queryserver patch,
except that "@" is also stripped.  It seems arbitrary to leave
"@" but
to strip other phrase generators (especially "'" as then
contractions
such as "isn't" get broken up).  As it is now it works well on the
sample of real world queries from tweakers.net, whereas not stripping
*any* phrase generators seems to do slightly less well.

I think this is something to revisit after this is addressed:

http://www.xapian.org/cgi-bin/bugzilla/show_bug.cgi?id=22

Thoughts?

Cheers,
    Olly

On Tue, May 11, 2004 at 06:30PM, Olly Betts wrote:
> That's probably a feature worth pushing down into
Xapian::QueryParser...
What is ::QueryParser? The name would suggest it takes strings (say of
the form 'hotel AND (beach OR "swimming pool")' and converts
them into
::Query objects. Is this correct (I can't see any reference to the class
in the API docs)?

I'm doing a fair amount of hacking on the Perl bindings atm, and it
occurs to me that this would be a useful feature, even if I have to do
it in the perl wrapper. IIrc, the python bindings do something similar -
do they just use ::QueryParser under the hood?

-- 
Alex Bowley                                           http://hyperspeed.org/
"Written laws are like spider's webs; they will catch, it is true, the
weak
 and the poor, but would be torn in pieces by the rich and powerful."
                                                               - Anarcharsis