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From Marcus Herou <marcus.he...@tailsweep.com>
Subject Re: Group by in Lucene ?
Date Wed, 28 Jan 2009 07:11:25 GMT
Hi.

I did partly solve this with Solr with faceting but it does not solve the
quite normally use feature in db's:
num_en_entries = select count distinct(id) from BlogEntry where
language='en'
num_sv_entries = select count distinct(id) from BlogEntry where
language='sv'

it solves however the feature:
select count(id),date from BlogEntry group by date

I now need this feature elsewhere when parsing accesslogs etc so I am
looking into MonetDB, LucidDB and FastBit. Sphinx search seem like they have
something like this:
http://www.sphinxsearch.com/docs/current.html#clustering

Did you ever try a HitCollector ?

//Marcus

On Wed, Dec 5, 2007 at 1:17 PM, ninaS <nina256@gmx.de> wrote:

>
> Hey Marcus,
>
> have you already implemented this feature?
> I'm searching a group by function for lucene, too.
>
> More precisely I need it in Compass, which is built on top of lucene.
>
> I was thinking about using a HitCollector to get only one result per group.
>
> How did you do it?
>
> Cheers,
> Nina
>
>
>
> Marcus Herou-2 wrote:
> >
> > Cool.
> >
> > I'll do since this is a field which I can spend time in.
> >
> > Kindly
> >
> > //Marcus
> > On 11/5/07, Grant Ingersoll <gsingers@apache.org> wrote:
> >>
> >>
> >> On Nov 5, 2007, at 7:49 AM, Marcus Herou wrote:
> >>
> >> > Thanks. They seem to have got real far in the dev cycle on this.
> >> > Seems like
> >> > it will hit the road in Solr 1.3.
> >> >
> >> > However I would really like this feature to be developed for Core
> >> > Lucene,
> >> > how do I start that process?
> >> > Develop it yourself you would say :) I'm serious isn't it a really
> >> > cool and
> >> > useful feature ?
> >>
> >>
> >> We're always open to well-thought out and tested patches.  See the
> >> Wiki for info on contributing.
> >>
> >> -Grant
> >>
> >>
> >> --------------------------
> >> Grant Ingersoll
> >> http://lucene.grantingersoll.com
> >>
> >> Lucene Boot Camp Training:
> >> ApacheCon Atlanta, Nov. 12, 2007.  Sign up now!
> http://www.apachecon.com
> >>
> >> Lucene Helpful Hints:
> >> http://wiki.apache.org/lucene-java/BasicsOfPerformance
> >> http://wiki.apache.org/lucene-java/LuceneFAQ
> >>
> >>
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> >> For additional commands, e-mail: java-user-help@lucene.apache.org
> >>
> >>
> >
> >
> > --
> > Marcus Herou Solution Architect & Core Java developer Tailsweep AB
> > +46702561312
> > marcus.herou@tailsweep.com
> > http://www.tailsweep.com
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Group-by-in-Lucene---tf4749806.html#a14170395
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
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>
>


-- 
Marcus Herou CTO and co-founder Tailsweep AB
+46702561312
marcus.herou@tailsweep.com
http://www.tailsweep.com/
http://blogg.tailsweep.com/

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