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From Ravi Solr <ravis...@gmail.com>
Subject Re: Query ReRanking question
Date Sat, 06 Sep 2014 18:33:52 GMT
Erick,
        Your idea about reversing Joel's suggestion seems to give the best
results of all the options I tried...but I cant seem to understand why. I
thought the query shown below should give irrelevant results as sorting by
date would throw relevancy off...but somehow its getting relevant results
with fair enough reverse chronology. It is as if the sort is applied after
the docs are collected and reranked (which is what I wanted). One more
thing that baffled me was, if I change reRankDocs from 1000 to100 the
results become irrelevant, which doesnt make sense.

So can you kindly explain whats going on in the following query.

http://localhost:8080/solr/select?q=malaysian airline crash&rq={!rerank
reRankQuery=$rqq reRankDocs=1000}&rqq=*:*&sort=publish_date
desc&fl=headline,publish_date,score

I love the solr community, so much to learn from so many knowledgeable
people.

Thanks

Ravi Kiran Bhaskar



On Fri, Sep 5, 2014 at 1:23 PM, Erick Erickson <erickerickson@gmail.com>
wrote:

> OK, why can't you switch the clauses from Joel's suggestion?
>
> Something like:
> q=Malaysia plane crash&rq={!rerank reRankDocs=1000
> reRankQuery=$myquery}&myquery=*:*&sort=date+desc
>
> (haven't tried this yet, but you get the idea....).
>
> Best,
> Erick
>
> On Fri, Sep 5, 2014 at 9:33 AM, Markus Jelsma
> <markus.jelsma@openindex.io> wrote:
> > Hi - You can already achieve this by boosting on the document's recency.
> The result set won't be exactly ordered by date but you will get the most
> relevant and recent documents on top.
> >
> > Markus
> >
> > -----Original message-----
> >> From:Ravi Solr <ravisolr@gmail.com <mailto:ravisolr@gmail.com> >
> >> Sent: Friday 5th September 2014 18:06
> >> To: solr-user@lucene.apache.org <mailto:solr-user@lucene.apache.org>
> >> Subject: Re: Query ReRanking question
> >>
> >> Thank you very much for responding. I want to do exactly the opposite of
> >> what you said. I want to sort the relevant docs in reverse chronology.
> If
> >> you sort by date before hand then the relevancy is lost. So I want to
> get
> >> Top N relevant results and then rerank those Top N to achieve relevant
> >> reverse chronological results.
> >>
> >> If you ask Why would I want to do that ??
> >>
> >> Lets take a example about Malaysian airline crash. several articles
> might
> >> have been published over a period of time. When I search for - malaysia
> >> airline crash blackbox - I would want to see "relevant" results but
> would
> >> also like to see the the recent developments on the top i.e.
> effectively a
> >> reverse chronological order within the relevant results, like telling a
> >> story over a period of time
> >>
> >> Hope i am clear. Thanks for your help.
> >>
> >> Thanks
> >>
> >> Ravi Kiran Bhaskar
> >>
> >>
> >> On Thu, Sep 4, 2014 at 5:08 PM, Joel Bernstein <joelsolr@gmail.com
> <mailto:joelsolr@gmail.com> > wrote:
> >>
> >> > If you want the main query to be sorted by date then the top N docs
> >> > reranked by a query, that should work. Try something like this:
> >> >
> >> > q=foo&sort=date+desc&rq={!rerank reRandDocs=1000
> >> > reRankQuery=$myquery}&myquery=blah
> >> >
> >> >
> >> > Joel Bernstein
> >> > Search Engineer at Heliosearch
> >> >
> >> >
> >> > On Thu, Sep 4, 2014 at 4:25 PM, Ravi Solr <ravisolr@gmail.com
> <mailto:ravisolr@gmail.com> > wrote:
> >> >
> >> > > Can the ReRanking API be used to sort within docs retrieved by a
> date
> >> > field
> >> > > ? Can somebody help me understand how to write such a query ?
> >> > >
> >> > > Thanks
> >> > >
> >> > > Ravi Kiran Bhaskar
> >> > >
> >> >
> >>
> >
>

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