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From Jan Høydahl <jan....@cominvent.com>
Subject Re: Date Faceting on Solr 3.1
Date Tue, 06 Sep 2011 22:23:30 GMT
Hi,

Note that if you want more control over the buckets, you may use facet.query instead. Also,
under development is SOLR-2366 which will eventually give a more powerful gap specification
to range facets.

--
Jan Høydahl, search solution architect
Cominvent AS - www.cominvent.com
Solr Training - www.solrtraining.com

On 6. sep. 2011, at 22:44, karthik wrote:

> Thanks Hoss.
> 
> Whatever you described does make sense, however we are migrating over from
> FAST and the date range buckets work differently there. The expectations of
> the business users are based on the existing system.
> 
> I need to reset their expectations ;-) ...
> 
> Thanks for the very detailed explanation.
> 
> -- karthik
> 
> On Sun, Sep 4, 2011 at 7:54 PM, Chris Hostetter <hossman_lucene@fucit.org>wrote:
> 
>> 
>> : Can solr take the earliest date from the result set to be the value for
>> : "facet.date.start"? I dont want to have the value 1/1/1995 hardcoded in
>> my
>> : application since a new data feed that gets into my index could be older
>> : than 1995 and i might keep missing them from the facet.
>> 
>> no, you have to pick a start and end date.
>> 
>> In most use cases, people pick a start date and gap size that is some
>> convinient order of magnitutde relative the time ranges they wnat to deal
>> in. ie: "I want to let people facet by year for the past 10 years" that
>> woud result in...
>> 
>>       facet.date.start=NOW/YEAR-1YEAR
>>       facet.date.gap=+1YEAR
>>       facet.date.end=NOW/YEAR+1YEAR
>> 
>> ...likewise you could said "I want to let people facet by month for the
>> past year" etc...
>> 
>> where facet.date.other and before/after come in handy is to people able to
>> tell your users "here are hte facet counts for each year of hte past 10
>> years, and there are X documents odler then that"  If people want to see
>> older documents, then you can refine your start/end (and maybe even gap)
>> to show them facets for those older years (maybe you keep a gap of 1YEAR
>> and just shift the start, maybe you switch to a gap of 10YEARS and use a
>> start that's 100 years ago?)
>> 
>> Solr Faceting doesn't offer a means to pick the "lowest" value in the
>> index, because it's usually either:
>> 
>> 1) something useful, but you already know that and know what it is and can
>> easily configure it manually (ie: 1995 for you)
>> 
>> 2) something so useless it would provide a terrible usecase if it was used
>> by default so you really have to configure it manually (ie: if your docs
>> span hundrads of years and you want to show counts per month it would be
>> painful to show every month for the past 500 years by default)
>> 
>> 3) something that fluctuates as the index changes and would result in an
>> inconsistent user experience so it would be undesirable (ie: one day
>> you're offering to facet per year for hte past 10 years, the next day
>> you're offering to facet per year for the past 47 years)
>> 
>> 
>> Note: if you take advatnage of the "key" localparam, you can facet on the
>> same field with multiple date ranges (ie: facet per year for the last 10
>> years, and facet per decade for the past 100 years) in a single request --
>> so that might come in handy for you...
>> 
>> 
>> https://wiki.apache.org/solr/SimpleFacetParameters#key_:_Changing_the_output_key
>> 
>> 
>> -Hoss
>> 


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