Re: Dynamically calculated range facet

[Rohit Gandhe <ro...@gmail.com>]

I know this is an old thread, but I am not sure if this thread concluded with
any concrete result. 

Martin,
I see you started some changes to Solr Code in "RangeRequestHandler". Did
you ever release them as a patch? Has anybody been working on this issue. I
read through most of Hossman's posts and I understand the necessity to make
this feature as generic as possible, but for now I am only interested in
using it for simple things like prices and percent discount etc.

I just want to know if anybody has 
1) released any code as patch which touches this issue
2) created a Jira issue which I can read and contribute to
3) added something to wiki

Otherwise, I would be happy to start this on jira with links to all the
posts I have found on this issue.
Thanks


Martin Grotzke wrote:
> 
> On Tue, 2007-06-26 at 23:22 -0700, Chris Hostetter wrote:
>> : So if it would be possible to go over each item in the search result
>> : I could check the price field and define my ranges for the specific
>> : query on solr side and return the price ranges as a facet.
>> 
>> : Otherwise, what would be a good starting point to plug in such
>> : functionality into solr?
>> 
>> if you relaly want to do statistical distributions, one way to avoid
>> doing
>> all of this work on the client side (and needing to pull back all of hte
>> prices from all of hte matches) would be to write a custom request
>> handler
>> that subclasses whichever on you currently use and does this computation
>> on the server side -- where it has lower level access to the data and
>> doesn't need to stream it over the wire.  FieldCache in particular would
>> come in handy.
> Now we want to have fun with statistics and calculation, and I just set
> up a new project with a dependency on apache-solr-1.2.0. I started a
> RangeRequestHandler extending StandardRequestHandler, but I don't really
> see where to plug in. Most probably it's the handleRequestBody, but
> there's a lot of stuff in StandardRequestHandler.handleRequestBody that
> I do not want to repeat...
> 
> To ask a question: how could I get each document of the result to
> check the price and do some calculation at the end?
> Logging that to stdout would be fine at first, afterwards I would
> like to add a new facet to the result with some info.
> 
> Thanx in advance,
> cheers,
> Martin
> 
> 
>> 
>> it occurs to me that even though there may not be a way to dynamicly
>> create facet ranges that can apply usefully on any numeric field, we
>> could
>> add generic support to the request handlers for optionally fetching some
>> basic statistics about a DocSet for clients that want them (either for
>> building ranges, or for any other purpose)
>> 
>> min, max, mean, median, mode, midrange ... those should all be easy to
>> compute using the ValueSource from the field type (it would be nice if
>> FieldType's had some way of indicating which DocValues function can best
>> manage the field type, but we can always assume float or have an option
>> for dictating it ... people might want a float mean for an int field
>> anyway)
>> 
>> i suppose even stddev could be computed fairly easily ... there's a
>> formula for that that works well in a single pass over a bunch of values
>> right?
>> 
>> 
>> 
>> 
>> -Hoss
>> 
> -- 
> Martin Grotzke
> http://www.javakaffee.de/blog/
> 
>  
> 

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