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From Shawn Heisey <s...@elyograg.org>
Subject Re: range types in SOLR
Date Sat, 01 Mar 2014 19:54:09 GMT
On 3/1/2014 11:41 AM, Thomas Scheffler wrote:
> Am 01.03.14 18:24, schrieb Erick Erickson:
>> I'm not clear what you're really after here.
>>
>> Solr certainly supports ranges, things like time:[* TO date_spec] or
>> date_field:[date_spec TO date_spec] etc.
>>
>>
>> There's also a really creative use of spatial (of all things) to, say
>> answer questions involving multiple dates per record. Imagine, for
>> instance, employees with different hours on different days. You can
>> use spatial to answer questions like "which employees are available
>> on Wednesday between 4PM and 8PM".
>>
>> And if none of this is relevant, how about you give us some
>> use-cases? This could well be an XY problem.
> 
> Hi,
> 
> lets try this example to show the problem. You have some old text that
> was written in two periods of time:
> 
> 1.) 2nd half of 13th century: -> 1250-1299
> 2.) Beginning of 18th century: -> 1700-1715
> 
> You are searching for text that were written between 1300-1699, than
> this document described above should not be hit.
> 
> If you make start date and end date multiple this results in:
> 
> start: [1250, 1700]
> end: [1299, 1715]
> 
> A search for documents written between 1300-1699 would be:
> 
> (+start:[1300 TO 1699] +end:[1300-1699]) (+start:[* TO 1300] +end:[1300
> TO *]) (+start:[*-1699] +end:[1700 TO *])
> 
> You see that the document above would obviously hit by "(+start:[* TO
> 1300] +end:[1300 TO *])"

This sounds exactly like the spatial use case that Erick just described.

http://wiki.apache.org/solr/SpatialForTimeDurations
https://people.apache.org/~hossman/spatial-for-non-spatial-meetup-20130117/

I am not sure whether the following presentation covers time series with
spatial, but it does say deep dive.  It's over an hour long, and done by
David Smiley, who wrote most of the Spatial code in Solr:

http://www.lucenerevolution.org/2013/Lucene-Solr4-Spatial-Deep-Dive

Hopefully someone who has actually used this can hop in and give you
some additional pointers.

Thanks,
Shawn


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