[hibernate-dev] [HSEARCH] Geo queries in ElasticSearch

[Nicolas Helleringer]

Good point.

It might be worth a try =)

Niko

2013/7/3 Emmanuel Bernard <emmanuel at hibernate.org>:
> It seems to me that for each geo facet, you need to execute a query
> which is fast. So in my example, the query will be executed 4 times. One
> for the regular query and 3 times with different radius retrieving the
> count. In other words, you don't really need to compute the distance for
> each point.
>
> Wouldn't that work?
>
> Emmanuel
>
> On Wed 2013-07-03 14:21, Nicolas Helleringer wrote:
>> The difficulty in this is that unlike other facets counts those are to
>> be dynamically computed.
>>
>> The current facet systems (either native Lucene or Hibernate ones) are
>> using the Lucen Token reverse
>> indexes performance to compute the facets on queries results that can
>> be very large.
>>
>> This cannot be done here as the distance to the search center is dynamic.
>> If you have a query with 10k result and you display only the first ten
>> results as first page and to strengthen
>> the search you want geo facets then you have to compute distance on
>> all the 10k results to produce that.
>> On the performance PoV this will fail.
>>
>> Niko
>>
>>
>> 2013/7/3 Emmanuel Bernard <emmanuel at hibernate.org>:
>> > I'm more interested in something like
>> >
>> > Within 10 kms (23)
>> > Between 10 and 50 kms (45)
>> > Above 50 kms (75)
>> >
>> >
>> > On Wed 2013-07-03 11:24, Nicolas Helleringer wrote:
>> >> Was is demonstrated here has nothing of a facet : these are only aggregates.
>> >>
>> >> <quote>
>> >> GeoDistanceFacet results:
>> >> -------------------------------------------------------------
>> >> Distance from origin: 0.0
>> >> Distance to requested: 1000.0
>> >> Number of results: 29
>> >> Minimum distance: 0.0
>> >> Maximum distance: 899.5358131385483
>> >> Sum of distances: 17320.209230844222
>> >> Mean distance: 597.2485941670421
>> >> </quote>
>> >>
>> >> I see nothing we cannot do.
>> >>
>> >> Niko
>> >>
>> >> 2013/7/3 Emmanuel Bernard <emmanuel at hibernate.org>:
>> >> > This morning I was reading http://hashmade.fr/elastic-search-geo-distance-search-with-sorted-and-faceted-results-using-java-native-api/
>> >> > And the code https://github.com/jsebrien/elastic-search-tests
>> >> >
>> >> > I have to say that we compare quite well in number of lines of code and readability. Considering that ElasticSearch is considered the easy tool / API in the search space, I did not expect that.
>> >> >
>> >> > We could do better on the facet side, I particular to retrieve the facet data.
>> >> >
>> >> > By the way, they offer a way to facet by spatial distance, Hardy, Nicolas, how hard would it be to do the same?
>> >> >
>> >> > Emmanuel
>> >> > _______________________________________________
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>> >> > hibernate-dev at lists.jboss.org
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