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From rama44ster <>
Subject Re: A question on implementing new operators
Date Wed, 03 Dec 2014 05:42:44 GMT
Hi David,
Many thanks for the pointers and sharing the slides. I will take a look in
that direction.


On Tue, Dec 2, 2014 at 8:38 PM, <> wrote:

> Hi Prasad,
> Firstly, the Lucene ‘general’ list is not the appropriate list; it’s the
> java-user lucene list so I’m replying there instead.
> This is mostly about query parsing.  If you look at Lucene’s modules,
> you’ll see a “queryparser” module.  In there, there’s a “flexible” package
> which is named as-such because it’s a flexible query parsing framework.  It
> comes with a pre-built instantiation that emulates Lucene’s
> standard/classic query parser syntax.  You’ll need to modify the javacc
> syntax definition a ‘.jj’ file and plug in a variety of pieces into the
> framework.  Ultimately, when you get to the ‘builder’ part, you'll create a
> suitable Lucene Query by calling spatialStrategy.makeQuery(…).
> I can’t offer much more help on this so I hope this is enough to get you
> going.
> ~ David Smiley
> Freelance Apache Lucene/Solr Search Consultant/Developer
> On Tue, Dec 2, 2014 at 4:53 PM, rama44ster <> wrote:
>> Hi all,
>> I have started trying out lucene for one of my projects and I have a table
>> where the document has a latitude, longitude associated with it. I would
>> like to retrieve only those documents whose latitude and longitude fall
>> inside a bounding box that has two co-ordinates, (x_1, y_1) and (x_2,
>> y_2).
>> Is there any way, I can implement this in lucene? Is it possible to extend
>> the parser to understand a new syntax where I can express this in the text
>> query and have the parser build a query that will contain all the logic
>> necessary to do this check. Something like IN_BOX(latitude, longitude,
>> 23.00, 26.00, 50.00, 60.00). Here latitude and longitude are two stored
>> fields and 23,26 and 50,60 are the two co-ordinates for bounding box.
>> I also checked the spatial package of lucene, but couldn’t find any
>> pointers.
>> Thanks,
>> Prasad.

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