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From Ian Lea <ian....@gmail.com>
Subject Re: SpanNearQuery and matching spans inside the first span
Date Thu, 08 Dec 2011 18:01:44 GMT
Have you read http://www.lucidimagination.com/blog/2009/07/18/the-spanquery/?
 Might help explain some of the behaviour you are seeing.


--
Ian.


On Tue, Dec 6, 2011 at 4:42 AM, Trejkaz <trejkaz@trypticon.org> wrote:
> Supposing I have a document with just "hi there" as the text.
>
> If I do a span query like this:
>
>    near(near(term('hi'), term('there'), slop=0, forwards),
> term('hi'), slop=1, any-direction)
>
> that returns no hits.  However, if I do a span query like this:
>
>    near(near(term('hi'), term('there'), slop=0, forwards),
> term('there'), slop=1, any-direction)
>
> that returns the document.
>
> It seems that the rule is that if the two spans *start* at the same
> position, then they are not considered "near" each other.  But from
> the POV of a user (and from this developer) this is lop-sided because
> in both situations, the second span was inside the first span.  It
> seems like they should either both be considered hits, or both be
> considered non-hits.
>
> I am wondering what others think about this and whether there is any
> way to manipulate/rewrite the query to get a more balanced-looking
> result.
>
> (I'm sure it gets particularly hairy, though, when your two spans
> overlap only partially... is that "near" or not?)
>
> TX
>
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