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From Rene Hackl-Sommer <rene.a.ha...@gmx.de>
Subject Re: Increase number of available positions?
Date Tue, 16 Mar 2010 08:35:19 GMT
Hi Guys,

Thanks for the input! I am now going to put in some work to see how 
things fare.

Should I post the question about substituting int with long on 
lucene-dev again, if need arises?

Thanks again,
Rene



Am 15.03.2010 23:04, schrieb Steven A Rowe:
> Hi Rene,
>
> Have you seen SpanNotQuery?:
>
> <http://lucene.apache.org/java/3_0_1/api/core/org/apache/lucene/search/spans/SpanNotQuery.html>
>
> For a document that looks like:
>
> <Level_1 id="1">
>    <Level_2 id="1">
>      <Level_3 id="1">T1 T2 T3</Level_3>
>      <Level_3 id="2">T4 T5 T6</Level_3>
>      <Level_3 id="3">T7 T8 T9</Level_3>
>    </Level_2>
>    <Level_2 id="2">
>      <Level_3 id="1">T10 T11 T12</Level_3>
>      <Level_3 id="2">T13 T14 T15</Level_3>
>      <Level_3 id="3">T16 T17 T18</Level_3>
>    </Level_2>
>    ...
> </Level1>
> ...
>
> You could generate the following token stream (L_X being a concrete level boundary token):
>
> L_1 L_2 L_3 T1  T2  T3  L_3 T4  T5  T6  L_3 T7  T8  T9
>      L_2 L_3 T10 T11 T12 L_3 T13 T14 T15 L_3 T16 T17 T18
>      L_2 ...
> ...
>
> A query to find T2 and T8 on the same Level_2 would require you to find a span containing
T2 and T8, but not containing L_2.
>
> This scheme will generalize to as many levels as you need, and you can use nested span
queries to simultaneously provide constraints at multiple levels.  No position increment gap
required.
>
> Caveat: this scheme is not tested - I could be way off base :).
>
> Steve
>
>
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