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From "Jason Rutherglen" <jason.rutherg...@gmail.com>
Subject Re: Sorting posting lists before intersection
Date Wed, 17 Sep 2008 17:59:47 GMT
It would be a good feature in Lucene to be able to sort, or perhaps
store the postings in term frequency sorted order.  Thoughts?

On Wed, Sep 17, 2008 at 9:33 AM, Andrzej Bialecki <ab@getopt.org> wrote:
> Renaud Delbru wrote:
>>
>> Hi all,
>>
>> I am wondering if Lucene implements the query optimisation that consists
>> of ordering the posting lists based on the term frequency before
>> intersection ?
>> If yes, could somebody point me to the java class / method that implements
>> such strategy ?
>
> Lucene trunk: ConjunctionScorer, lines 85-103 - pay attention to the
> comments there, it's not strictly a sort by frequency, rather by the sampled
> "sparseness".
>
> --
> Best regards,
> Andrzej Bialecki     <><
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>
>
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