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From Preetham Kajekar <preet...@cisco.com>
Subject Re: Query rewriting/optimization
Date Thu, 21 May 2009 23:32:26 GMT
Thanks for the response ! Will post my findings.

Thx,
 ~preetham

Michael McCandless wrote:
> Alas, Lucene in general does not do such structural optimization (and
> I agree, we should).  EG we could do it during Query.rewrite().
>
> There are certain corner cases that are handled, eg a BooleanQuery
> with a single BooleanClause, or BooleanQuery where
> minimumNumberShouldMatch exceeds the number of SHOULD clauses
> immediately returns no matches, etc.
>
> So in general if there are "interesting" functional equivalents of
> your query, you should try them out.  Eg if you use filtering, you
> should test adding it as a clause on BooleanQuery instead of passing
> in the"Filter" arge to search (we are considering doing that
> internally).
>
> If you do some testing and learn anything interesting, please post
> back!
>
> Mike
>
> On Thu, May 21, 2009 at 1:06 PM, Preetham Kajekar <preetham@cisco.com> wrote:
>   
>> Hi,
>> I am wondering if Lucene internally rewrites/optimizes Query. I am
>> programatically generating Query based on various user options, and quite
>> often I have BooleanQueri'es wrapped inside BooleanQueries etc.
>> Like,
>> ((Src:Testing Dst:Test) (Src:Test2 Port:http)).
>> In this case, would Lucene optimize to remove the unwanted BooleanQueries ?
>> Or more importantly, would these extra BooleanQueries cause any performance
>> problems and should I fix my code to have a better Query ?
>>
>> Thanks,
>> ~preetham
>>
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>>     
>
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