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From Wei Wang <welshw...@gmail.com>
Subject Re: Lucene filter questions
Date Tue, 26 Feb 2013 00:46:51 GMT
Thank you, Mike. I will try it out.

On Mon, Feb 25, 2013 at 4:01 PM, Michael McCandless
<lucene@mikemccandless.com> wrote:
> On Mon, Feb 25, 2013 at 2:19 PM, Wei Wang <welshwang@gmail.com> wrote:
>> Cool. Thanks, Ian.
>>
>> I will try FieldCacheTermsFilter.
>>
>> A related question. Occasionally, we would like only use filtering
>> conditions instead of ranking/scoring. Right now I use
>> MatchAllDocsQuery with TermsFilter. Based on the code of
>> MatchAllDocsQuery, it seems the class enumerates all doc IDs up to
>> maxDoc. If we are able to interpret bitmap of filters directly, it may
>> be more efficient.
>>
>> Can we use Filter to return list of docs or count of docs directly?
>
> Use ConstantScoreQuery: it turns a Filter into a Query, where every
> doc gets a score equal to the ConstantScoreQuery.setBoost (1.0 by
> default).
>
> Mike McCandless
>
> http://blog.mikemccandless.com
>
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