On Thu, Aug 27, 2009 at 6:30 AM, Grant Ingersoll<gsing...@apache.org> wrote:
>> I am wondering... are new SOLR filtering features faster than standard
>> Lucene queries like
>> {query} AND {filter}???
>
> The new filtering features in Solr are just doing what Lucene started doing
> in 2.4 and that is using skipping when possible. It used to be the case in
> both Lucene and Solr that the filter was only every applied after scoring
> but before insertion into the Priority Queue. That is now fixed.
I think performance of filtering can still be further improved, within
Lucene... it's still very much a work in progress.
EG if a filter is random access (eg RAM resident as a bit set), which
I think for Solr is frequently the case (?), it ought to be applied
just like we now apply deleted documents (LUCENE-1536 is opened for
this). This can result in sizable performance gains, especially for
more complex queries and no-so-dense filters.
Mike
