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Date: Wed, 16 Sep 2009 12:33:58 -0700 (PDT)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-1911) When using QueryWrapperFilter with
 CachingWrapperFilter, QueryWrapperFilter returns a DocIdSet that creates a
 Scorer, which gets cached rather than a bit set
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    [ https://issues.apache.org/jira/browse/LUCENE-1911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756194#action_12756194 ] 

Michael McCandless commented on LUCENE-1911:
--------------------------------------------

bq. we could add a DocIdSet.isCacheable() method

+1 to this, and to keeping docIdSetToCache() for overriding.  This is much cleaner than trying to check for every known DocIdSet impl.

Thanks for fixing this Uwe!

> When using QueryWrapperFilter with CachingWrapperFilter, QueryWrapperFilter returns a DocIdSet that creates a Scorer, which gets cached rather than a bit set
> -------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1911
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1911
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Mark Miller
>            Assignee: Uwe Schindler
>             Fix For: 2.9
>
>         Attachments: LUCENE-1911.patch
>
>
> there is a large performance cost to this.
> The old impl for this type of thing, QueryFilter, recommends :
> @deprecated use a CachingWrapperFilter with QueryWrapperFilter
> The deprecated QueryFilter itself also suffers from the problem because its now implemented using a CachingWrapperFilter and QueryWrapperFilter.
> see http://search.lucidimagination.com/search/document/7f54715f14b8b7a/lucene_2_9_0rc4_slower_than_2_4_1

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