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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2829) improve termquery "pk lookup" performance
Date Wed, 22 Dec 2010 14:59:04 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974229#action_12974229
] 

Robert Muir commented on LUCENE-2829:
-------------------------------------

On further thought Yonik, your idea is really completely unrelated.

We shouldn't be seeking to terms/relying upon the terms dictionary cache 
internally when we don't need to...

whether or not its populated with negative entries for the more general case is unrelated,
even if we go that route we shouldn't be lazy and rely upon that.


> improve termquery "pk lookup" performance
> -----------------------------------------
>
>                 Key: LUCENE-2829
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2829
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Robert Muir
>         Attachments: LUCENE-2829.patch
>
>
> For things that are like primary keys and don't exist in some segments (worst case is
primary/unique key that only exists in 1)
> we do wasted seeks.
> While LUCENE-2694 tries to solve some of this issue with TermState, I'm concerned we
could every backport that to 3.1 for example.
> This is a simpler solution here just to solve this one problem in termquery... we could
just revert it in trunk when we resolve LUCENE-2694,
> but I don't think we should leave things as they are in 3.x

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