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https://issues.apache.org/jira/browse/LUCENE-2829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977353#action_12977353
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Michael McCandless commented on LUCENE-2829:
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I think we should commit this, and if/when LUCENE-2694 and/or LUCENE-2831 are
committed to 3.x, we can revisit it.
> 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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