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https://issues.apache.org/jira/browse/LUCENE-3719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13195913#comment-13195913
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Koji Sekiguchi commented on LUCENE-3719:
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Thanks Igor for reporting the issue and providing the patch!
> FVH: slow performance on very large queries
> -------------------------------------------
>
> Key: LUCENE-3719
> URL: https://issues.apache.org/jira/browse/LUCENE-3719
> Project: Lucene - Java
> Issue Type: Bug
> Components: modules/highlighter
> Affects Versions: 3.5, 4.0
> Reporter: Igor Motov
> Assignee: Koji Sekiguchi
> Priority: Minor
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3719.patch
>
>
> The change from HashSet to ArrayList for flatQueries in LUCENE-3019 resulted
> in very significant slowdown in some of our e-discovery queries after upgrade
> from 3.4.0 to 3.5.0. Our queries sometime contain tens of thousands of terms.
> As a result, major portion of execution time for such queries is now spent in
> the flatQueries.contains( sourceQuery ) method calls.
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