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https://issues.apache.org/jira/browse/LUCENE-3019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191194#comment-13191194
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Igor Motov commented on LUCENE-3019:
------------------------------------

The change from HashSet to ArrayList for flatQueries 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.
                
> FVH: uncontrollable color tags
> ------------------------------
>
>                 Key: LUCENE-3019
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3019
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/highlighter
>    Affects Versions: 2.9.4, 3.0.3, 3.1, 4.0
>            Reporter: Koji Sekiguchi
>            Assignee: Koji Sekiguchi
>            Priority: Trivial
>             Fix For: 3.5, 4.0
>
>         Attachments: LUCENE-3019.patch
>
>
> The multi-colored tags is a feature of FVH. But it is uncontrollable (or more 
> precisely, unexpected by users) that which color is used for each terms.

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