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https://issues.apache.org/jira/browse/LUCENE-6379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14388838#comment-14388838
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Adrien Grand commented on LUCENE-6379:
--------------------------------------

+1!

> IndexWriter's delete-by-query should optimize/specialize MatchAllDocsQuery
> --------------------------------------------------------------------------
>
>                 Key: LUCENE-6379
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6379
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: Trunk, 5.1
>
>         Attachments: LUCENE-6379.patch, LUCENE-6379.patch
>
>
> We can short-circuit this to just IW.deleteAll (Solr already does so I 
> think).  This also has the nice side effect of clearing Lucene's low-schema 
> (FieldInfos).



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