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https://issues.apache.org/jira/browse/LUCENE-6379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14389019#comment-14389019
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ASF subversion and git services commented on LUCENE-6379:
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Commit 1670412 from [~mikemccand] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1670412 ]
LUCENE-6379: short circuit IndexWriter.deleteDocuments(MatchAllDocsQuery) to
the much faster and schema-cleansing .deleteAll
> 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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