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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-5798) minor optimizations to MultiDocs(AndPositions)Enum.reset()
Date Tue, 01 Jul 2014 11:53:26 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-5798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir resolved LUCENE-5798.
---------------------------------

       Resolution: Fixed
    Fix Version/s: 4.10
                   5.0

> minor optimizations to MultiDocs(AndPositions)Enum.reset()
> ----------------------------------------------------------
>
>                 Key: LUCENE-5798
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5798
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Robert Muir
>             Fix For: 5.0, 4.10
>
>         Attachments: LUCENE-5798.patch
>
>
> This method is called by merging for each term, potentially many times, but only returning
a few docs for each invocation (e.g. imagine high cardinality fields, unique id fields, normal
zipf distribution on full text).
> Today we create a new EnumWithSlice[] array and new EnumWithSlice entry for each term,
but this creates a fair amount of unnecessary garbage: instead we can just make this array
up-front as size subReaderCount and reuse it.



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