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https://issues.apache.org/jira/browse/LUCENE-5683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14006173#comment-14006173
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Robert Muir commented on LUCENE-5683:
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Sorry, I definitely see it as an inefficiency. This is easy to fix. I'll take
the issue.
We shouldnt let segmentreader be slow. It was part of the design to not make
pulling a docvalues expensive, because otherwise it makes it too hard to use
(it is the same thing we fixed for reusing fields in indexwriter).
> Improve SegmentReader.getXXXDocValues
> -------------------------------------
>
> Key: LUCENE-5683
> URL: https://issues.apache.org/jira/browse/LUCENE-5683
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Shai Erera
> Assignee: Robert Muir
>
> Today we do two hash lookups, where in most cases a single one is enough.
> E.g. SR.getNumericDocValues initializes the FieldInfo (first lookup in
> FieldInfos), however if that field was already initialized, we can simply
> check dvFields.get(). This can be improved in all getXXXDocValues as well as
> getDocsWithField.
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