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https://issues.apache.org/jira/browse/LUCENE-5352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13835465#comment-13835465
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Robert Muir commented on LUCENE-5352:
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Well at the least I think the reader just does way more work than is necessary:
its calling readLong() each time even for a low BPV.
> PackedInts.fastestFormatAndBits returns slower format for Direct
> ----------------------------------------------------------------
>
> Key: LUCENE-5352
> URL: https://issues.apache.org/jira/browse/LUCENE-5352
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> from some simple testing, DirectPacked64SingleBlockReader seems slower than
> DirectPackedReader (at least in a few cases i tested, more testing needed,
> but look at the code).
> this is unintuitive, because by passing e.g. FASTER you are making it slower.
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