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https://issues.apache.org/jira/browse/LUCENE-7463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15543594#comment-15543594
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Michael McCandless commented on LUCENE-7463:
--------------------------------------------
+1
> Create a Lucene70DocValuesFormat
> --------------------------------
>
> Key: LUCENE-7463
> URL: https://issues.apache.org/jira/browse/LUCENE-7463
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 7.0
>
> Attachments: LUCENE-7463.patch
>
>
> Even if it is not optimal, I think it would help to create a
> Lucene70DocValuesFormat now by copying the current Lucene54DocValuesFormat
> and including some minor changes like making the sparse case use a true
> iterator API as described in LUCENE-7457 (which should make it to
> Lucene54DocValuesFormat a well so that merging from an old codec would be
> efficient) as well as raising the threshold to enable sparse encoding and
> using nextSetBit operations when iterating bit sets, which cannot be done
> easily in Lucene54DocValuesFormat because we'd need to add a couple trailing
> bytes to make sure we can read a long at any valid index.
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