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https://issues.apache.org/jira/browse/LUCENE-4764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576541#comment-13576541
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Michael McCandless commented on LUCENE-4764:
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bq. However, I realized later that this is not doable, since Codecs must have a
default constructor, and b/c of how they are initialized, they cannot rely on
stuff passed to them in the ctor (e.g. when they are initialized by a reader?).
Actually this is a non-issue: the PerFieldDVFormat writes which format was used
for which field, and uses that at read-time. The index is "self-contained" and
you don't need any special logic at read-time ...
> Faster but more RAM/Disk consuming DocValuesFormat for facets
> -------------------------------------------------------------
>
> Key: LUCENE-4764
> URL: https://issues.apache.org/jira/browse/LUCENE-4764
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.2, 5.0
>
> Attachments: LUCENE-4764.patch
>
>
> The new default DV format for binary fields has much more
> RAM-efficient encoding of the address for each document ... but it's
> also a bit slower at decode time, which affects facets because we
> decode for every collected docID.
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