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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:
--------------------------------------------

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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