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https://issues.apache.org/jira/browse/LUCENE-4764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576664#comment-13576664
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Shai Erera commented on LUCENE-4764:
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I see, thanks for the clarification. So basically, if I'm happy w/
Lucene42Codec, but just was to override a per-field setting (DV or posting),
it's simpler that I extend it. Would I also be able to extend FilterCodec, and
delegate to Lucene42 the fields that are of not interest to me? Would it still
use the PerField thingy for my fields too? Or in that case I'd need to use
PerField myself?
> 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, LUCENE-4764.patch, 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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