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https://issues.apache.org/jira/browse/LUCENE-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575379#comment-13575379
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Shai Erera commented on LUCENE-4765:
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I briefly looked at the patch, looks good. Perhaps instead of returning an
iterator, we should return an IntsRef? While optimizing facets code, Mike and I
observed the "iterator-based API" is not so good for "hot code", and e.g. if
we'll want to use this for faceting, a bulk-API would be better I think.
Same question for indexing -- in facets, we get all the ordinals at once, so is
it possible to have a field which takes a list of ordinals instead of adding
many instances of SortedSetDVField?
> Multi-valued docvalues field
> ----------------------------
>
> Key: LUCENE-4765
> URL: https://issues.apache.org/jira/browse/LUCENE-4765
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Robert Muir
> Attachments: LUCENE-4765.patch
>
>
> The general idea is basically the docvalues parallel to
> FieldCache.getDocTermOrds/UninvertedField
> Currently this stuff is used in e.g. grouping and join for multivalued
> fields, and in solr for faceting.
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