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https://issues.apache.org/jira/browse/LUCENE-10062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17403906#comment-17403906
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Michael McCandless commented on LUCENE-10062:
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+1, this is a great idea!
> Explore using SORTED_NUMERIC doc values to encode taxonomy ordinals for
> faceting
> --------------------------------------------------------------------------------
>
> Key: LUCENE-10062
> URL: https://issues.apache.org/jira/browse/LUCENE-10062
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Greg Miller
> Assignee: Greg Miller
> Priority: Minor
>
> We currently encode taxonomy ordinals using varint style packing in a binary
> doc values field. I suspect there have been a number of improvements to
> SortedNumericDocValues since taxonomy faceting was first introduced, and I
> plan to explore replacing the custom binary format we have today with a
> SORTED_NUMERIC type dv field instead.
> I'll report benchmark results and index size impact here.
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