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https://issues.apache.org/jira/browse/LUCENE-10062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17409948#comment-17409948
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Greg Miller commented on LUCENE-10062:
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As a next step, I want to better understand when this change has a positive
impact and when it might not be so great. To do so, it would be good to add
more diverse faceting use-cases to the {{luceneutil}} benchmarks, so I've
opened [an issue|https://github.com/mikemccand/luceneutil/issues/137] to track
that. I'll shift my focus over there when I have some spare time and then
return to this.
> 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
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> 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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