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https://issues.apache.org/jira/browse/LUCENE-10122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17420016#comment-17420016
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Haoyu Zhai commented on LUCENE-10122:
-------------------------------------

Oh my bad, I wanted to say NumericDocValues but typed BinaryDocValues in title, 
just changed.

> Explore using NumericDocValue to store taxonomy parent array
> ------------------------------------------------------------
>
>                 Key: LUCENE-10122
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10122
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>    Affects Versions: main (9.0)
>            Reporter: Haoyu Zhai
>            Priority: Minor
>
> We currently use term position of a hardcoded term in a hardcoded field to 
> represent the parent ordinal of each taxonomy label. That is an old way and 
> perhaps could be dated back to the time where doc values didn't exist.
> We probably would want to use NumericDocValues instead given we have spent 
> quite a lot of effort optimizing them.



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