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https://issues.apache.org/jira/browse/LUCENE-10122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17446058#comment-17446058
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Haoyu Zhai commented on LUCENE-10122:
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Ah Thanks [~jpountz] for reminding, I forgot that, here we go:
https://github.com/apache/lucene/pull/454
> 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: 9.0
> Reporter: Haoyu Zhai
> Priority: Minor
> Time Spent: 5.5h
> Remaining Estimate: 0h
>
> 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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