Haoyu Zhai created LUCENE-10122:
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Summary: Explore using BinaryDocValue 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
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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