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https://issues.apache.org/jira/browse/LUCENE-9450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17384730#comment-17384730
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Adrien Grand commented on LUCENE-9450:
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Thinking a bit more about this, the approach of looking at the index created
version means users won't benefit from this change on their existing indices
and requires a bit more work in the short term, but it's also a bit cleaner and
will help us get done with this change earlier?
Scenario 1: use a different field name for binary doc values
- Lucene 9: writes binary doc values under field name $full_path_binary$,
reads either stored fields for $full_path$ (Lucene 8 compatibility) or binary
doc values for $full_path_binary$ (Lucene 9 compatibility).
- Lucene 10: writes binary doc values under field name $full_path$, reads
either binary doc values for $full_path_binary$ (Lucene 9 compatibility) or
binary doc values for $full_path$ (Lucene 10 compatibility).
- Lucene 11: migration is complete, Lucene always use binary doc values with
field name $full_path$.
Scenario 2: use index created version
- Lucene 9: reads/writes binary doc values or stored fields depending on the
index created version.
- Lucene 10: migration is complete, Lucene always use binary doc values with
field name $full_path$.
> Taxonomy index should use DocValues not StoredFields
> ----------------------------------------------------
>
> Key: LUCENE-9450
> URL: https://issues.apache.org/jira/browse/LUCENE-9450
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Affects Versions: 8.5.2
> Reporter: Gautam Worah
> Priority: Minor
> Labels: performance
> Fix For: main (9.0)
>
> Attachments: LUCENE-9450-localrun.py-v1, wip_taxonomy_patch
>
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> The taxonomy index that maps binning labels to ordinals was created before
> Lucene added BinaryDocValues.
> I've attached a WIP patch (does not pass tests currently)
> Issue suggested by [~mikemccand]
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