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https://issues.apache.org/jira/browse/LUCENE-9946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17339187#comment-17339187
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Greg Miller commented on LUCENE-9946:
-------------------------------------
Just as a small update on this, I've hit a little speed bump in my
implementation due to a bug in my approach I discovered when writing tests. The
logic for rolling up range counts (in {{LongRangeCounter}}) needs to be
revisited to support multi-value cases, which is a little non-trivial. A few
cases to think through:
# A multi-valued field contributes counts to multiple elementary intervals in
the segment tree that roll up to different ranges. Each range should get a
count of {{1}} from the doc. The doc should only contribute {{1}} to
{{FacetResult#value}}.
# A multi-valued field contributes counts to multiple elementary intervals in
the segment tree that roll up to some of the same ranges. Each range should
receive a count of {{1}} from the doc (need to ensure multiple elementary
ranges rolling up to the same range don't double-count). The doc should only
contribute {{1}} to {{FacetResult#value}}.
# A multi-valued field contributes counts to the same elementary interval in
the segment tree. The individual ranges that the elementary interval rolls up
into should all only receive a count of {{1}} from the doc (need to ensure the
elementary interval doesn't get double counted, contributing > {{1}} to the
ranges it rolls up to). The doc should only contribute {{1}} to
{{FacetResult#value}}.
I'll circle back to this in a few days as I have more time to work on it.
> Support multi-value fields in range facet counting
> --------------------------------------------------
>
> Key: LUCENE-9946
> URL: https://issues.apache.org/jira/browse/LUCENE-9946
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Affects Versions: main (9.0)
> Reporter: Greg Miller
> Priority: Minor
>
> The {{RangeFacetCounts}} implementations ({{LongRangeFacetCounts}} and
> {{DoubleRangeFacetCount}}) only work on single-valued fields today. In
> contrast, the more recently added {{LongValueFacetCounts}} implementation
> supports both single- and multi-valued fields (LUCENE-7927). I'd like to
> extend multi-value support to both of the {{LongRangeFacetCounts}}
> implementations as well.
> Looking through the implementations, I can't think of a good reason to _not_
> support this, but maybe I'm overlooking something?
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