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https://issues.apache.org/jira/browse/LUCENE-9950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17357589#comment-17357589
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Julie Tibshirani commented on LUCENE-9950:
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I've noticed a few failures in the new {{TestStringValueFacetCounts}} class. I
didn't have the chance to dig into them. This line reproduces reliably on
{{main}}:
{code}
./gradlew test --tests TestStringValueFacetCounts.testRandom
-Dtests.seed=B6D7A1E1813518E3 -Dtests.slow=true -Dtests.badapples=true
-Dtests.locale=nus-SS -Dtests.timezone=Asia/Pyongyang -Dtests.asserts=true
-Dtests.file.encoding=UTF-8
{code}
> Support both single- and multi-value string fields in facet counting
> (non-taxonomy based approaches)
> ----------------------------------------------------------------------------------------------------
>
> Key: LUCENE-9950
> URL: https://issues.apache.org/jira/browse/LUCENE-9950
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Affects Versions: main (9.0)
> Reporter: Greg Miller
> Priority: Minor
> Fix For: main (9.0), 8.9
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> Users wanting to facet count string-based fields using a non-taxonomy-based
> approach can use {{SortedSetDocValueFacetCounts}}, which accumulates facet
> counts based on a {{SortedSetDocValues}} field. This requires the stored doc
> values to be multi-valued (i.e., {{SORTED_SET}}), and doesn't work on
> single-valued fields (i.e., SORTED). In contrast, if a user wants to facet
> count on a stored numeric field, they can use {{LongValueFacetCounts}}, which
> supports both single- and multi-valued fields (and in LUCENE-9948, we now
> auto-detect instead of asking the user to specify).
> Let's update {{SortedSetDocValueFacetCounts}} to also support, and
> automatically detect single- and multi-value fields. Note that this is a
> spin-off issue from LUCENE-9946, where [~rcmuir] points out that this can
> essentially be a one-line change, but we may want to do some class renaming
> at the same time. Also note that we should do this in
> {{ConcurrentSortedSetDocValuesFacetCounts}} while we're at it.
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