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https://issues.apache.org/jira/browse/SOLR-9519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15507109#comment-15507109
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Michael Sun commented on SOLR-9519:
-----------------------------------
Here is a new patch with fix and test.
> Check sub-facets of empty facet buckets for operations that may expand the
> domain (like filter exclusions)
> ----------------------------------------------------------------------------------------------------------
>
> Key: SOLR-9519
> URL: https://issues.apache.org/jira/browse/SOLR-9519
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module
> Reporter: Yonik Seeley
> Attachments: SOLR-9519.patch, SOLR-9519.patch
>
>
> http://markmail.org/message/bgplt2qdxc7gqga5
> {quote}
> Background: the JSON Facet API does not execute sub-facets for a facet
> bucket with a 0 count (and the root facet bucket is like any other
> facet bucket).
> This was to help prevent the combinatorial explosion of deeply nested
> sub-facets with useless information.
> This is obviously incorrect though, when a sub-facet does something
> that can expand the domain rather than just restrict it. Facet
> exclusions are one of these cases.
> For zero facet buckets, we should check if any sub-facets have these
> properties and then recurse if so.
> {quote}
> Aside: not processing empty sets also helped with issues like what junk
> values to fill in for statistics... min, max, average, std, etc. JSON
> doesn't even officially support NaN, so it's nice to be able to leave these
> junk values out in many circumstances.
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