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https://issues.apache.org/jira/browse/SOLR-15078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mayya Sharipova closed SOLR-15078.
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Closing after the 8.9.0 release
> ExpandComponent treats all docs with '0' in a numeric collapse field the same
> as if null
> ----------------------------------------------------------------------------------------
>
> Key: SOLR-15078
> URL: https://issues.apache.org/jira/browse/SOLR-15078
> Project: Solr
> Issue Type: Bug
> Reporter: Chris M. Hostetter
> Assignee: Chris M. Hostetter
> Priority: Major
> Fix For: main (9.0), 8.9
>
> Attachments: SOLR-15078.patch
>
>
> ExpandComponent has an equivalent to the collapse qparser bug tracked in
> SOLR-15047...
> {quote}...has some very, _very_, old code/semantics in it that date back to
> when the {{FieldCache}} was incapable of differentiating between a document
> that contained '0' in the field being un-inverted, and a document that didn't
> have any value in that field.
> This limitation does not exist in DocValues (nor has it existed for a long
> time) but as the DocValues API has evolved, and as the [...] code has been
> updated to take advantage of the newer APIs that make it obvious when a
> document has no value in a field, the [...] code still explicitly equates "0"
> in a numeric field with the "null group"
> {quote}
>
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