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https://issues.apache.org/jira/browse/SOLR-15047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17249444#comment-17249444
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Chris M. Hostetter commented on SOLR-15047:
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i started working on this, but am currently blocked trying to make sense of
SOLR-15048
> 'collapse' on numeric field treats all docs with '0' in collapse field as
> part of the null group
> ------------------------------------------------------------------------------------------------
>
> Key: SOLR-15047
> URL: https://issues.apache.org/jira/browse/SOLR-15047
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Chris M. Hostetter
> Assignee: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-15047.patch
>
>
> The CollapseQParser 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 collapse 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 collapse code still explicitly equates
> "0" in a numeric field with the "null group"
> We can/should fix this bug so that the behavior is sane.
> ----
> Known workaround for this problem: (redundantly) index a "string" version of
> the field being collapsed on - but this is a poor substitute fro being able
> to efficiently collapse on numeric fields (which take up less space on disk
> and in the collapse data structures)
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