Chris M. Hostetter created SOLR-15048:
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             Summary: collapse + query elevation behaves inconsistenty w/ 'null 
group' docs depending on group head selector
                 Key: SOLR-15048
                 URL: https://issues.apache.org/jira/browse/SOLR-15048
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Chris M. Hostetter
            Assignee: Chris M. Hostetter


while working on SOLR-15047, I realized I wasn't really clear on what the 
_expected_ semantics of were suppose to be when "boosting"
 docs that had null values in the collapse field.

I expanded on my test from that jira, to demonstrate the logic i (thought) i 
understood from the Ord based collector - but then discovered that depending on 
the group head selector used (ie: OrdScoreCollector vs 
OrdFieldValueCollector+OrdIntStrategy vs 
OrdFieldValueCollector+OrdValueSourceStrategy , etc...) you get different 
behavior - not just in what group head is selected, but even when the behavior 
should be functionally equivilent, you can get different sets of groups.

 

I have not dug into WTF is happening here, but I'll attach my WIP test



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