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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