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https://issues.apache.org/jira/browse/SOLR-15048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17259052#comment-17259052
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ASF subversion and git services commented on SOLR-15048:
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Commit a48e937f599bc1487df3321c490589b0d8820616 in lucene-solr's branch
refs/heads/master from Chris M. Hostetter
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=a48e937 ]
SOLR-15048: Fixed collapse parser behavior when dealing with docs boosted by
QueryElevationComponent that are in the null group to treat them consistently
regardless of collapse field type or group head selector
> 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
> Priority: Major
> Attachments: SOLR-15048.patch, SOLR-15048.patch, SOLR-15048.patch,
> SOLR-15048.patch
>
>
> 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. (even for simple string field collapsing, independent of the bugs in
> numeric field collapsing).
>
> I have not dug into WTF is happening here, but I'll attach my WIP test
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