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https://issues.apache.org/jira/browse/SOLR-16217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17573015#comment-17573015
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ASF subversion and git services commented on SOLR-16217:
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Commit 1d9abb1aea11fe25667550df7d9ae687ae0c540f in solr's branch
refs/heads/branch_9x from Christine Poerschke
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=1d9abb1aea1 ]
SOLR-16217: SortingMergePolicy: test coverage for dual-field sort (#883)
(cherry picked from commit 56a4f6a288f47a62278da9e727265659efefdce8)
> SortingMergePolicy: test coverage for dual-field sort
> -----------------------------------------------------
>
> Key: SOLR-16217
> URL: https://issues.apache.org/jira/browse/SOLR-16217
> Project: Solr
> Issue Type: Test
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> SOLR-5730 previously made Lucene's {{SortingMergePolicy}} configurable in
> Solr.
> The sort criteria could be (say) {{timestamp_i_dvo desc}} or (say)
> {{timestamp_i_dvo desc, id desc}} with the latter using the unique document
> key to ensure deterministic sorting.
> See e.g.
> [https://github.com/apache/solr/blob/releases/solr/9.0.0/solr/core/src/java/org/apache/solr/search/SolrIndexSearcher.java#L193]
> and
> [https://github.com/apache/solr/blob/releases/solr/9.0.0/solr/core/src/java/org/apache/solr/search/EarlyTerminatingSortingCollector.java#L55-L67]
> w.r.t. {{segmentTerminateEarly}} logic detail i.e. single-field
> {{sort=timestamp_i_dvo desc}} could be used if the merge policy has
> dual-field {{timestamp_i_dvo desc, id desc}} but dual-field sort requires
> dual-field merge policy.
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