[SOLR-16217] SortingMergePolicy: test coverage for dual-field sort

• Type: Test
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 9.1, main (10.0)
• Assignee: Christine Poerschke
• Reporter: Christine Poerschke
• Created: 27/May/22 18:13
• Updated: 10/Jan/23 20:45
• Resolved: 29/Jul/22 14:49

Description

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.

Issue Links

• is related to: SOLR-13681 make Lucene's index sorting directly configurable in Solr
• is related to: SOLR-5730 make Lucene's SortingMergePolicy and EarlyTerminatingSortingCollector configurable in Solr
• links to: GitHub Pull Request #883