Houston Putman created SOLR-17737:
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Summary: ReRankQuery does not respect original sorting on ties
Key: SOLR-17737
URL: https://issues.apache.org/jira/browse/SOLR-17737
Project: Solr
Issue Type: Improvement
Components: reranker
Reporter: Houston Putman
When using sorting on reranked queries, the original sort is ignored after
reranking (for non-distributed queries). This means that if the reranked score
has any ties, the original sort is not used as the tie-breaker. Instead
Lucene's {{QueryRescorer}} will use the Lucene docId as the tie-breaker, which
is pretty useless for Solr.
Hopefully this behavior will change after
[https://github.com/apache/lucene/issues/14455] is implemented, but for now,
and for the rest of 9.x, this will likely not be fixable without writing our
own {{{}QueryRescorer{}}}.
In general, this does cause reproducible failures in
{{TestReRankQParserPlugin.testMinExactCount:}}
{quote}{{./gradlew :solr:core:test --tests
"org.apache.solr.search.TestReRankQParserPlugin.testMinExactCount"
-Ptests.seed=EE770EAA60DF4F30}}
{quote}
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