Kevin Risden created SOLR-17131:
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Summary: Optimize rows=0 queries since score/sort isn't necessary
Key: SOLR-17131
URL: https://issues.apache.org/jira/browse/SOLR-17131
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Kevin Risden
Assignee: Kevin Risden
If a query has rows=0 Solr does not need to sort the results or even compute
the score. This means the filterCache can be more efficient to compute the
result and Solr doesn't spend time on unnecessarily sorting and scoring large
result sets for it to be thrown away.
This was found while looking at
https://issues.apache.org/jira/browse/SOLR-14765 and trying to reason through
the case of rows=0 that are sometimes used to just determine count of matching
results. This change adds the check for rows=0 before other checks to ensure
that we can short circuit scoring even if there is a scoring query. We also
don't add the query to the filter cache since that could result in filter cache
thrashing.
In some tests, we found that queries with rows=0 p99 improved by 50% and CPU
dropped by 5%.
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