Jason Gerlowski created SOLR-15049:
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Summary: Optimize TopLevelJoinQuery "self joins"
Key: SOLR-15049
URL: https://issues.apache.org/jira/browse/SOLR-15049
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: query parsers
Affects Versions: master (9.0)
Reporter: Jason Gerlowski
Assignee: Jason Gerlowski
The "TopLevelJoinQuery" join implementation added recently performs well in a
variety of circumstances. However we can improve the performance further by
adding logic to handle the special case where fields being joined are the same
(e.g. {{fromIndex}} is null and {{fromField}} == {{toField}}).
Currently this self-join usecase still does a lot of work to convert "from"
ordinals into "to" ordinals. If we make the query (or QParserPlugin?) smart
enough to recognize this special case we can skip this step and improve
performance greatly in this case.
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