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https://issues.apache.org/jira/browse/SOLR-15049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gerlowski resolved SOLR-15049.
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Fix Version/s: master (9.0)
8.8
Resolution: Fixed
> 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
> Priority: Minor
> Fix For: 8.8, master (9.0)
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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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