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https://issues.apache.org/jira/browse/SOLR-15049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253528#comment-17253528
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ASF subversion and git services commented on SOLR-15049:
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Commit 7f8e260c124e94ddd5033ee30249cf56f813729e in lucene-solr's branch
refs/heads/branch_8x from Jason Gerlowski
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=7f8e260 ]
SOLR-15049: Add TopLevelJoinQuery optimization for 'self-joins'
> 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
> 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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