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https://issues.apache.org/jira/browse/SOLR-17923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029688#comment-18029688
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ASF subversion and git services commented on SOLR-17923:
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Commit b844e4558dfbc4530656b062c9067a508d73bc2d in solr's branch
refs/heads/dependabot/gradle/apache-poi-5.4.1 from Andy Webb
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=b844e4558df ]
SOLR-17923: Add fullOuterJoin stream function (#3676)
> Add fullOuterJoin stream function
> ---------------------------------
>
> Key: SOLR-17923
> URL: https://issues.apache.org/jira/browse/SOLR-17923
> Project: Solr
> Issue Type: New Feature
> Components: streaming expressions
> Reporter: Andy Webb
> Priority: Major
> Labels: pull-request-available
> Fix For: 9.10
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> The existing {{join}} functions discard tuples from the Right stream that
> don't appear in the Left. Adding a {{fullOuterJoin}} function will enable the
> construction of e.g. Reciprocal Rank Fusion (RRF) stream expressions that
> require non-matching tuples from the Right stream to be included.
> I've created a {{fullOuterJoin}} function based on {{leftOuterJoin}} - see
> https://github.com/apache/solr/pull/3676.
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