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https://issues.apache.org/jira/browse/SOLR-17923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18021696#comment-18021696
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Andy Webb commented on SOLR-17923:
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I'd love to get folks' thoughts on this please!
(I'd like to add more to the documentation update - it's really just a
copy/paste of the `leftOuterJoin` docs currently which doesn't illustrate the
change in `fullOuterJoin`.)
> 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
> Time Spent: 20m
> 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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