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https://issues.apache.org/jira/browse/SOLR-8198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dennis Gove closed SOLR-8198.
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Resolution: Implemented
Fix Version/s: Trunk
> Change ReducerStream to use StreamEqualitor instead of StreamComparator
> -----------------------------------------------------------------------
>
> Key: SOLR-8198
> URL: https://issues.apache.org/jira/browse/SOLR-8198
> Project: Solr
> Issue Type: Improvement
> Components: SolrJ
> Reporter: Dennis Gove
> Assignee: Dennis Gove
> Priority: Minor
> Fix For: Trunk
>
> Attachments: SOLR-8198.patch, SOLR-8198.patch
>
>
> Currently the ReducerStream uses a StreamComparator to determine whether
> tuples are equal. StreamEqualitors are a simplified version of a comparator
> in that they do not require a sort to be provided. Using the function
> getStreamSort we are still able to validate the incoming stream's sort and
> pass that on up to any parent stream which might require it.
> This will simplify the use of the ReducerStream in join scenarios where the
> reducer is used to find like records. Such a scenario exists with Inner/Outer
> JoinStream, ComplementStream, and [Outer]HashJoinStreams.
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