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https://issues.apache.org/jira/browse/SOLR-8337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15114395#comment-15114395
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Joel Bernstein commented on SOLR-8337:
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It was conflicting with the count metric function call and it was only being 
used for some very early test cases. I just removed it a changed the test cases.

> Add ReduceOperation and wire it into the ReducerStream
> ------------------------------------------------------
>
>                 Key: SOLR-8337
>                 URL: https://issues.apache.org/jira/browse/SOLR-8337
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Joel Bernstein
>         Attachments: SOLR-8337.patch, SOLR-8337.patch, SOLR-8337.patch, 
> SOLR-8337.patch, SOLR-8337.patch
>
>
> The current ReducerStream groups all documents that share the same key(s) 
> into a list and emits a single Tuple that contains this list. There is no way 
> to tell the ReducerStream to do something more interesting with groups, for 
> example summing a column within a group, or joining tuples. 
> This ticket adds a new type of operation called a ReduceOperation which is 
> passed to the ReducerStream so that the reduce behavior can be specialized.
> The ReduceOperation has two methods:
> 1) operate(Tuple) : This is called once for each Tuple in a group. This 
> method can be used to aggregate Tuples as they added to a group. 
> 2) reduce() : This is called when the group keys change. This method returns 
> a single Tuple which is output by the ReducerStream. The ReduceOperation must 
> clear it's internal structures when reduce is called as well, to prepare for 
> the next group.



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