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https://issues.apache.org/jira/browse/SOLR-7525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065531#comment-15065531
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Jason Gerlowski commented on SOLR-7525:
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Hey Dennis, question about the new patch.
Is there a reason that {{DistinctOperation}} was created with a ctor taking in
a {{StreamExpression}} and a {{StreamFactory}}? Is there a reason that both
ctors call into an empty {{init()}} function? Is that a consistency/style thing
that we're trying to stick to in this part of the code (keep all the
{{ReduceOperation}} implementations structured similarly). Or is there a
technical reason for this?
Other than that question, everything looks good to me.
> Add ComplementStream to the Streaming API and Streaming Expressions
> -------------------------------------------------------------------
>
> Key: SOLR-7525
> URL: https://issues.apache.org/jira/browse/SOLR-7525
> Project: Solr
> Issue Type: New Feature
> Components: SolrJ
> Reporter: Joel Bernstein
> Priority: Minor
> Attachments: SOLR-7525.patch, SOLR-7525.patch, SOLR-7525.patch
>
>
> This ticket adds a ComplementStream to the Streaming API and Streaming
> Expression language.
> The ComplementStream will wrap two TupleStreams (StreamA, StreamB) and emit
> Tuples from StreamA that are not in StreamB.
> Streaming API Syntax:
> {code}
> ComplementStream cstream = new ComplementStream(streamA, streamB, comp);
> {code}
> Streaming Expression syntax:
> {code}
> complement(search(...), search(...), on(...))
> {code}
> Internal implementation will rely on the ReducerStream. The ComplementStream
> can be parallelized using the ParallelStream.
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