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https://issues.apache.org/jira/browse/SOLR-9916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862546#comment-15862546
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Dennis Gove commented on SOLR-9916:
-----------------------------------
I've added descriptions of each evaluator to Trunk Changes at
https://cwiki.apache.org/confluence/display/solr/Internal+-+Trunk+Changes+to+Document.
I'll move these to the true location after 6.4 has been cut.
> Add arithmetic operations to the SelectStream
> ---------------------------------------------
>
> Key: SOLR-9916
> URL: https://issues.apache.org/jira/browse/SOLR-9916
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Joel Bernstein
> Assignee: Dennis Gove
> Attachments: SOLR-9916.patch, SOLR-9916.patch, SOLR-9916.patch
>
>
> One of the things that will be needed as the SQL implementation matures is
> the ability to do arithmetic operations. For example:
> select (a+b) from x;
> select sum(a)+sum(b) from x;
> We will need to support arithmetic operations within the Streaming API to
> support these types of operations.
> It looks like adding arithmetic operations to the SelectStream is the best
> place to add this functionality.
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