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https://issues.apache.org/jira/browse/SOLR-8763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein resolved SOLR-8763.
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Resolution: Duplicate
> Add EvalStream to support "computing on the code" use cases
> -----------------------------------------------------------
>
> Key: SOLR-8763
> URL: https://issues.apache.org/jira/browse/SOLR-8763
> Project: Solr
> Issue Type: New Feature
> Reporter: Joel Bernstein
> Priority: Minor
>
> Streaming Expression presents interesting opportunities for "computing on the
> code". The EvalStream will call toExpression() on an underlying stream and
> then compile and run the resulting expression. This will allow developers to
> write Streaming Expressions that dynamically build other Streaming
> Expressions.
> This type of behavior could probably be already done in the open() method,
> but having an EvalStream adds specific support for dynamic generation of
> Streaming Expressions and should encourage these types of applications.
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