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https://issues.apache.org/jira/browse/CALCITE-2937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ruben Quesada Lopez reassigned CALCITE-2937:
--------------------------------------------
Assignee: Ruben Quesada Lopez
> Linq4j: implement LazyEnumerable
> --------------------------------
>
> Key: CALCITE-2937
> URL: https://issues.apache.org/jira/browse/CALCITE-2937
> Project: Calcite
> Issue Type: New Feature
> Reporter: Ruben Quesada Lopez
> Assignee: Ruben Quesada Lopez
> Priority: Major
>
> Implement a LazyEnumerable: an Enumerable whose computation (via a Supplier)
> will be
> postponed until it is actually required. An example of use case could be
> CALCITE-2909, where a semiJoin implementation can be optimized by delaying
> the computation of the innerLookup until the moment when we are sure that it
> will be really needed, i.e. when the first outer enumerator item is processed.
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