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https://issues.apache.org/jira/browse/CALCITE-2937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16801471#comment-16801471
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Ruben Quesada Lopez commented on CALCITE-2937:
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As discussed in the PRs ([here|https://github.com/apache/calcite/pull/1119] and
[here|https://github.com/apache/calcite/pull/1101]), there is no need to
implement this ticket, therefore I'll close it.
> 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
> Labels: pull-request-available
> Time Spent: 2h 50m
> Remaining Estimate: 0h
>
> 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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