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https://issues.apache.org/jira/browse/CALCITE-2937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16797467#comment-16797467
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Julian Hyde commented on CALCITE-2937:
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An {{Enumerable}} is basically a supplier of an {{Enumerator}}. So, this seems
to be adding another level of indirection, which is not necessary.
Is there a way to finesse this, with a 2-line sub-class of
{{AbstractEnumerable}} or {{AbstractEnumerable2}}?
> 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: 10m
> 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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