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Posted to issues@calcite.apache.org by "Ruben Quesada Lopez (JIRA)" <ji...@apache.org> on 2019/03/26 08:12:00 UTC

[jira] [Closed] (CALCITE-2937) Linq4j: implement LazyEnumerable

     [ https://issues.apache.org/jira/browse/CALCITE-2937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ruben Quesada Lopez closed CALCITE-2937.
----------------------------------------
    Resolution: Won't Do

> 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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