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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 updated CALCITE-2937:
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Description:
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.
was:
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.
> 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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