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Posted to dev@calcite.apache.org by "Ruben Quesada Lopez (JIRA)" <ji...@apache.org> on 2019/03/20 08:28:00 UTC

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

Ruben Quesada Lopez created CALCITE-2937:
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             Summary: 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


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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