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https://issues.apache.org/jira/browse/CALCITE-6050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde reassigned CALCITE-6050:
------------------------------------

    Assignee: Julian Hyde

> Add interface ImmutablePairList
> -------------------------------
>
>                 Key: CALCITE-6050
>                 URL: https://issues.apache.org/jira/browse/CALCITE-6050
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>            Priority: Major
>
> In CALCITE-5706, we added {{class PairList}}; in this change, we add 
> {{ImmutablePairList}}, which is optimized for cases where the list does not 
> change after creation. The implementation stores entries in an array, rather 
> than a list, saving memory allocations and indirection.
> {{PairList}} and {{ImmutablePairList}} are now interfaces; this allows us to 
> have multiple implementations that do not have a common base class.



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