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https://issues.apache.org/jira/browse/CALCITE-1637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869449#comment-15869449
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Julian Hyde commented on CALCITE-1637:
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It's that old chestnut: do you publish code as a re-usable API when you realize
it could be general-purpose, or do you wait until you have a second user? I
wouldn't wait for a second user if it the code's purpose is easy to explain and
the API is straightforward.
I think that the Mutable rels are in that category. If we move them to a
separate package that has a clear and simple purpose it makes all of the code
easier to understand.
> Add missing MutableRels for all relational expressions
> ------------------------------------------------------
>
> Key: CALCITE-1637
> URL: https://issues.apache.org/jira/browse/CALCITE-1637
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.11.0
> Reporter: Maryann Xue
> Assignee: Maryann Xue
> Fix For: 1.12.0
>
>
> Missing MutableRels include:
> MutableCalc,
> MutableCollect,
> MutableCorrelate,
> MutableExchange,
> MutableIntersect,
> MutableMinus,
> MutableSample,
> MutableSemiJoin,
> MutableTableFunctionScan,
> MutableTableModify,
> MutableUncollect,
> MutableWindow
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