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https://issues.apache.org/jira/browse/CALCITE-1681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901569#comment-15901569
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Julian Hyde commented on CALCITE-1681:
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The goal, I think, should be to copy a RelNode tree to a different cluster
(RelOptCluster). Especially in light of CALCITE-1536.
> Provide a way to copy RelNode trees between planners
> ----------------------------------------------------
>
> Key: CALCITE-1681
> URL: https://issues.apache.org/jira/browse/CALCITE-1681
> Project: Calcite
> Issue Type: Improvement
> Reporter: Remus Rusanu
> Assignee: Remus Rusanu
>
> In Hive we cache materialized view plans and reuse the cached plans in
> queries. For this we need a way to do deep clone copy of a RelNode tree from
> one builder to another.
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