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https://issues.apache.org/jira/browse/CALCITE-1681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15900889#comment-15900889
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Remus Rusanu commented on CALCITE-1681:
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Rex nodes have a RexCopier shuttle that does a deep copy into a new builder.
For Rel nodes my thinking is to create a similar RelShuttle. RelNode exposes a
{copy()} method but implementations clone themselves using their own cluster.
Perhaps a new method {RelNode.cloneTo(RelOptCluster targetCluster)} and
subtypes implement this appropriately, similar to how they override
{RelNode.copy()}.
> 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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