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https://issues.apache.org/jira/browse/CALCITE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17140023#comment-17140023
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Haisheng Yuan commented on CALCITE-4071:
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[~julianhyde] Let's completely remove {{replaceInput}} from {{RelNode}} then,
it is good for all. What do you think?
> Make RelNode Immutable
> ----------------------
>
> Key: CALCITE-4071
> URL: https://issues.apache.org/jira/browse/CALCITE-4071
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> Currently, RelNode is mutable, mainly in planner. That makes planner code
> error-prone, hard to maintain, and complicate the logic. Let's try to avoid
> using {{replaceInput}}, at least inside planner, and see if we can deprecate
> {{replaceInput}}. That will make planner more robust.
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