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https://issues.apache.org/jira/browse/CALCITE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17140751#comment-17140751
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Haisheng Yuan commented on CALCITE-4071:
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lol. HepPlanner is indeed a tricky one, thanks for reminding.
I will try to remove most of the usages and deprecate the method first.
> 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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