Haisheng Yuan created CALCITE-4071:
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Summary: 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
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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