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Wang Yanlin commented on CALCITE-4071: -------------------------------------- I would suggest deprecate it first, actually, in company project I'm working on, we use replaceInput to do some change for RelNode. > 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. -- This message was sent by Atlassian Jira (v8.3.4#803005)