[Enhancement](Nereids)refactor plan node into plan + operator #9623
Description
Search before asking
- I had searched in the issues and found no similar issues.
Description
immutable plan node is difficult to use, should separate it into two parts, one is immutable, another is mutable.
Solution
Expression: Mutable, include child and others parts
Operator: Immutable, include relational algebra related parts
Are you willing to submit PR?
- Yes I am willing to submit a PR!
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