xiedeyantu opened a new pull request, #4812:
URL: https://github.com/apache/calcite/pull/4812

   See 
[CALCITE-7420](https://github.com/apache/calcite/commit/21dd59061fb0284d0f13f5aac7e588a29cefb1c2)
   
   This PR represents the first step.
   Implementing the relevant control commands. The new command is named 
`!rule-plan`. We avoided the `!plan-xxx` naming convention because Quidem's 
built-in command parser treats any command starting with "plan" as a reserved 
keyword.
   An empty rule set is denoted by an empty string `""` rather than `NONE`. 
This design choice eliminates the need for special-case handling of `NONE` in 
the code and avoids the overhead of filtering it out during reflective rule 
instance generation.


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