### Is your feature request related to a problem or challenge? @samuelcolvin notes on https://github.com/apache/datafusion/issues/11207 https://github.com/apache/datafusion/issues/11207#issuecomment-2206608686 > Given how much UserDefinedSQLPlanner is being used for existing stuff within datafusion, perhaps it should be called just SQLPlanner or CustomSQLPlanner? Since we haven't released this API yet, the name could be changed in the next few days before https://github.com/apache/datafusion/issues/11077 without causing too much downstream churn. ### Describe the solution you'd like I recommend renaming it to `ExprPlanner` as it is being used to plan specific exprs which seems good https://github.com/apache/datafusion/issues/11207#issuecomment-2207397190 ### Describe alternatives you've considered _No response_ ### Additional context _No response_