xudong963 commented on pull request #1183:
URL: https://github.com/apache/arrow-datafusion/pull/1183#issuecomment-954787474


   A summary of what the PR will do.
   
   1. Add a member variable such as `is_optimized` to LogicalPlan to avoid 
optimizing the logical plan twice.
   2. Avoid optimizing on different query executions twice, such as 
https://github.com/apache/arrow-datafusion/pull/1183#issuecomment-954605915
   
   About 1, I want to know if directly adding `is_optimized` to all logical 
plans is a good way? Do you have a more elegant idea?
   ```rust
   pub enum LogicalPlan {
       Projection {
          ...
           is_optimized: bool
       },
   
       Filter {
           ...
           is_optimized: bool
       },
       ...
   ```
   @Dandandan @alamb @houqp Please help me check my thought, thanks!


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