NGA-TRAN commented on PR #4490:
URL: 
https://github.com/apache/arrow-datafusion/pull/4490#issuecomment-1341510514

   @alamb : I have addressed all your comments. Can you re-review it?
   
   Notes: If you run queries in DataFusion-cli, you will get error 
`Internal("Unsupported logical plan: Prepare")`. I think this means we are 
successfully create a LogicalPlan::Prepare (the purpose of this PR) but since 
we have not store it anywhere and have not implement physical plan for it, we 
get this error naturally.
   
   Example:
   
   ```SQL
   cd datafusion-cli 
   cargo run
   DataFusion CLI v15.0.0
   ❯ PREPARE my_plan(INT) AS SELECT $1
   ;
   Internal("Unsupported logical plan: Prepare")
   ❯ 
   ```


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