adriangb commented on PR #15766:
URL: https://github.com/apache/datafusion/pull/15766#issuecomment-2823040352

   I didn't have time to do the initialization diagram but here is execution:
   
   ```
                      ┌─────────────────────┐                 
                      │                     │                 
                      │   DataSourceExec    │                 
                      │                     │                 
                      └─────────────────────┘                 
                                 │                            
                                 │                            
                      ┌──────────▼──────────┐                 
                      │                     │                 
                      │     DataSource      │                 
                      │                     │                 
                      └─────────────────────┘                 
                                 │                            
              ┌──────────────────┴────────────────┐           
   ┌──────────▼──────────┐             ┌──────────▼──────────┐
   │                     │             │                     │
   │   FileScanConfig    │             │ MemorySourceConfig  │
   │                     │             │                     │
   └─────────────────────┘             └─────────────────────┘
              │                                               
              │                                               
              │                                               
   ┌──────────▼──────────┐                                    
   │                     │                                    
   │     FileSource      │                                    
   │                     │                                    
   └─────────────────────┘                                    
              │                                               
              │                                               
              │                                               
   ┌──────────▼──────────┐                                    
   │     ArrowSource     │                                    
   │         ...         │                                    
   │    ParquetSource    │                                    
   └─────────────────────┘                                    
              │                                               
              │                                               
              │                                               
   ┌──────────▼──────────┐                                    
   │                     │                                    
   │    ParquetOpener    │                                    
   │                     │                                    
   └─────────────────────┘                                    
              │                                               
              │                                               
              │                                               
   ┌──────────▼──────────┐                                    
   │                     │                                    
   │ RecordBatch Stream  │                                    
   │                     │                                    
   └─────────────────────┘                                    
   ```


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