[GitHub] [arrow] ArianaVillegas opened a new pull request #12031: ARROW-15138: [C++] Make ExecPlan::ToString give some additional information

[GitBox]

ArianaVillegas opened a new pull request #12031:
URL: https://github.com/apache/arrow/pull/12031


   Add indentation to ToString() function in ExecPlan. 
   
   For example if we have the following graph of execution plan:
   
![image](https://user-images.githubusercontent.com/40250321/147159958-79ad4ad4-db3d-435e-bf01-bb5ea1162730.png)
   
   The execution plan string will be:
   ```
   6 node
       5 node
            4 node
                2 node
            3 node
                2 node
                1 node
   ```
    
   


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