Visualizing Calcite query plans

[Sree harsha R]

I have generally found Calcite query plans easy to understand. 
But when the complexity of the plan increases (think 7 table join with multiple 
join conditions), it becomes difficult to understand the complexity. 
Is there a good way to visualize the plans? 
I have used Graphviz to see the shapes of plans when they are generated 
internally. But I don't want to enable logging whenever I need to understand a 
complicated plan. 
---Thank YouHarsha