alamb opened a new pull request #8098:
URL: https://github.com/apache/arrow/pull/8098


   The idea is to continue to simplify the code and improve performance: the 
inputs to nodes are often copied and using Box requires unnecessary deep copies
   
   I view this as another step towards having LogicalPlan's be made up of 
`Arc<dyn LogicalPlanNode>` to mirror how `ExecutionPlan`s work


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