andygrove commented on a change in pull request #8097:
URL: https://github.com/apache/arrow/pull/8097#discussion_r484555554



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File path: rust/datafusion/src/execution/context.rs
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@@ -375,15 +380,39 @@ impl ScalarFunctionRegistry for ExecutionContext {
     }
 }
 
+/// Provides OptimizerRule instances to

Review comment:
       I think I would prefer `Provider` to `Source` in this context. Also, 
would be good to document whether these are logical or physical optimizer rules.




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