alamb commented on code in PR #5661:
URL: https://github.com/apache/arrow-datafusion/pull/5661#discussion_r1151112892


##########
datafusion/core/src/physical_plan/joins/symmetric_hash_join.rs:
##########
@@ -399,10 +393,14 @@ impl ExecutionPlan for SymmetricHashJoinExec {
         self.schema.clone()
     }
 
-    fn required_input_ordering(&self) -> Vec<Option<&[PhysicalSortExpr]>> {
+    fn required_input_ordering(&self) -> 
Vec<Option<Vec<PhysicalSortRequirement>>> {

Review Comment:
   > This refactor is not large in terms of LOCs (~250 lines change, almost 
entirely consisting of simple substitutions), but it touches almost 50 files! 
So we may want to leave it to a follow-on too -- I am fine with either.
   
   Thank you for doing this test
   
   I think starting with type aliases is a good thing (and we can potentially 
turn them into actual types later on if that would be helpful).
   



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