alamb commented on code in PR #12022:
URL: https://github.com/apache/datafusion/pull/12022#discussion_r1719085598


##########
datafusion/physical-plan/src/aggregates/mod.rs:
##########
@@ -128,14 +128,14 @@ impl AggregateMode {
 #[derive(Clone, Debug, Default)]
 pub struct PhysicalGroupBy {
     /// Distinct (Physical Expr, Alias) in the grouping set
-    expr: Vec<(Arc<dyn PhysicalExpr>, String)>,
+    pub expr: Vec<(Arc<dyn PhysicalExpr>, String)>,

Review Comment:
   A potentially more future proof API might be to make accessors for these 
fields
   
   like 
   ```rust
   pub fn null_expr(&self) -> &[...]
   ```



##########
datafusion/physical-plan/src/aggregates/order/full.rs:
##########
@@ -142,3 +142,9 @@ impl GroupOrderingFull {
         std::mem::size_of::<Self>()
     }
 }
+
+impl Default for GroupOrderingFull {

Review Comment:
   👍 



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