Revert "fix(9870): common expression elimination optimization, should always re-find the correct expression during re-write. (apache#9871)"

This reverts commit cd7a00b.

Author: peter-toth

datafusion/expr/src/logical_plan/plan.rs

@@ -2245,7 +2245,7 @@ impl DistinctOn {
 
 /// Aggregates its input based on a set of grouping and aggregate
 /// expressions (e.g. SUM).
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+#[derive(Clone, PartialEq, Eq, Hash)]
 // mark non_exhaustive to encourage use of try_new/new()
 #[non_exhaustive]
 pub struct Aggregate {