alamb commented on code in PR #16066:
URL: https://github.com/apache/datafusion/pull/16066#discussion_r2093568326
##########
datafusion/optimizer/src/common_subexpr_eliminate.rs:
##########
@@ -316,6 +316,19 @@ impl CommonSubexprEliminate {
} => {
let rewritten_aggr_expr =
new_exprs_list.pop().unwrap();
let new_aggr_expr = original_exprs_list.pop().unwrap();
+ let saved_names = if let Some(aggr_expr) = aggr_expr {
+ let name_preserver =
NamePreserver::new_for_projection();
+ aggr_expr
+ .iter()
+ .map(|expr| Some(name_preserver.save(expr)))
+ .collect::<Vec<_>>()
+ } else {
+ new_aggr_expr
Review Comment:
Is this the same as a vec of all None?
```rust
vec![None; new_agg_expr.len()]`
```
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