peter-toth commented on code in PR #10868:
URL: https://github.com/apache/datafusion/pull/10868#discussion_r1635197808


##########
datafusion/optimizer/src/common_subexpr_eliminate.rs:
##########
@@ -515,14 +522,15 @@ fn build_common_expr_project_plan(
     let mut fields_set = BTreeSet::new();
     let mut project_exprs = common_exprs
         .into_iter()
-        .map(|(expr_id, expr)| {
+        .enumerate()
+        .map(|(index, (expr_id, expr))| {

Review Comment:
   I've updated the example plans a bit in my previous comment to show the 
issue with `#0` alias chosen 2 times (in 2 different optimizer rule runs).



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