peter-toth commented on code in PR #10868:
URL: https://github.com/apache/datafusion/pull/10868#discussion_r1638090840
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datafusion/optimizer/src/common_subexpr_eliminate.rs:
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@@ -166,6 +166,15 @@ impl CommonSubexprEliminate {
) -> Result<(Vec<Vec<Expr>>, LogicalPlan)> {
let mut common_exprs = IndexMap::new();
+ input.schema().iter().for_each(|(qualifier, field)| {
Review Comment:
We need a solution that can produce a unique alias fast. There is no problem
with having gaps if we can do it constant time (vs. no gaps with linear time to
the number of common expressions).
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