alamb commented on code in PR #5607:
URL: https://github.com/apache/arrow-datafusion/pull/5607#discussion_r1137331638
##########
datafusion/optimizer/src/eliminate_duplicated_expr.rs:
##########
@@ -41,15 +42,28 @@ impl OptimizerRule for EliminateDuplicatedExpr {
) -> Result<Option<LogicalPlan>> {
match plan {
LogicalPlan::Sort(sort) => {
+ let normalized_sort_keys = sort
+ .expr
+ .iter()
+ .map(|e| match e {
+ Expr::Sort(ExprSort { expr, .. }) => {
+ Expr::Sort(ExprSort::new(expr.clone(), true,
false))
Review Comment:
I am not sure about always using `true`, `fase`
Using the example
```sql
select * from t1 order by id desc, id, name, id asc;
select * from t1 order by id asc, id, name, id desc;
```
Is the sort key always the same ? It seems like in the first query the sort
key should be `id desc, name` and the second it should be `id asc, name`
Maybe I am missing something
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