alan910127 commented on issue #13642:
URL: https://github.com/apache/datafusion/issues/13642#issuecomment-2632903421
I've found that the sort isn't actually planned as a single-column sort. The
`expressions` in this case contains multiple columns:
```rust
// SQL: row_number() over (partition by id6 order by v3 desc)
LexOrdering {
inner: [
PhysicalSortExpr {
expr: Column { name: "id6", index: 0 },
options: SortOptions { descending: false, nulls_first: false }
},
PhysicalSortExpr {
expr: Column { name: "v3", index: 1 },
options: SortOptions { descending: true, nulls_first: true }
}
]
}
```
I'm not sure whether this behavior is expected or if the plan should have
used a single-column sort optimization in this case.
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