xinlifoobar commented on issue #10521:
URL: https://github.com/apache/datafusion/issues/10521#issuecomment-2115020694
I think from the `Vec<Expr>` could not mapping back to the only unique
`Vec<Vec<Expr>>` and hence unparse the cube statement would be difficult. How
about store another copy of origin Vec in the Cube and Rollup instance? i.e.,
```rs
pub enum GroupingSet {
/// Rollup grouping sets
Rollup(Vec<Expr>, Vec<Vec<Expr>>),
/// Cube grouping sets
Cube(Vec<Expr>, Vec<Vec<Expr>>),
/// User-defined grouping sets
GroupingSets(Vec<Vec<Expr>>),
}
```
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