docteurklein commented on issue #1475:
URL:
https://github.com/apache/datafusion-sqlparser-rs/issues/1475#issuecomment-2613924635
here is an example to change ASC to DESC in some order by:
```rust
struct VisitOrderBy {
reorder: Vec<String>,
}
impl VisitorMut for VisitOrderBy {
type Break = ();
fn post_visit_query(&mut self, expr: &mut Query) ->
ControlFlow<Self::Break> {
if let Query { order_by: Some(o), ..} = expr {
o.exprs.iter_mut().for_each(|e| {
if let Expr::Identifier(Ident {value: v, ..}) =
e.expr.to_owned() {
if self.reorder.contains(&v) {
e.asc = e.asc.map(|a| !a);
}
}
});
}
ControlFlow::Continue(())
}
}
let mut statements = Parser::parse_sql(&GenericDialect{},
&query.sql).unwrap();
statements.visit(&mut VisitOrderBy {reorder: query.reorder.clone()});
```
dunno if that helps!
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