Method visit_expr_mut

src/sql/src/pure.rs:3000–3023

(&mut self, expr: &'_ mut Expr<Aug>)

impl VisitMut<'_, Aug> for MzNowPurifierVisitor {
    fn visit_expr_mut(&mut self, expr: &'_ mut Expr<Aug>) {
        match expr {
            Expr::Function(Function {
                name:
                    ResolvedItemName::Item {
                        full_name: FullItemName { item, .. },
                        ..
                    },
                ..
            }) if item == &MZ_NOW_NAME.to_string() => {
                let mz_now = self.mz_now.expect(
                    "we should have chosen a timestamp if the expression contains mz_now()",
                );
                // We substitute `mz_now()` with number + a cast to `mz_timestamp`. The cast is to
                // not alter the type of the expression.
                *expr = Expr::Cast {
                    expr: Box::new(Expr::Value(Value::Number(mz_now.to_string()))),
                    data_type: self.mz_timestamp_type.clone(),
                };
                self.introduced_mz_timestamp = true;
            }
            _ => visit_expr_mut(self, expr),
        }
    }
}