Function rename

crates/expr/src/rls.rs:362–364

Helper for renaming a relvar

(relvar: &mut Relvar, f: &mut impl FnMut(&RawIdentifier) -> RawIdentifier)

fn alpha_rename(expr: &mut RelExpr, f: &mut impl FnMut(&RawIdentifier) -> RawIdentifier) {
    /// Helper for renaming a relvar
    fn rename(relvar: &mut Relvar, f: &mut impl FnMut(&RawIdentifier) -> RawIdentifier) {
        relvar.alias = f(&relvar.alias);
    }
    /// Helper for renaming a field reference
    fn rename_field(field: &mut FieldProject, f: &mut impl FnMut(&RawIdentifier) -> RawIdentifier) {
        field.table = f(&field.table);