Function unary_prec

src/sql-parser/src/ast/defs/expr.rs:721–727

The precedence at which a prefix operator (`Op` with no second operand) parses its operand, mirroring `Parser::parse_prefix`: `-`/`+` at `PrefixPlusMinus`, but `~` (and namespaced prefixes) at `Other`, so `~ a + b` parses as `~ (a + b)`. `~` binds looser than `+`/`-`/`*`.

(op: &Op)

/// `PrefixPlusMinus`, but `~` (and namespaced prefixes) at `Other`, so `~ a + b`
/// parses as `~ (a + b)`. `~` binds looser than `+`/`-`/`*`.
fn unary_prec(op: &Op) -> u8 {
    if op.namespace.is_none() && (op.op == "-" || op.op == "+") {
        prec::PREFIX
    } else {
        prec::OTHER
    }
}

/// The loosest precedence exposed on `expr`'s *right spine*, the precedence at
/// which an operator printed immediately to its right would bind *into* it