Enum SqlFunctionArgsRef 

pub enum SqlFunctionArgsRef<'a> {
    Star,
    List(&'a [Expr]),
    Pair(&'a Expr, &'a Expr),
}

A borrowed view of SQL function arguments.

Self::Pair exposes the operands of Expr::JsonAccess as function arguments without allocating or changing the parser’s owned AST shape.

Variants

Star

func(*) — distinct from an empty argument list even though its arity is zero.

List(&'a [Expr])

A contiguous argument list borrowed from FunctionArgs::List.

Pair(&'a Expr, &'a Expr)

Two non-contiguous arguments, used by the JSON access operators.

Implementations

impl<'a> SqlFunctionArgsRef<'a>

pub const fn len(self) -> usize

Return the number of expressions supplied to the function.

func(*) has zero expression arguments. Use Self::is_star when the distinction between Star and an empty List matters.

pub const fn is_empty(self) -> bool

Return whether there are no expression arguments.

pub fn arity_i32(self) -> i32

Return the registry-compatible signed arity, saturating at i32::MAX.

pub const fn is_star(self) -> bool

Return whether these arguments represent func(*).

pub fn get(self, index: usize) -> Option<&'a Expr>

Borrow the argument at index, if one exists.

pub fn first(self) -> Option<&'a Expr>

Borrow the first argument, if one exists.

pub fn iter( self, ) -> impl DoubleEndedIterator<Item = &'a Expr> + ExactSizeIterator + Clone

Iterate over the argument expressions without allocating.

pub const fn as_list(self) -> Option<&'a [Expr]>

Return the underlying contiguous list, when this view is a list.

Star and Pair return None; callers that only need traversal should use Self::iter.

pub fn to_owned(self) -> FunctionArgs

Materialize this borrowed view as the parser’s owned argument type.

Trait Implementations

impl<'a> Clone for SqlFunctionArgsRef<'a>

fn clone(&self) -> SqlFunctionArgsRef<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Copy for SqlFunctionArgsRef<'a>

impl<'a> Debug for SqlFunctionArgsRef<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> PartialEq for SqlFunctionArgsRef<'a>

fn eq(&self, other: &SqlFunctionArgsRef<'a>) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<'a> StructuralPartialEq for SqlFunctionArgsRef<'a>