pub struct LeftFunction;Expand description
LEFT function - returns the leftmost n characters from a string
Trait Implementations§
Source§impl Default for LeftFunction
impl Default for LeftFunction
Source§fn default() -> LeftFunction
fn default() -> LeftFunction
Returns the “default value” for a type. Read more
Source§impl ScalarFunction for LeftFunction
impl ScalarFunction for LeftFunction
Source§fn info(&self) -> FunctionInfo
fn info(&self) -> FunctionInfo
Get function information
Source§fn evaluate(&self, args: &[Value]) -> Result<Value>
fn evaluate(&self, args: &[Value]) -> Result<Value>
Evaluate the function with the given arguments
Source§fn clone_box(&self) -> Box<dyn ScalarFunction>
fn clone_box(&self) -> Box<dyn ScalarFunction>
Clone the function into a new instance
Source§fn native_fn1(&self) -> Option<NativeFn1>
fn native_fn1(&self) -> Option<NativeFn1>
Optional: Return a direct function pointer for single-arg functions.
When Some, compiler emits direct call (no dynamic dispatch).
Default is None (uses evaluate() with dynamic dispatch).
Auto Trait Implementations§
impl Freeze for LeftFunction
impl RefUnwindSafe for LeftFunction
impl Send for LeftFunction
impl Sync for LeftFunction
impl Unpin for LeftFunction
impl UnsafeUnpin for LeftFunction
impl UnwindSafe for LeftFunction
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
Source§impl<T> CompactArcDrop for T
impl<T> CompactArcDrop for T
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
Converts
self into a Left variant of Either<Self, Self>
if into_left is true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
self into a Left variant of Either<Self, Self>
if into_left(&self) returns true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read more