Struct datafusion::functions::unicode::character_length::CharacterLengthFunc
source · pub struct CharacterLengthFunc { /* private fields */ }
Implementations§
source§impl CharacterLengthFunc
impl CharacterLengthFunc
pub fn new() -> CharacterLengthFunc
Trait Implementations§
source§impl Debug for CharacterLengthFunc
impl Debug for CharacterLengthFunc
source§impl Default for CharacterLengthFunc
impl Default for CharacterLengthFunc
source§fn default() -> CharacterLengthFunc
fn default() -> CharacterLengthFunc
Returns the “default value” for a type. Read more
source§impl ScalarUDFImpl for CharacterLengthFunc
impl ScalarUDFImpl for CharacterLengthFunc
source§fn signature(&self) -> &Signature
fn signature(&self) -> &Signature
Returns the function’s
Signature
for information about what input
types are accepted and the function’s Volatility.source§fn return_type(
&self,
arg_types: &[DataType],
) -> Result<DataType, DataFusionError>
fn return_type( &self, arg_types: &[DataType], ) -> Result<DataType, DataFusionError>
source§fn invoke(
&self,
args: &[ColumnarValue],
) -> Result<ColumnarValue, DataFusionError>
fn invoke( &self, args: &[ColumnarValue], ) -> Result<ColumnarValue, DataFusionError>
Invoke the function on
args
, returning the appropriate result Read moresource§fn aliases(&self) -> &[String]
fn aliases(&self) -> &[String]
Returns any aliases (alternate names) for this function. Read more
source§fn display_name(&self, args: &[Expr]) -> Result<String, DataFusionError>
fn display_name(&self, args: &[Expr]) -> Result<String, DataFusionError>
Returns the user-defined display name of the UDF given the arguments
source§fn return_type_from_exprs(
&self,
_args: &[Expr],
_schema: &dyn ExprSchema,
arg_types: &[DataType],
) -> Result<DataType, DataFusionError>
fn return_type_from_exprs( &self, _args: &[Expr], _schema: &dyn ExprSchema, arg_types: &[DataType], ) -> Result<DataType, DataFusionError>
source§fn invoke_no_args(
&self,
_number_rows: usize,
) -> Result<ColumnarValue, DataFusionError>
fn invoke_no_args( &self, _number_rows: usize, ) -> Result<ColumnarValue, DataFusionError>
Invoke the function without
args
, instead the number of rows are provided,
returning the appropriate result.source§fn simplify(
&self,
args: Vec<Expr>,
_info: &dyn SimplifyInfo,
) -> Result<ExprSimplifyResult, DataFusionError>
fn simplify( &self, args: Vec<Expr>, _info: &dyn SimplifyInfo, ) -> Result<ExprSimplifyResult, DataFusionError>
Optionally apply per-UDF simplification / rewrite rules. Read more
source§fn short_circuits(&self) -> bool
fn short_circuits(&self) -> bool
Returns true if some of this
exprs
subexpressions may not be evaluated
and thus any side effects (like divide by zero) may not be encountered
Setting this to true prevents certain optimizations such as common subexpression eliminationsource§fn evaluate_bounds(
&self,
_input: &[&Interval],
) -> Result<Interval, DataFusionError>
fn evaluate_bounds( &self, _input: &[&Interval], ) -> Result<Interval, DataFusionError>
Computes the output interval for a
ScalarUDFImpl
, given the input
intervals. Read moresource§fn propagate_constraints(
&self,
_interval: &Interval,
_inputs: &[&Interval],
) -> Result<Option<Vec<Interval>>, DataFusionError>
fn propagate_constraints( &self, _interval: &Interval, _inputs: &[&Interval], ) -> Result<Option<Vec<Interval>>, DataFusionError>
Updates bounds for child expressions, given a known interval for this
function. This is used to propagate constraints down through an expression
tree. Read more
source§fn output_ordering(
&self,
_inputs: &[ExprProperties],
) -> Result<SortProperties, DataFusionError>
fn output_ordering( &self, _inputs: &[ExprProperties], ) -> Result<SortProperties, DataFusionError>
Calculates the
SortProperties
of this function based on its
children’s properties.source§fn coerce_types(
&self,
_arg_types: &[DataType],
) -> Result<Vec<DataType>, DataFusionError>
fn coerce_types( &self, _arg_types: &[DataType], ) -> Result<Vec<DataType>, DataFusionError>
Coerce arguments of a function call to types that the function can evaluate. Read more
Auto Trait Implementations§
impl Freeze for CharacterLengthFunc
impl RefUnwindSafe for CharacterLengthFunc
impl Send for CharacterLengthFunc
impl Sync for CharacterLengthFunc
impl Unpin for CharacterLengthFunc
impl UnwindSafe for CharacterLengthFunc
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> 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