pub struct CoalesceFunc { /* private fields */ }
Implementations§
Source§impl CoalesceFunc
impl CoalesceFunc
Trait Implementations§
Source§impl Debug for CoalesceFunc
impl Debug for CoalesceFunc
Source§impl Default for CoalesceFunc
impl Default for CoalesceFunc
Source§impl Hash for CoalesceFunc
impl Hash for CoalesceFunc
Source§impl PartialEq for CoalesceFunc
impl PartialEq for CoalesceFunc
Source§impl ScalarUDFImpl for CoalesceFunc
impl ScalarUDFImpl for CoalesceFunc
Source§fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue>
fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue>
coalesce evaluates to the first value which is not NULL
Source§fn signature(&self) -> &Signature
fn signature(&self) -> &Signature
Returns a
Signature
describing the argument types for which this
function has an implementation, and the function’s Volatility
. Read moreSource§fn return_field_from_args(&self, args: ReturnFieldArgs<'_>) -> Result<FieldRef>
fn return_field_from_args(&self, args: ReturnFieldArgs<'_>) -> Result<FieldRef>
What type will be returned by this function, given the arguments? 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. Read moreSource§fn coerce_types(&self, arg_types: &[DataType]) -> Result<Vec<DataType>>
fn coerce_types(&self, arg_types: &[DataType]) -> Result<Vec<DataType>>
Coerce arguments of a function call to types that the function can evaluate. Read more
Source§fn documentation(&self) -> Option<&Documentation>
fn documentation(&self) -> Option<&Documentation>
Returns the documentation for this Scalar UDF. Read more
Source§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>
👎Deprecated since 50.0.0: This method is unused and will be removed in a future release
Returns the user-defined display name of function, given the arguments Read more
Source§fn schema_name(&self, args: &[Expr]) -> Result<String, DataFusionError>
fn schema_name(&self, args: &[Expr]) -> Result<String, DataFusionError>
Returns the name of the column this expression would create Read more
Source§fn is_nullable(&self, _args: &[Expr], _schema: &dyn ExprSchema) -> bool
fn is_nullable(&self, _args: &[Expr], _schema: &dyn ExprSchema) -> bool
👎Deprecated since 45.0.0: Use
return_field_from_args
instead. if you use is_nullable
that returns non-nullable with return_type
, you would need to switch to return_field_from_args
, you might have errorSource§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 evaluate_bounds(
&self,
_input: &[&Interval],
) -> Result<Interval, DataFusionError>
fn evaluate_bounds( &self, _input: &[&Interval], ) -> Result<Interval, DataFusionError>
Source§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>
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 preserves_lex_ordering(
&self,
_inputs: &[ExprProperties],
) -> Result<bool, DataFusionError>
fn preserves_lex_ordering( &self, _inputs: &[ExprProperties], ) -> Result<bool, DataFusionError>
Returns true if the function preserves lexicographical ordering based on
the input ordering. Read more
impl Eq for CoalesceFunc
impl StructuralPartialEq for CoalesceFunc
Auto Trait Implementations§
impl Freeze for CoalesceFunc
impl !RefUnwindSafe for CoalesceFunc
impl Send for CoalesceFunc
impl Sync for CoalesceFunc
impl Unpin for CoalesceFunc
impl !UnwindSafe for CoalesceFunc
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<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to
key
and return true
if they are equal.Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
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