pub struct NullType {}
Expand description
Logical type to annotate a column that is always null.
Sometimes when discovering the schema of existing data, values are always null and the physical type can’t be determined. This annotation signals the case where the physical type was guessed from all null values.
Implementations§
Trait Implementations§
source§impl Ord for NullType
impl Ord for NullType
source§impl PartialEq for NullType
impl PartialEq for NullType
source§impl PartialOrd for NullType
impl PartialOrd for NullType
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self
and other
) and is used by the <=
operator. Read moresource§impl TSerializable for NullType
impl TSerializable for NullType
fn read_from_in_protocol<T>(i_prot: &mut T) -> Result<NullType, Error>where
T: TInputProtocol,
fn write_to_out_protocol<T>(&self, o_prot: &mut T) -> Result<(), Error>where
T: TOutputProtocol,
impl Eq for NullType
impl StructuralPartialEq for NullType
Auto Trait Implementations§
impl Freeze for NullType
impl RefUnwindSafe for NullType
impl Send for NullType
impl Sync for NullType
impl Unpin for NullType
impl UnwindSafe for NullType
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> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
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<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
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 moreCreates a shared type from an unshared type.