Struct parquet_format_async_temp::NullType
source · [−]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
sourceimpl NullType
impl NullType
pub fn new() -> NullType
pub fn read_from_in_protocol<T: TInputProtocol>(
i_prot: &mut T
) -> Result<NullType>
pub async fn stream_from_in_protocol<T: TInputStreamProtocol>(
i_prot: &mut T
) -> Result<NullType>
pub fn write_to_out_protocol<T: TOutputProtocol>(
&self,
o_prot: &mut T
) -> Result<usize>
pub async fn write_to_out_stream_protocol<T: TOutputStreamProtocol>(
&self,
o_prot: &mut T
) -> Result<usize>
Trait Implementations
sourceimpl Ord for NullType
impl Ord for NullType
sourceimpl PartialOrd<NullType> for NullType
impl PartialOrd<NullType> for NullType
sourcefn partial_cmp(&self, other: &NullType) -> Option<Ordering>
fn partial_cmp(&self, other: &NullType) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
1.0.0 · sourcefn lt(&self, other: &Rhs) -> bool
fn lt(&self, other: &Rhs) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
1.0.0 · sourcefn 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 more
impl Eq for NullType
impl StructuralEq for NullType
impl StructuralPartialEq for NullType
Auto Trait Implementations
impl RefUnwindSafe for NullType
impl Send for NullType
impl Sync for NullType
impl Unpin for NullType
impl UnwindSafe for NullType
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more