Struct parquet_format_async_temp::NullType

pub struct NullType {}

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

impl NullType

pub fn new() -> NullType

pub fn read_from_in_protocol(
    i_prot: &mut dyn TInputProtocol
) -> Result<NullType>

pub async fn stream_from_in_protocol(
    i_prot: &mut dyn TInputStreamProtocol
) -> Result<NullType>

pub fn write_to_out_protocol(
    &self,
    o_prot: &mut dyn TOutputProtocol
) -> Result<usize>

pub async fn write_to_out_stream_protocol(
    &self,
    o_prot: &mut dyn TOutputStreamProtocol
) -> Result<usize>

Trait Implementations

impl Clone for NullType

fn clone(&self) -> NullType

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NullType

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for NullType

fn default() -> Self

Returns the “default value” for a type.

impl Hash for NullType

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl Ord for NullType

fn cmp(&self, other: &NullType) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<NullType> for NullType

fn eq(&self, other: &NullType) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialOrd<NullType> for NullType

fn partial_cmp(&self, other: &NullType) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for NullType

impl StructuralEq for NullType

impl StructuralPartialEq for NullType