Struct polars::export::arrow::datatypes::Field

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pub struct Field {
    pub name: String,
    pub data_type: DataType,
    pub is_nullable: bool,
    pub metadata: BTreeMap<String, String>,
}

Expand description

Represents Arrow’s metadata of a “column”.

A Field is the closest representation of the traditional “column”: a logical type (DataType) with a name and nullability. A Field has optional Metadata that can be used to annotate the field with custom metadata.

Almost all IO in this crate uses Field to represent logical information about the data to be serialized.

Fields

name: String

Its name

data_type: DataType

Its logical DataType

is_nullable: bool

Its nullability

metadata: BTreeMap<String, String>

Additional custom (opaque) metadata.

Implementations

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impl Field

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pub fn new<T>(name: T, data_type: DataType, is_nullable: bool) -> Field where
T: Into<String>,

Creates a new Field.

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pub fn with_metadata(self, metadata: BTreeMap<String, String>) -> Field

Creates a new Field with metadata.

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pub fn data_type(&self) -> &DataType

Returns the Field’s DataType.

Trait Implementations

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impl Clone for Field

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fn clone(&self) -> Field

Returns a copy of the value. Read more

1.0.0 · source

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

Performs copy-assignment from source. Read more

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impl Debug for Field

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

Formats the value using the given formatter. Read more

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impl<'_> From<&'_ Field> for Field

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fn from(f: &Field) -> Field

Performs the conversion.

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impl Hash for Field

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

Feeds this value into the given Hasher. Read more

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

Feeds a slice of this type into the given Hasher. Read more

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impl PartialEq<Field> for Field

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

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

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

This method tests for !=.

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impl Eq for Field

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impl StructuralEq for Field

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impl StructuralPartialEq for Field

Auto Trait Implementations

impl RefUnwindSafe for Field

impl Send for Field

impl Sync for Field

impl Unpin for Field

impl UnwindSafe for Field

Blanket Implementations

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impl<T> Any for T where
T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> CallHasher for T where
T: Hash + ?Sized,

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default fn get_hash<H, B>(value: &H, build_hasher: &B) -> u64 where
H: Hash + ?Sized,
B: BuildHasher,

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impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T where
U: From<T>,

const: unstable · source

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.

type Init = T

The type for initializers.

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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more

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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more

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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more

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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more

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impl<T> ToOwned for T where
T: Clone,

type Owned = T

The resulting type after obtaining ownership.

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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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fn clone_into(&self, target: &mut T)

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

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impl<T, U> TryFrom for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

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impl<V, T> VZip<V> for T where
V: MultiLane<T>,

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Struct polars::export::arrow::datatypes::Field

Fields

Implementations

impl Field

pub fn new<T>(name: T, data_type: DataType, is_nullable: bool) -> Field where T: Into<String>,

pub fn with_metadata(self, metadata: BTreeMap<String, String>) -> Field

pub fn data_type(&self) -> &DataType

Trait Implementations

impl Clone for Field

fn clone(&self) -> Field

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

impl Debug for Field

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

impl<'_> From<&'_ Field> for Field

fn from(f: &Field) -> Field

impl Hash for Field

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

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

impl PartialEq<Field> for Field

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

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

impl Eq for Field

impl StructuralEq for Field

impl StructuralPartialEq for Field

Auto Trait Implementations

impl RefUnwindSafe for Field

impl Send for Field

impl Sync for Field

impl Unpin for Field

impl UnwindSafe for Field

Blanket Implementations

impl<T> Any for T where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> CallHasher for T where T: Hash + ?Sized,

default fn get_hash<H, B>(value: &H, build_hasher: &B) -> u64 where H: Hash + ?Sized, B: BuildHasher,

impl<Q, K> Equivalent<K> for Q where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

fn equivalent(&self, key: &K) -> bool

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for T where U: From<T>,

fn into(self) -> U

impl<T> Pointable for T

const ALIGN: usize

type Init = T

unsafe fn init(init: <T as Pointable>::Init) -> usize

unsafe fn deref<'a>(ptr: usize) -> &'a T

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

unsafe fn drop(ptr: usize)

impl<T> ToOwned for T where T: Clone,

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<V, T> VZip<V> for T where V: MultiLane<T>,

fn vzip(self) -> V

pub fn new<T>(name: T, data_type: DataType, is_nullable: bool) -> Field where
T: Into<String>,

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

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

impl<T> Any for T where
T: 'static + ?Sized,

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<T> CallHasher for T where
T: Hash + ?Sized,

default fn get_hash<H, B>(value: &H, build_hasher: &B) -> u64 where
H: Hash + ?Sized,
B: BuildHasher,

impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,

impl<T, U> Into<U> for T where
U: From<T>,

impl<T> ToOwned for T where
T: Clone,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

impl<V, T> VZip<V> for T where
V: MultiLane<T>,