Struct polars::prelude::ArrowSchema

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pub struct ArrowSchema {
    pub fields: Vec<Field, Global>,
    pub metadata: BTreeMap<String, String>,
}

Expand description

An ordered sequence of Fields with associated Metadata.

Schema is an abstration used to read from, and write to, Arrow IPC format, Apache Parquet, and Apache Avro. All these formats have a concept of a schema with fields and metadata.

Fields

fields: Vec<Field, Global>

The fields composing this schema.

metadata: BTreeMap<String, String>

Optional metadata.

Implementations

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impl Schema

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

Attaches a Metadata to Schema

Trait Implementations

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impl Clone for Schema

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fn clone(&self) -> Schema

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 Schema

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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 Default for Schema

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fn default() -> Schema

Returns the “default value” for a type. Read more

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impl From<Vec<Field, Global>> for Schema

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fn from(fields: Vec<Field, Global>) -> Schema

Performs the conversion.

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impl IndexOfSchema for Schema

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fn index_of(&self, name: &str) -> Option<usize>

Get the index of column by name.

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fn try_index_of(&self, name: &str) -> Result<usize, PolarsError>

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impl PartialEq<Schema> for Schema

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

This method tests for !=.

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impl Eq for Schema

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impl StructuralEq for Schema

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impl StructuralPartialEq for Schema

Auto Trait Implementations

impl RefUnwindSafe for Schema

impl Send for Schema

impl Sync for Schema

impl Unpin for Schema

impl UnwindSafe for Schema

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<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::prelude::ArrowSchema

Fields

Implementations

impl Schema

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

Trait Implementations

impl Clone for Schema

fn clone(&self) -> Schema

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

impl Debug for Schema

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

impl Default for Schema

fn default() -> Schema

impl From<Vec<Field, Global>> for Schema

fn from(fields: Vec<Field, Global>) -> Schema

impl IndexOfSchema for Schema

fn index_of(&self, name: &str) -> Option<usize>

fn try_index_of(&self, name: &str) -> Result<usize, PolarsError>

impl PartialEq<Schema> for Schema

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

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

impl Eq for Schema

impl StructuralEq for Schema

impl StructuralPartialEq for Schema

Auto Trait Implementations

impl RefUnwindSafe for Schema

impl Send for Schema

impl Sync for Schema

impl Unpin for Schema

impl UnwindSafe for Schema

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<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

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<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>,