Struct polars::export::arrow::io::parquet::read::schema::SchemaDescriptor

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pub struct SchemaDescriptor { /* private fields */ }

This is supported on crate feature io_parquet only.

Expand description

A schema descriptor. This encapsulates the top-level schemas for all the columns, as well as all descriptors for all the primitive columns.

Implementations

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impl SchemaDescriptor

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pub fn new(name: String, fields: Vec<ParquetType, Global>) -> SchemaDescriptor

Creates new schema descriptor from Parquet schema.

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pub fn column(&self, i: usize) -> &ColumnDescriptor

Returns ColumnDescriptor for a field position.

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pub fn columns(&self) -> &[ColumnDescriptor ]

Returns slice of ColumnDescriptor.

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pub fn num_columns(&self) -> usize

Returns number of leaf-level columns.

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pub fn name(&self) -> &str

Returns schema name.

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pub fn fields(&self) -> &[ParquetType ]

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pub fn try_from_message(message: &str) -> Result<SchemaDescriptor, ParquetError>

Trait Implementations

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impl Clone for SchemaDescriptor

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fn clone(&self) -> SchemaDescriptor

Returns a copy of the value. Read more

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

Performs copy-assignment from source. Read more

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impl Debug for SchemaDescriptor

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

Formats the value using the given formatter. Read more

Auto Trait Implementations

impl RefUnwindSafe for SchemaDescriptor

impl Send for SchemaDescriptor

impl Sync for SchemaDescriptor

impl Unpin for SchemaDescriptor

impl UnwindSafe for SchemaDescriptor

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> 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::io::parquet::read::schema::SchemaDescriptor

Implementations

impl SchemaDescriptor

pub fn new(name: String, fields: Vec<ParquetType, Global>) -> SchemaDescriptor

pub fn column(&self, i: usize) -> &ColumnDescriptor

pub fn columns(&self) -> &[ColumnDescriptor]

pub fn num_columns(&self) -> usize

pub fn name(&self) -> &str

pub fn fields(&self) -> &[ParquetType]

pub fn try_from_message(message: &str) -> Result<SchemaDescriptor, ParquetError>

Trait Implementations

impl Clone for SchemaDescriptor

fn clone(&self) -> SchemaDescriptor

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

impl Debug for SchemaDescriptor

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

Auto Trait Implementations

impl RefUnwindSafe for SchemaDescriptor

impl Send for SchemaDescriptor

impl Sync for SchemaDescriptor

impl Unpin for SchemaDescriptor

impl UnwindSafe for SchemaDescriptor

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> 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 columns(&self) -> &[ColumnDescriptor ]

pub fn fields(&self) -> &[ParquetType ]

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, 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>,