Struct polars::export::arrow::io::parquet::read::DataPage

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pub struct DataPage { /* private fields */ }

This is supported on crate feature io_parquet only.

Expand description

A DataPage is an uncompressed, encoded representation of a Parquet data page. It holds actual data and thus cloning it is expensive.

Implementations

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impl DataPage

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pub fn new(
 header: DataPageHeader,
 buffer: Vec<u8, Global>,
 dictionary_page: Option<Arc<dyn DictPage + 'static>>,
 descriptor: ColumnDescriptor
) -> DataPage

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pub fn dictionary_page(&self) -> Option<&Arc<dyn DictPage + 'static>>

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pub fn buffer(&self) -> &[u8 ]ⓘNotable traits for &'_ [u8 ]`impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8]`

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pub fn buffer_mut(&mut self) -> &mut Vec<u8, Global>ⓘNotable traits for Vec<u8, A>`impl<A> Write for Vec<u8, A> where A: Allocator,`

Returns a mutable reference to the internal buffer. Useful to recover the buffer after the page has been decoded.

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pub fn statistics(
&self
) -> Option<Result<Arc<dyn Statistics + 'static>, ParquetError>>

Decodes the raw statistics into a statistics

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pub fn descriptor(&self) -> &ColumnDescriptor

Trait Implementations

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impl Clone for DataPage

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fn clone(&self) -> DataPage

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 DataPage

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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 Decompressed for DataPage

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fn buffer_mut(&mut self) -> &mut Vec<u8, Global>ⓘNotable traits for Vec<u8, A>`impl<A> Write for Vec<u8, A> where A: Allocator,`

Auto Trait Implementations

impl !RefUnwindSafe for DataPage

impl Send for DataPage

impl Sync for DataPage

impl Unpin for DataPage

impl !UnwindSafe for DataPage

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::DataPage

Implementations

impl DataPage

pub fn new( header: DataPageHeader, buffer: Vec<u8, Global>, dictionary_page: Option<Arc<dyn DictPage + 'static>>, descriptor: ColumnDescriptor) -> DataPage

pub fn header(&self) -> &DataPageHeader

pub fn dictionary_page(&self) -> Option<&Arc<dyn DictPage + 'static>>

pub fn buffer(&self) -> &[u8]ⓘNotable traits for &'_ [u8]impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8]

pub fn buffer_mut(&mut self) -> &mut Vec<u8, Global>ⓘNotable traits for Vec<u8, A>impl<A> Write for Vec<u8, A> where A: Allocator,

pub fn num_values(&self) -> usize

pub fn encoding(&self) -> Encoding

pub fn definition_level_encoding(&self) -> Encoding

pub fn repetition_level_encoding(&self) -> Encoding

pub fn statistics( &self) -> Option<Result<Arc<dyn Statistics + 'static>, ParquetError>>

pub fn descriptor(&self) -> &ColumnDescriptor

Trait Implementations

impl Clone for DataPage

fn clone(&self) -> DataPage

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

impl Debug for DataPage

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

impl Decompressed for DataPage

fn buffer_mut(&mut self) -> &mut Vec<u8, Global>ⓘNotable traits for Vec<u8, A>impl<A> Write for Vec<u8, A> where A: Allocator,

Auto Trait Implementations

impl !RefUnwindSafe for DataPage

impl Send for DataPage

impl Sync for DataPage

impl Unpin for DataPage

impl !UnwindSafe for DataPage

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 new(
header: DataPageHeader,
buffer: Vec<u8, Global>,
dictionary_page: Option<Arc<dyn DictPage + 'static>>,
descriptor: ColumnDescriptor
) -> DataPage

pub fn buffer(&self) -> &[u8 ]ⓘNotable traits for &'_ [u8 ]`impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8]`

pub fn buffer_mut(&mut self) -> &mut Vec<u8, Global>ⓘNotable traits for Vec<u8, A>`impl<A> Write for Vec<u8, A> where A: Allocator,`

pub fn statistics(
&self
) -> Option<Result<Arc<dyn Statistics + 'static>, ParquetError>>

fn buffer_mut(&mut self) -> &mut Vec<u8, Global>ⓘNotable traits for Vec<u8, A>`impl<A> Write for Vec<u8, A> where A: Allocator,`

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>,