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

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pub struct ColumnChunkMetaData { /* private fields */ }

This is supported on crate feature io_parquet only.

Expand description

Metadata for a column chunk.

Implementations

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impl ColumnChunkMetaData

Represents common operations for a column chunk.

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pub fn new(
column_chunk: ColumnChunk,
column_descr: ColumnDescriptor
) -> ColumnChunkMetaData

Create a new ColumnChunkMetaData

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pub fn file_path(&self) -> &Option<String>

File where the column chunk is stored.

If not set, assumed to belong to the same file as the metadata. This path is relative to the current file.

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pub fn file_offset(&self) -> i64

Byte offset in file_path().

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pub fn type_(&self) -> &Type

Type of this column. Must be primitive.

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pub fn descriptor(&self) -> &ColumnDescriptor

The ColumnDescriptor for this column. This descriptor contains the physical and logical type of the pages.

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pub fn physical_type(&self) -> PhysicalType

The ColumnDescriptor for this column. This descriptor contains the physical and logical type of the pages.

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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 num_values(&self) -> i64

Total number of values in this column chunk.

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pub fn compression(&self) -> Compression

Compression for this column.

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pub fn compressed_size(&self) -> i64

Returns the total compressed data size of this column chunk.

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pub fn uncompressed_size(&self) -> i64

Returns the total uncompressed data size of this column chunk.

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pub fn data_page_offset(&self) -> i64

Returns the offset for the column data.

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pub fn has_index_page(&self) -> bool

Returns true if this column chunk contains a index page, false otherwise.

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pub fn index_page_offset(&self) -> Option<i64>

Returns the offset for the index page.

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pub fn dictionary_page_offset(&self) -> Option<i64>

Returns the offset for the dictionary page, if any.

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

Returns the encoding for this column

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pub fn byte_range(&self) -> (u64, u64 )

Returns the offset and length in bytes of the column chunk within the file

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pub fn try_from_thrift(
column_descr: ColumnDescriptor,
column_chunk: ColumnChunk
) -> Result<ColumnChunkMetaData, ParquetError>

Method to convert from Thrift.

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pub fn into_thrift(self) -> ColumnChunk

Method to convert to Thrift.

Trait Implementations

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impl Clone for ColumnChunkMetaData

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fn clone(&self) -> ColumnChunkMetaData

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 ColumnChunkMetaData

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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 ColumnChunkMetaData

impl Send for ColumnChunkMetaData

impl Sync for ColumnChunkMetaData

impl Unpin for ColumnChunkMetaData

impl UnwindSafe for ColumnChunkMetaData

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::ColumnChunkMetaData

Implementations

impl ColumnChunkMetaData

pub fn new( column_chunk: ColumnChunk, column_descr: ColumnDescriptor) -> ColumnChunkMetaData

pub fn file_path(&self) -> &Option<String>

pub fn file_offset(&self) -> i64

pub fn type_(&self) -> &Type

pub fn descriptor(&self) -> &ColumnDescriptor

pub fn physical_type(&self) -> PhysicalType

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

pub fn num_values(&self) -> i64

pub fn compression(&self) -> Compression

pub fn compressed_size(&self) -> i64

pub fn uncompressed_size(&self) -> i64

pub fn data_page_offset(&self) -> i64

pub fn has_index_page(&self) -> bool

pub fn index_page_offset(&self) -> Option<i64>

pub fn dictionary_page_offset(&self) -> Option<i64>

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

pub fn byte_range(&self) -> (u64, u64)

pub fn try_from_thrift( column_descr: ColumnDescriptor, column_chunk: ColumnChunk) -> Result<ColumnChunkMetaData, ParquetError>

pub fn into_thrift(self) -> ColumnChunk

Trait Implementations

impl Clone for ColumnChunkMetaData

fn clone(&self) -> ColumnChunkMetaData

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

impl Debug for ColumnChunkMetaData

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

Auto Trait Implementations

impl RefUnwindSafe for ColumnChunkMetaData

impl Send for ColumnChunkMetaData

impl Sync for ColumnChunkMetaData

impl Unpin for ColumnChunkMetaData

impl UnwindSafe for ColumnChunkMetaData

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(
column_chunk: ColumnChunk,
column_descr: ColumnDescriptor
) -> ColumnChunkMetaData

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

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

pub fn byte_range(&self) -> (u64, u64 )

pub fn try_from_thrift(
column_descr: ColumnDescriptor,
column_chunk: ColumnChunk
) -> Result<ColumnChunkMetaData, ParquetError>

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>,