[−][src]Enum parquet::basic::Encoding

[+] Show declaration

pub enum Encoding {
    PLAIN,
    PLAIN_DICTIONARY,
    RLE,
    BIT_PACKED,
    DELTA_BINARY_PACKED,
    DELTA_LENGTH_BYTE_ARRAY,
    DELTA_BYTE_ARRAY,
    RLE_DICTIONARY,
}

[−]

Encodings supported by Parquet. Not all encodings are valid for all types. These enums are also used to specify the encoding of definition and repetition levels.

Variants

PLAIN

[−]

Default byte encoding.

BOOLEAN - 1 bit per value, 0 is false; 1 is true.
INT32 - 4 bytes per value, stored as little-endian.
INT64 - 8 bytes per value, stored as little-endian.
FLOAT - 4 bytes per value, stored as little-endian.
DOUBLE - 8 bytes per value, stored as little-endian.
BYTE_ARRAY - 4 byte length stored as little endian, followed by bytes.
FIXED_LEN_BYTE_ARRAY - just the bytes are stored.

PLAIN_DICTIONARY

[−]

Deprecated dictionary encoding.

The values in the dictionary are encoded using PLAIN encoding. Since it is deprecated, RLE_DICTIONARY encoding is used for a data page, and PLAIN encoding is used for dictionary page.

RLE

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Group packed run length encoding.

Usable for definition/repetition levels encoding and boolean values.

BIT_PACKED

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Bit packed encoding.

This can only be used if the data has a known max width. Usable for definition/repetition levels encoding.

DELTA_BINARY_PACKED

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Delta encoding for integers, either INT32 or INT64.

Works best on sorted data.

DELTA_LENGTH_BYTE_ARRAY

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Encoding for byte arrays to separate the length values and the data.

The lengths are encoded using DELTA_BINARY_PACKED encoding.

DELTA_BYTE_ARRAY

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Incremental encoding for byte arrays.

Prefix lengths are encoded using DELTA_BINARY_PACKED encoding. Suffixes are stored using DELTA_LENGTH_BYTE_ARRAY encoding.

RLE_DICTIONARY

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Dictionary encoding.

The ids are encoded using the RLE encoding.

Trait Implementations

`impl PartialEq<Encoding> for Encoding`
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`fn eq(&self, other: &Encoding) -> bool`
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This method tests for self and other values to be equal, and is used by ==. Read more

`[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> bool`
1.0.0
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This method tests for !=.

`impl From<Encoding> for Encoding`
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`fn from(value: Encoding) -> Self`
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Performs the conversion.

`impl From<Encoding> for Encoding`
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`fn from(value: Encoding) -> Self`
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Performs the conversion.

`impl Clone for Encoding`
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`fn clone(&self) -> Encoding`
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Returns a copy of the value. Read more

`fn clone_from(&mut self, source: &Self)`
1.0.0
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Performs copy-assignment from source. Read more

`impl Copy for Encoding`
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`impl Debug for Encoding`
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`fn fmt(&self, f: &mut Formatter) -> Result`
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Formats the value using the given formatter. Read more

`impl Display for Encoding`
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`fn fmt(&self, f: &mut Formatter) -> Result`
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Formats the value using the given formatter. Read more

`impl Hash for Encoding`
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`fn hash<H: Hasher>(&self, state: &mut H)`
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Feeds this value into the given [Hasher]. Read more

`fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher,`
1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

Auto Trait Implementations

Blanket Implementations

`impl<T, U> Into for T where U: From<T>,`
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`fn into(self) -> U`
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Performs the conversion.

`impl<T> ToString for T where T: Display + ?Sized,`
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`fn to_string(&self) -> String`
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Converts the given value to a String. Read more

`impl<T> ToOwned for T where T: Clone,`
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`type Owned = T`

`fn to_owned(&self) -> T`
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Creates owned data from borrowed data, usually by cloning. Read more

`fn clone_into(&self, target: &mut T)`
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🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

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

`impl<T> From for T`
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`fn from(t: T) -> T`
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Performs the conversion.

`impl<T, U> TryFrom for T where T: From,`
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`type Error = !`

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

The type returned in the event of a conversion error.

`fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>`
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🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

`impl<T> Borrow for T where T: ?Sized,`
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`fn borrow(&self) -> &T`
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Immutably borrows from an owned value. Read more

`impl<T, U> TryInto for T where U: TryFrom<T>,`
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`type Error = >::Error`

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

The type returned in the event of a conversion error.

`fn try_into(self) -> Result<U, >::Error>`
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🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

`impl<T> BorrowMut for T where T: ?Sized,`
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`fn borrow_mut(&mut self) -> &mut T`
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Mutably borrows from an owned value. Read more

`impl<T> Any for T where T: 'static + ?Sized,`
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`fn get_type_id(&self) -> TypeId`
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🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

`impl<T, U> TryInto for T where U: TryFrom<T>,`
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`type Err = >::Err`

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

`impl<E> SpecializationError for E`
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`fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where T: ?Sized,`
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🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

[−][src]Enum parquet::basic::Encoding

Variants

Trait Implementations

impl PartialEq<Encoding> for Encoding[src][+]

fn eq(&self, other: &Encoding) -> bool[src][−]

[+] Expand attributes#[must_use] fn ne(&self, other: &Rhs) -> bool1.0.0[src][−]

impl From<Encoding> for Encoding[src][+]

fn from(value: Encoding) -> Self[src][−]

impl From<Encoding> for Encoding[src][+]

fn from(value: Encoding) -> Self[src][−]

impl Clone for Encoding[src][+]

fn clone(&self) -> Encoding[src][−]

fn clone_from(&mut self, source: &Self)1.0.0[src][−]

impl Copy for Encoding[src]

impl Eq for Encoding[src]

impl Debug for Encoding[src][+]

fn fmt(&self, f: &mut Formatter) -> Result[src][−]

impl Display for Encoding[src][+]

fn fmt(&self, f: &mut Formatter) -> Result[src][−]

impl Hash for Encoding[src][+]

fn hash<__H: Hasher>(&self, state: &mut __H)[src][−]

fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher, 1.3.0[src][−]

Auto Trait Implementations

impl Send for Encoding

impl Sync for Encoding

Blanket Implementations

impl<T, U> Into for T where U: From<T>, [src][−]

fn into(self) -> U[src][−]

impl<T> ToString for T where T: Display + ?Sized, [src][−]

fn to_string(&self) -> String[src][−]

impl<T> ToOwned for T where T: Clone, [src][−]

type Owned = T

fn to_owned(&self) -> T[src][−]

fn clone_into(&self, target: &mut T)[src][−]

impl<T> From for T[src][−]

fn from(t: T) -> T[src][−]

impl<T, U> TryFrom for T where T: From<U>, [src][−]

type Error = !

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

impl<T> Borrow for T where T: ?Sized, [src][−]

fn borrow(&self) -> &T[src][−]

impl<T, U> TryInto for T where U: TryFrom<T>, [src][−]

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

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

impl<T> BorrowMut for T where T: ?Sized, [src][−]

fn borrow_mut(&mut self) -> &mut T[src][−]

impl<T> Any for T where T: 'static + ?Sized, [src][−]

fn get_type_id(&self) -> TypeId[src][−]

impl<T, U> TryInto for T where U: TryFrom<T>, [−]

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

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

impl<E> SpecializationError for E[src][−]

fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where T: ?Sized, [src][−]

impl<T> Erased for T[src]

impl<T> Send for T where T: ?Sized, [src]

impl<T> Sync for T where T: ?Sized, [src]

impl<T> Erased for T

`impl PartialEq<Encoding> for Encoding`
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`fn eq(&self, other: &Encoding) -> bool`
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`[+] Expand attributes #[must_use] fn ne(&self, other: &Rhs) -> bool`
1.0.0
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`impl From<Encoding> for Encoding`
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`fn from(value: Encoding) -> Self`
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`impl From<Encoding> for Encoding`
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`fn from(value: Encoding) -> Self`
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`impl Clone for Encoding`
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`fn clone(&self) -> Encoding`
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`fn clone_from(&mut self, source: &Self)`
1.0.0
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`impl Copy for Encoding`
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`impl Eq for Encoding`
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`impl Debug for Encoding`
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`fn fmt(&self, f: &mut Formatter) -> Result`
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`impl Display for Encoding`
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`fn fmt(&self, f: &mut Formatter) -> Result`
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`impl Hash for Encoding`
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`fn hash<H: Hasher>(&self, state: &mut H)`
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`fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher,`
1.3.0
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`impl Send for Encoding`

`impl Sync for Encoding`

`impl<T, U> Into for T where U: From<T>,`
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`fn into(self) -> U`
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`impl<T> ToString for T where T: Display + ?Sized,`
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`fn to_string(&self) -> String`
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`impl<T> ToOwned for T where T: Clone,`
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`type Owned = T`

`fn to_owned(&self) -> T`
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`fn clone_into(&self, target: &mut T)`
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`impl<T> From for T`
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`fn from(t: T) -> T`
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`impl<T, U> TryFrom for T where T: From<U>,`
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`type Error = !`

`fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`
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`impl<T> Borrow for T where T: ?Sized,`
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`fn borrow(&self) -> &T`
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`impl<T, U> TryInto for T where U: TryFrom<T>,`
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`type Error = <U as TryFrom<T>>::Error`

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`
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`impl<T> BorrowMut for T where T: ?Sized,`
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`fn borrow_mut(&mut self) -> &mut T`
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`impl<T> Any for T where T: 'static + ?Sized,`
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`fn get_type_id(&self) -> TypeId`
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`impl<T, U> TryInto for T where U: TryFrom<T>,`
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`type Err = <U as TryFrom<T>>::Err`

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

`impl<E> SpecializationError for E`
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`fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where T: ?Sized,`
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`impl<T> Erased for T`
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`impl<T> Send for T where T: ?Sized,`
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`impl<T> Sync for T where T: ?Sized,`
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`impl<T> Erased for T`