[−][src]Struct parquet::decoding::DictDecoder
Dictionary decoder.
The dictionary encoding builds a dictionary of values encountered in a given column.
The dictionary is be stored in a dictionary page per column chunk.
See DictEncoder for more information.
Methods
impl<T: DataType> DictDecoder<T>[src]
impl<T: DataType> DictDecoder<T>pub fn new() -> Self[src]
pub fn new() -> SelfCreates new dictionary decoder.
pub fn set_dict(&mut self, decoder: Box<dyn Decoder<T>>) -> Result<()>[src]
pub fn set_dict(&mut self, decoder: Box<dyn Decoder<T>>) -> Result<()>Decodes and sets values for dictionary using decoder decoder.
Trait Implementations
impl<T: DataType> Decoder<T> for DictDecoder<T>[src]
impl<T: DataType> Decoder<T> for DictDecoder<T>fn set_data(&mut self, data: ByteBufferPtr, num_values: usize) -> Result<()>[src]
fn set_data(&mut self, data: ByteBufferPtr, num_values: usize) -> Result<()>Sets the data to decode to be data, which should contain num_values of values to decode. Read more
fn get(&mut self, buffer: &mut [T::T]) -> Result<usize>[src]
fn get(&mut self, buffer: &mut [T::T]) -> Result<usize>Consumes values from this decoder and write the results to buffer. This will try to fill up buffer. Read more
fn values_left(&self) -> usize[src]
fn values_left(&self) -> usizeNumber of values left in this decoder stream
fn encoding(&self) -> Encoding[src]
fn encoding(&self) -> EncodingReturns the encoding for this decoder.
Auto Trait Implementations
impl<T> !Send for DictDecoder<T>
impl<T> !Send for DictDecoder<T>impl<T> !Sync for DictDecoder<T>
impl<T> !Sync for DictDecoder<T>Blanket Implementations
impl<T, U> Into for T where
U: From<T>, [src]
impl<T, U> Into for T where
U: From<T>, impl<T> From for T[src]
impl<T> From for Timpl<T, U> TryFrom for T where
T: From<U>, [src]
impl<T, U> TryFrom for T where
T: From<U>, type Error = !
try_from)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>try_from)Performs the conversion.
impl<T> Borrow for T where
T: ?Sized, [src]
impl<T> Borrow for T where
T: ?Sized, impl<T, U> TryInto for T where
U: TryFrom<T>, [src]
impl<T, U> TryInto for T where
U: TryFrom<T>, type Error = <U as TryFrom<T>>::Error
try_from)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>try_from)Performs the conversion.
impl<T> BorrowMut for T where
T: ?Sized, [src]
impl<T> BorrowMut for T where
T: ?Sized, fn borrow_mut(&mut self) -> &mut T[src]
fn borrow_mut(&mut self) -> &mut TMutably borrows from an owned value. Read more
impl<T> Any for T where
T: 'static + ?Sized, [src]
impl<T> Any for T where
T: 'static + ?Sized, fn get_type_id(&self) -> TypeId[src]
fn get_type_id(&self) -> TypeId🔬 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>,
impl<T, U> TryInto for T where
U: TryFrom<T>, impl<E> SpecializationError for E[src]
impl<E> SpecializationError for Efn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized, [src]
fn not_found<S, T>(trait_name: &'static str, method_name: &'static str) -> E where
T: ?Sized, 🔬 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
impl<T> Erased for T[src]
impl<T> Erased for Timpl<T> Send for T where
T: ?Sized, [src]
impl<T> Send for T where
T: ?Sized, impl<T> Sync for T where
T: ?Sized, [src]
impl<T> Sync for T where
T: ?Sized, impl<T> Erased for T
impl<T> Erased for T