Struct ColumnValueDecoderImpl 

pub struct ColumnValueDecoderImpl<T: DataType> {
    descr: ColumnDescPtr,
    current_encoding: Option<Encoding>,
    decoder_mask: EncodingMask,
    decoders: [Option<Box<dyn Decoder<T>>>; 10],
}

An implementation of ColumnValueDecoder for [T::T]

Fields

descr: ColumnDescPtr

current_encoding: Option<Encoding>

decoder_mask: EncodingMask

Cache of decoders for existing encodings. Uses EncodingMask and dense storage keyed by encoding discriminant.

decoders: [Option<Box<dyn Decoder<T>>>; 10]

Trait Implementations

impl<T: DataType> ColumnValueDecoder for ColumnValueDecoderImpl<T>

type Buffer = Vec<<T as DataType>::T>

fn new(descr: &ColumnDescPtr) -> Self

Create a new ColumnValueDecoder

fn set_dict( &mut self, buf: Bytes, num_values: u32, encoding: Encoding, _is_sorted: bool, ) -> Result<()>

Set the current dictionary page

fn set_data( &mut self, encoding: Encoding, data: Bytes, num_levels: usize, num_values: Option<usize>, ) -> Result<()>

Set the current data page

fn read(&mut self, out: &mut Self::Buffer, num_values: usize) -> Result<usize>

Read up to num_values values into out

fn skip_values(&mut self, num_values: usize) -> Result<usize>

Skips over num_values values