Trait parquet::encoding::Encoder[−][src]

pub trait Encoder<T: DataType> {
    fn put(&mut self, values: &[T::T]) -> Result<()>;

    fn encoding(&self) -> Encoding;

    fn estimated_data_encoded_size(&self) -> usize;

    fn flush_buffer(&mut self) -> Result<ByteBufferPtr>;

    fn put_spaced(
        &mut self, 
        values: &[T::T], 
        valid_bits: &[u8]
    ) -> Result<usize> { ... }
}
Expand description

An Parquet encoder for the data type T.

Currently this allocates internal buffers for the encoded values. After done putting values, caller should call flush_buffer() to get an immutable buffer pointer.

Required methods

Encodes data from values.

Returns the encoding type of this encoder.

Returns an estimate of the encoded data, in bytes. Method call must be O(1).

Flushes the underlying byte buffer that’s being processed by this encoder, and return the immutable copy of it. This will also reset the internal state.

Provided methods

Encodes data from values, which contains spaces for null values, that is identified by valid_bits.

Returns the number of non-null values encoded.

Implementors