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FixedPerValueDecompressor

lance_encoding::compression

Trait FixedPerValueDecompressor 

Source 
pub trait FixedPerValueDecompressor:
    Debug
    + Send
    + Sync {
    // Required methods
    fn decompress(
        &self,
        data: FixedWidthDataBlock,
        num_values: u64,
    ) -> Result<DataBlock>;
    fn bits_per_value(&self) -> u64;

    // Provided method
    fn decoded_size_bytes(&self, _num_values: u64) -> Option<u64> { ... }
}

Required Methods§

Source

fn decompress( &self, data: FixedWidthDataBlock, num_values: u64, ) -> Result<DataBlock>

Decompress one or more values

Source

fn bits_per_value(&self) -> u64

The number of bits in each value

Currently (and probably long term) this must be a multiple of 8

Provided Methods§

Source

fn decoded_size_bytes(&self, _num_values: u64) -> Option<u64>

Returns the exact aggregate decoded size when it is determined solely by the value count.

Implementations should only return Some when this aggregate estimate can be used by DataBlockBuilder to preallocate the decoded output exactly. Outputs with multiple buffers or whose layout-dependent allocation cannot be represented by one aggregate estimate should return None.

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§