Struct parquet::encoding::DeltaBitPackEncoder [−][src]
pub struct DeltaBitPackEncoder<T: DataType> { /* fields omitted */ }
Expand description
Delta bit packed encoder. Consists of a header followed by blocks of delta encoded values binary packed.
Delta-binary-packing:
[page-header] [block 1], [block 2], ... [block N]
Each page header consists of:
[block size] [number of miniblocks in a block] [total value count] [first value]
Each block consists of:
[min delta] [list of bitwidths of miniblocks] [miniblocks]
Current implementation writes values in put
method, multiple calls to put
to
existing block or start new block if block size is exceeded. Calling flush_buffer
writes out all data and resets internal state, including page header.
Supports only INT32 and INT64.
Implementations
Trait Implementations
Auto Trait Implementations
impl<T> RefUnwindSafe for DeltaBitPackEncoder<T> where
T: RefUnwindSafe,
impl<T> Send for DeltaBitPackEncoder<T> where
T: Send,
impl<T> Sync for DeltaBitPackEncoder<T> where
T: Sync,
impl<T> Unpin for DeltaBitPackEncoder<T> where
T: Unpin,
impl<T> UnwindSafe for DeltaBitPackEncoder<T> where
T: UnwindSafe,