Enum Compression

pub enum Compression {
    UNCOMPRESSED,
    SNAPPY,
    GZIP(GzipLevel),
    LZO,
    BROTLI(BrotliLevel),
    LZ4,
    ZSTD(ZstdLevel),
    LZ4_RAW,
}

Supported block compression algorithms.

Block compression can yield non-trivial improvements to storage efficiency at the expense of potentially significantly worse encode and decode performance. Many applications, especially those making use of high-throughput and low-cost commodity object storage, may find storage efficiency less important than decode throughput, and therefore may wish to not make use of block compression.

The writers in this crate default to no block compression for this reason.

Applications that do still wish to use block compression, will find Compression::ZSTD to provide a good balance of compression, performance, and ecosystem support. Alternatively, Compression::LZ4_RAW provides much faster decompression speeds, at the cost of typically worse compression ratios. However, it is not as widely supported by the ecosystem, with the Hadoop ecosystem historically favoring the non-standard and now deprecated Compression::LZ4.

Variants

UNCOMPRESSED

No compression.

SNAPPY

Snappy compression

GZIP(GzipLevel)

Gzip compression

LZO

LZO compression

BROTLI(BrotliLevel)

Brotli compression

LZ4

LZ4 compression, (deprecated)

ZSTD(ZstdLevel)

ZSTD compression

LZ4_RAW

LZ4 compression.

Implementations

impl Compression

pub(crate) fn codec_to_string(self) -> String

Returns the codec type of this compression setting as a string, without the compression level.

Trait Implementations

impl Clone for Compression

fn clone(&self) -> Compression

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Compression

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Compression

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<Compression> for CompressionCodec

fn from(value: Compression) -> Self

Converts to this type from the input type.

impl FromStr for Compression

type Err = ParquetError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl HeapSize for Compression

fn heap_size(&self) -> usize

Return the size of any bytes allocated on the heap by this object, including heap memory in those structures

impl PartialEq for Compression

fn eq(&self, other: &Compression) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TryFrom<CompressionCodec> for Compression

type Error = ParquetError

The type returned in the event of a conversion error.

fn try_from(value: CompressionCodec) -> Result<Self>

Performs the conversion.

impl Copy for Compression

impl Eq for Compression

impl StructuralPartialEq for Compression