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CascadingCompressor

vortex_compressor

Struct CascadingCompressor 

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pub struct CascadingCompressor { /* private fields */ }
Expand description

The main compressor type implementing cascading adaptive compression.

This compressor applies adaptive compression Schemes to arrays based on their data types and characteristics. It recursively compresses nested structures like structs and lists, and chooses optimal compression schemes for leaf types.

The compressor works by:

  1. Canonicalizing input arrays to a standard representation.
  2. Pre-filtering schemes by Scheme::matches and exclusion rules.
  3. Evaluating each matching scheme’s compression ratio on a sample.
  4. Compressing with the best scheme and verifying the result is smaller.

No scheme may appear twice in a cascade chain. The compressor enforces this automatically along with push/pull exclusion rules declared by each scheme.

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impl CascadingCompressor

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pub fn new(schemes: Vec<&'static dyn Scheme>) -> Self

Creates a new compressor with the given schemes.

Root-level exclusion rules (e.g. excluding Dict from list offsets) are built automatically.

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pub fn execution_ctx(&self) -> MutexGuard<'_, ExecutionCtx>

Returns a mutable borrow of the execution context.

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pub fn compress(&self, array: &ArrayRef) -> VortexResult<ArrayRef>

Compresses an array using cascading adaptive compression.

First canonicalizes and compacts the array, then applies optimal compression schemes.

§Errors

Returns an error if canonicalization or compression fails.

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pub fn compress_child( &self, child: &ArrayRef, parent_ctx: &CompressorContext, parent_id: SchemeId, child_index: usize, ) -> VortexResult<ArrayRef>

Compresses a child array produced by a cascading scheme.

If the cascade budget is exhausted, the canonical array is returned as-is. Otherwise, the child context is created by descending and recording the parent scheme + child index, and compression proceeds normally.

§Errors

Returns an error if compression fails.

Trait Implementations§

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impl Clone for CascadingCompressor

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fn clone(&self) -> CascadingCompressor

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for CascadingCompressor

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

Formats the value using the given formatter. Read more

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