vortex_btrblocks/schemes/float/
pco.rs

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: Copyright the Vortex contributors
3
4//! Pco (pcodec) float compression.
5
6use vortex_array::ArrayId;
7use vortex_array::ArrayRef;
8use vortex_array::Canonical;
9use vortex_array::ExecutionCtx;
10use vortex_array::IntoArray;
11use vortex_array::VTable;
12use vortex_compressor::scheme::CompressionEstimate;
13use vortex_compressor::scheme::DeferredEstimate;
14use vortex_error::VortexResult;
15
16use crate::ArrayAndStats;
17use crate::CascadingCompressor;
18use crate::CompressorContext;
19use crate::Scheme;
20
21/// Pco (pcodec) compression for floats.
22#[derive(Debug, Copy, Clone, PartialEq, Eq)]
23pub struct PcoScheme;
24
25impl Scheme for PcoScheme {
26    fn scheme_name(&self) -> &'static str {
27        "vortex.float.pco"
28    }
29
30    fn matches(&self, canonical: &Canonical) -> bool {
31        canonical.dtype().is_float()
32    }
33
34    fn produced_encodings(&self) -> Vec<ArrayId> {
35        vec![vortex_pco::Pco.id()]
36    }
37
38    fn expected_compression_ratio(
39        &self,
40        _data: &ArrayAndStats,
41        _compress_ctx: CompressorContext,
42        _exec_ctx: &mut ExecutionCtx,
43    ) -> CompressionEstimate {
44        CompressionEstimate::Deferred(DeferredEstimate::Sample)
45    }
46
47    fn compress(
48        &self,
49        _compressor: &CascadingCompressor,
50        data: &ArrayAndStats,
51        _compress_ctx: CompressorContext,
52        exec_ctx: &mut ExecutionCtx,
53    ) -> VortexResult<ArrayRef> {
54        Ok(vortex_pco::Pco::from_primitive(
55            data.array_as_primitive(),
56            pco::DEFAULT_COMPRESSION_LEVEL,
57            8192,
58            exec_ctx,
59        )?
60        .into_array())
61    }
62}
vortex_btrblocks/schemes/float/pco.rs

vortex_btrblocks/schemes/float/
pco.rs
