vortex_sampling_compressor/compressors/
sparse.rs

1use vortex_array::aliases::hash_set::HashSet;
2use vortex_array::{Array, Encoding, EncodingId, IntoArray};
3use vortex_error::VortexResult;
4use vortex_sparse::{SparseArray, SparseEncoding};
5
6use crate::compressors::{CompressedArray, CompressionTree, EncodingCompressor};
7use crate::{constants, SamplingCompressor};
8
9#[derive(Debug)]
10pub struct SparseCompressor;
11
12impl EncodingCompressor for SparseCompressor {
13    fn id(&self) -> &str {
14        SparseEncoding::ID.as_ref()
15    }
16
17    fn cost(&self) -> u8 {
18        constants::SPARSE_COST
19    }
20
21    fn can_compress(&self, array: &Array) -> Option<&dyn EncodingCompressor> {
22        array.is_encoding(SparseEncoding::ID).then_some(self)
23    }
24
25    fn compress<'a>(
26        &'a self,
27        array: &Array,
28        _: Option<CompressionTree<'a>>,
29        ctx: SamplingCompressor<'a>,
30    ) -> VortexResult<CompressedArray<'a>> {
31        let sparse_array = SparseArray::try_from(array.clone())?;
32        let compressed_patches = ctx
33            .auxiliary("patches")
34            .compress_patches(sparse_array.patches())?;
35        Ok(CompressedArray::compressed(
36            SparseArray::try_new_from_patches(
37                compressed_patches,
38                sparse_array.len(),
39                sparse_array.indices_offset(),
40                sparse_array.fill_scalar(),
41            )?
42            .into_array(),
43            Some(CompressionTree::new(self, vec![])),
44            array,
45        ))
46    }
47
48    fn used_encodings(&self) -> HashSet<EncodingId> {
49        HashSet::from([SparseEncoding::ID])
50    }
51}
vortex_sampling_compressor/compressors/sparse.rs

vortex_sampling_compressor/compressors/
sparse.rs
