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All-invalid compressor #6330

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Merged
gatesn merged 1 commit into from
Feb 6, 2026
Merged

All-invalid compressor #6330

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10 changes: 10 additions & 0 deletions vortex-btrblocks/src/compressor/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,11 @@
//! Compressor traits for type-specific compression.

use vortex_array::ArrayRef;
use vortex_array::IntoArray;
use vortex_array::arrays::ConstantArray;
use vortex_array::vtable::VTable;
use vortex_error::VortexResult;
use vortex_scalar::Scalar;

use crate::BtrBlocksCompressor;
use crate::CompressorContext;
Expand Down Expand Up @@ -138,6 +141,13 @@ where
return Ok(array.to_array());
}

// Avoid compressing all-null arrays.
if array.all_invalid()? {
return Ok(
ConstantArray::new(Scalar::null(array.dtype().clone()), array.len()).into_array(),
);
}

// Generate stats on the array directly.
let stats = self.gen_stats(array);
let best_scheme = self.choose_scheme(btr_blocks_compressor, &stats, ctx, excludes)?;
Expand Down
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