Fix CUDA ListView dictionary export regression test

[onursatici]

Rationale for this change

The PiecewiseSequence ListView rebuild now preserves dictionary encoding for large lists. The cuda export regression test still expected the previous, incidentally canonicalised Int32 child layout

[github-actions]

Polar Signals Profiling Results

Latest Run

Status	Commit	Job	Attempt	Link
🟢 Done	46cb0d2		1	Explore Profiling Data

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Powered by Polar Signals Cloud

[github-actions]

Benchmarks: Vortex queries 📖

Verdict: No clear signal (low confidence)
Attributed Vortex impact: +0.1%
Engines: DataFusion No clear signal (+8.2%, medium confidence) · DuckDB No clear signal (-7.5%, medium confidence)
Vortex (geomean): 0.938x ➖
Parquet (geomean): 0.938x ➖
Shifts: Parquet (control) -6.2% · Median polish -6.1%

How to read Verdict and Engines

• Verdict: Overall PR-level signal after subtracting baseline drift estimated from Parquet control rows. It can be Likely improvement, Likely regression, or No clear signal.
• Engines: Per-engine attribution. DataFusion is compared against DataFusion/Parquet controls; DuckDB is compared against DuckDB/Parquet controls. This answers whether each engine improved or regressed independently.
• Confidence: Based on directional consistency, share of rows above the noise floor, and control-run noise.

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datafusion / vortex-file-compressed (0.974x ➖, 0↑ 0↓)

name	PR 46cb0d2 (ns)	base e767a30 (ns)	ratio (PR/base)
vortex_q00/datafusion:vortex-file-compressed	9449016	9825439	0.96
vortex_q01/datafusion:vortex-file-compressed	6292945	6382956	0.99

datafusion / parquet (0.900x ✅, 1↑ 0↓)

name	PR 46cb0d2 (ns)	base e767a30 (ns)	ratio (PR/base)
vortex_q00/datafusion:parquet	19291380	21147036	0.91
vortex_q01/datafusion:parquet 🚀	4513977	5088668	0.89

duckdb / vortex-file-compressed (0.905x ➖, 1↑ 0↓)

name	PR 46cb0d2 (ns)	base e767a30 (ns)	ratio (PR/base)
vortex_q00/duckdb:vortex-file-compressed	9994702	10812350	0.92
vortex_q01/duckdb:vortex-file-compressed 🚀	5715422	6455096	0.89

duckdb / parquet (0.978x ➖, 0↑ 0↓)

name	PR 46cb0d2 (ns)	base e767a30 (ns)	ratio (PR/base)
vortex_q00/duckdb:parquet	23199329	23704975	0.98
vortex_q01/duckdb:parquet	9348956	9561482	0.98

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No file size changes detected.

[codspeed-hq]

Merging this PR will improve performance by 18.4%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 1 improved benchmark
✅ 1838 untouched benchmarks
⏩ 3 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	cuda/bitpacked_u8/unpack/3bw[100M]	354.9 µs	299.8 µs	+18.4%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing os/test-fix (46cb0d2) with develop (c66add6)}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩