Remove unused ArrayRef::is_arrow

[connortsui20]

Summary

• remove the unused ArrayRef::is_arrow helper
• keep this reviewer-requested cleanup separate from Unify primitive and decimal physical storage #8864

Testing

• cargo check -p vortex-array
• cargo clippy --all-targets --all-features (pre-push hook)

[github-actions]

Polar Signals Profiling Results

Latest Run

Status	Commit	Job	Attempt	Link
🟢 Done	87fd36f		1	Explore Profiling Data

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[github-actions]

Benchmarks: Vortex queries 📖

Verdict: No clear signal (low confidence)
Attributed Vortex impact: +0.5%
Engines: DataFusion No clear signal (+8.1%, medium confidence) · DuckDB No clear signal (-6.5%, medium confidence)
Vortex (geomean): 0.922x ➖
Parquet (geomean): 0.919x ➖
Shifts: Parquet (control) -8.1% · Median polish -7.6%

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 (0.937x ➖, 0↑ 0↓)

name	PR 87fd36f (ns)	base 5b688a9 (ns)	ratio (PR/base)
vortex_q00/datafusion:vortex-file-compressed	9853745	10644295	0.93
vortex_q01/datafusion:vortex-file-compressed	6476957	6830634	0.95

datafusion / parquet (0.867x ✅, 2↑ 0↓)

name	PR 87fd36f (ns)	base 5b688a9 (ns)	ratio (PR/base)
vortex_q00/datafusion:parquet 🚀	20229346	22843824	0.89
vortex_q01/datafusion:parquet 🚀	4611270	5437392	0.85

duckdb / vortex-file-compressed (0.911x ➖, 1↑ 0↓)

name	PR 87fd36f (ns)	base 5b688a9 (ns)	ratio (PR/base)
vortex_q00/duckdb:vortex-file-compressed	10346485	10947785	0.95
vortex_q01/duckdb:vortex-file-compressed 🚀	6111407	6952563	0.88

duckdb / parquet (0.975x ➖, 0↑ 0↓)

name	PR 87fd36f (ns)	base 5b688a9 (ns)	ratio (PR/base)
vortex_q00/duckdb:parquet	23524138	24229204	0.97
vortex_q01/duckdb:parquet	9539607	9746132	0.98

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No file size changes detected.

[connortsui20]

Closing this because it was created in the wrong task context; the original stacked PR state has been restored.

[connortsui20]

oh codex decided to delete this for some reason

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.08%. Comparing base (2ea51cb) to head (87fd36f).
⚠️ Report is 2 commits behind head on develop.

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