BufferIterator can be Send + Sync

[robert3005]

BufferIterator is Send and Sync just like Vec IntoIter, fix #8869

[github-actions]

Polar Signals Profiling Results

Latest Run

Status	Commit	Job	Attempt	Link
🟢 Done	fdaf786		1	Explore Profiling Data

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[github-actions]

Benchmarks: Vortex queries 📖

Verdict: No clear signal (low confidence)
Attributed Vortex impact: +5.2%
Engines: DataFusion No clear signal (+7.3%, low confidence) · DuckDB No clear signal (+3.2%, low confidence)
Vortex (geomean): 1.008x ➖
Parquet (geomean): 0.983x ➖
Shifts: Parquet (control) -1.7% · Median polish +1.1%

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 (1.041x ➖, 0↑ 0↓)

name	PR fdaf786 (ns)	base 39f4abe (ns)	ratio (PR/base)
vortex_q00/datafusion:vortex-file-compressed	9786474	9523459	1.03
vortex_q01/datafusion:vortex-file-compressed	6324871	5998335	1.05

datafusion / parquet (0.970x ➖, 0↑ 0↓)

name	PR fdaf786 (ns)	base 39f4abe (ns)	ratio (PR/base)
vortex_q00/datafusion:parquet	20218238	20757506	0.97
vortex_q01/datafusion:parquet	4532087	4691686	0.97

duckdb / vortex-file-compressed (1.027x ➖, 0↑ 0↓)

name	PR fdaf786 (ns)	base 39f4abe (ns)	ratio (PR/base)
vortex_q00/duckdb:vortex-file-compressed	10103765	10315691	0.98
vortex_q01/duckdb:vortex-file-compressed	6742507	6256783	1.08

duckdb / parquet (0.996x ➖, 0↑ 0↓)

name	PR fdaf786 (ns)	base 39f4abe (ns)	ratio (PR/base)
vortex_q00/duckdb:parquet	23436087	23377171	1.00
vortex_q01/duckdb:parquet	9421921	9525013	0.99

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