Execution rule for Chunked<ParquetVariant>

[AdamGS]

Summary

When we have Chunked array, we can (sometimes) keep it as a ParquetVariant array instead of just shifting the ChunkedArray into a canonical Variant array's core storage child.

[codspeed-hq]

Merging this PR will degrade performance by 16.59%

⚠️ 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 regressed benchmark
✅ 1236 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	chunked_varbinview_opt_canonical_into[(1000, 10)]	187.7 µs	225.1 µs	-16.59%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing adamg/chunked-parquet-variant (133ec1d) with develop (008c1d9)}

[robert3005]

@joseph-isaacs has done quite a bit of work on Chunked execution. Maybe we should do the swizzling in the builder execution mode?