Specialize VarBin PiecewiseSequence takes

[danking]

Summary

• move VarBin and VarBinView PiecewiseSequence take specializations out of Use PiecewiseSequence indices for FSL take #8800 into this stacked PR
• keep the branch based directly on codex/piecewise-sequential-take
• preserve existing behavior: VarBin copies contiguous byte ranges, VarBinView gathers view ranges while reusing backing data buffers

Validation

• cargo +nightly fmt --all
• cargo check -p vortex-array

[codspeed-hq]

Merging this PR will degrade performance by 20.51%

❌ 2 regressed benchmarks
✅ 1796 untouched benchmarks
⏩ 52 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	copy_nullable[65536]	1 ms	1.4 ms	-24.26%
❌	Simulation	copy_non_nullable[65536]	908.9 µs	1,089.5 µs	-16.57%

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 codex/piecewise-sequence-varbin-take (79d9e10) with codex/piecewise-sequential-take (6ee68b3)}

Footnotes

1. 52 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. ↩