Fix Arrow struct export

[gatesn]

And...

• Adds unary filter push-down rule
• Fixes ordering of filter + project in layout reader

[codspeed-hq]

CodSpeed Performance Report

Merging #5731 will degrade performances by 10.74%

_{Comparing ngates/fix-filter-rules (8bdedcc) with develop (afe1196)}

Summary

❌ 16 regressions
✅ 1240 untouched
⏩ 621 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	bench_dict_mask[(0.01, 0.1)]	1 ms	1.2 ms	-10.73%
❌	bench_dict_mask[(0.01, 0.01)]	1 ms	1.2 ms	-10.74%
❌	bench_dict_mask[(0.01, 0.9)]	1 ms	1.2 ms	-10.73%
❌	bench_dict_mask[(0.1, 0.01)]	1 ms	1.2 ms	-10.74%
❌	bench_dict_mask[(0.1, 0.5)]	1 ms	1.2 ms	-10.74%
❌	bench_dict_mask[(0.9, 0.01)]	1 ms	1.2 ms	-10.74%
❌	bench_dict_mask[(0.1, 0.1)]	1 ms	1.2 ms	-10.73%
❌	bench_dict_mask[(0.1, 0.9)]	1 ms	1.2 ms	-10.73%
❌	bench_dict_mask[(0.5, 0.1)]	1 ms	1.2 ms	-10.73%
❌	bench_dict_mask[(0.9, 0.9)]	1.1 ms	1.2 ms	-10.7%
❌	bench_dict_mask[(0.5, 0.9)]	1 ms	1.2 ms	-10.73%
❌	bench_dict_mask[(0.5, 0.01)]	1 ms	1.2 ms	-10.74%
❌	bench_dict_mask[(0.9, 0.5)]	1 ms	1.2 ms	-10.74%
❌	bench_dict_mask[(0.9, 0.1)]	1 ms	1.2 ms	-10.73%
❌	bench_dict_mask[(0.5, 0.5)]	1 ms	1.2 ms	-10.74%
❌	bench_dict_mask[(0.01, 0.5)]	1 ms	1.2 ms	-10.73%

Footnotes

1. 621 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. ↩

[codecov]

Codecov Report

❌ Patch coverage is 0% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.62%. Comparing base (1058e6d) to head (8bdedcc).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
vortex-array/src/arrays/scalar_fn/rules.rs	0.00%	30 Missing ⚠️
vortex-array/src/arrow/executor/struct_.rs	0.00%	7 Missing ⚠️
vortex-array/src/arrays/filter/array.rs	0.00%	1 Missing ⚠️
vortex-layout/src/layouts/flat/reader.rs	0.00%	1 Missing ⚠️

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