feat(layout): compile evals, row indices, and takes to pipelines

[joseph-isaacs]

Summary

• Tracking: do not merge(scan): V2 planning, local IO coalescing, and shared segment cache on top of #10339 #10349

Stacked on #10392. Implements the pipeline compile hooks for expressions, row indices, and dictionaries.

Changes

• Eval adds a stage that applies its expression to each batch of its child's chain.
• RowIdx emits the global index of every selected row as one batch.
• Take reads its values over their whole domain into an unbounded inlet, and wraps each batch of codes as a dictionary over them once they are whole.

Tests check that a take emits nothing before its values are whole, including when a predicate was pushed onto the values, and that an expression sees only the selected rows.

Checks run: cargo clippy -p vortex-layout --all-targets --all-features -- -D warnings, cargo test -p vortex-layout --lib, cargo +nightly-2026-09-10 fmt -p vortex-layout.

🤖 Generated with Claude Code

https://claude.ai/code/session_01NWYmfHTFtaEdhdyd3u5hv3

[codspeed]

Merging this PR will improve performance by 13.68%

⚠️ 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.

⚠️ 15 benchmarks spent significant time in system calls

System calls cannot be consistently instrumented, so they are not included in the measure, which understates the real cost. Please switch to the Walltime instrument to accurately measure system calls.

Measurement and system calls

• take[small_m/shuffled/primitive/nonnull/chunks=2048/indices=16]
• chunked_dict_primitive_into_canonical[f64, (1000, 1000, 10)]
• optimize_lookup_predicate[ids=256, shape=in_list]
• zstd_compress_string
• multipolygon_mixed_validity
• filter_run_end[len=4096_run=16_density=0.1]
• density_sweep_dense_runs[0.001]
• decompress[u32, (1000, 256)]
• take_varbin
• pcodec_compress_f64
• …and 5 more

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 2182 untouched benchmarks
⏩ 359 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	bitpack_blocked_compress_avx2	7.6 µs	6.7 µs	+13.68%

Tip

Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing ji/exec-4-eval-row-idx-take-nodes (40e14e8) with ji/exec-3-scan-concat-pack-nodes (a6f9c85)}

Footnotes

1. 359 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. ↩