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feat(array): builders skip child canonicalization and append nested values in bulk [builders-child-stack] - #9064

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feat(array): builders skip child canonicalization and append nested values in bulk [builders-child-stack]#9064
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claude/builders-bulk-loop-callers-9ze0t6

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CodSpeed HQ / CodSpeed Performance Analysis failed Aug 7, 2026

6 benchmarks regressed

⚡ 13 improved benchmarks
❌ 6 regressed benchmarks
✅ 1915 untouched benchmarks
⏩ 51 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ Simulation decode_varbin[(1000, 2)] 61.5 µs 78 µs -21.12%
❌ Simulation canonicalize_sparse_fixed_size_list[(512, 7, 4)] 555.9 µs 680.1 µs -18.26%
❌ Simulation slice_dict_tight_loop[10000] 717.2 µs 872.8 µs -17.83%
❌ Simulation search_index_in_range_chunked 5.4 ms 6.4 ms -16.04%
❌ Simulation search_index_above_max_chunked 4.7 ms 5.4 ms -12.15%
❌ Simulation compress_fsst[(1000, 64, 8)] 1 ms 1.2 ms -10.62%
⚡ Simulation extend_from_array_zctl[(1000, 64)] 2,185.5 µs 659.5 µs ×3.3
⚡ Simulation extend_from_array_zctl[(10000, 8)] 3.6 ms 1.3 ms ×2.9
⚡ Simulation canonicalize_sparse_list[(1024, 17, 8)] 937.9 µs 558.5 µs +67.94%
⚡ Simulation extend_from_array_non_zctl_overlapping[(10000, 8)] 2.1 ms 1.3 ms +61.47%
⚡ Simulation extend_from_array_zctl[(1000, 8)] 906.5 µs 655.6 µs +38.27%
⚡ Simulation canonicalize_sparse_fixed_size_list[(1024, 17, 8)] 798.6 µs 640.3 µs +24.72%
⚡ Simulation take[small_m/shuffled/primitive/nonnull/chunks=16384/indices=16] 1.3 ms 1.1 ms +12.83%
⚡ Simulation take[small_m/shuffled/primitive/nonnull/chunks=16384/indices=256] 3.7 ms 3.3 ms +11.92%
⚡ Simulation take[small_m/shuffled/primitive/nonnull/chunks=16384/indices=1000] 11.2 ms 10 ms +11.9%
⚡ Simulation extend_from_array_non_zctl_overlapping[(1000, 8)] 755 µs 674.9 µs +11.86%
⚡ Simulation extend_from_array_non_zctl_overlapping[(1000, 32)] 747.7 µs 669.5 µs +11.67%
⚡ Simulation take[small_m/shuffled/primitive/nonnull/chunks=1024/indices=256] 2.5 ms 2.2 ms +11.4%
⚡ Simulation take[small_m/shuffled/primitive/nonnull/chunks=1024/indices=1000] 6.5 ms 5.9 ms +10.99%

Tip

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

Comparing claude/builders-bulk-loop-callers-9ze0t6 (83dbd41) with develop (74a2b86)2

Open in CodSpeed

Footnotes

  1. 51 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. ↩

  2. No successful run was found on develop (ad5de22) during the generation of this report, so 74a2b86 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

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