[robert3005]

Every split of a scan prunes with each filter conjunct, and each layout
reader on the way looks the conjunct up in a cache keyed by tree
identity. Each lookup cloned the expression into a key, hashed the
options of its function, such as literal lists, and dropped the key
again. An ExactKey trait lets these maps be probed with a borrowed expression,
the hash uses only the identity of the children, and the struct reader
lends its cached partitioning instead of cloning it.

[codspeed]

Merging this PR will degrade performance by 3.14%

4 warnings, 1 note

⚠️ Walltime results may be unreliable

Some benchmarks used the Walltime instrument outside CodSpeed Macro Runners, which can make the results inconsistent.

Learn more about Macro Runners

See affected benchmarks

⚠️ Unable to measure the execution of 2 benchmarks

These benchmarks measured no execution time, so their results are not comparable and count as unchanged. This usually happens when the compiler removes the code under test.

Prevent compiler optimizations

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⚠️ 22 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

⚠️ Base and head ran on different runner types

Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.

Learn more about Macro Runners

Open the report in CodSpeed to investigate

ℹ️ 40 benchmarks have no flamegraph

The flamegraph wasn't generated: the symbols of the profiling trace could not be resolved, because no information about the language frames was collected.

See affected benchmarks

⚡ 2 improved benchmarks
❌ 1 regressed benchmark
✅ 2436 untouched benchmarks
⏩ 12 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	CPU Simulation	chunked_dict_primitive_canonical_into[f64, (1000, 1000, 10)]	146.7 µs	201.5 µs	-27.18%
⚡	CPU Simulation	test_scan_filter[int]	3.4 ms	3 ms	+13.43%
⚡	Walltime	compare_u64_avx2	3.7 µs	3.3 µs	+10.03%

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 rk/exact-key-probes (1251b6b) with develop (a59294e)}

Footnotes

1. 12 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. ↩