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fix(python): translate Polars fill_null with expression fills - #10192

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robert3005 merged 2 commits into
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dk/polars-fill-null
Oct 9, 2026
Merged

robert3005 merged 2 commits into
developfrom
dk/polars-fill-null

test(python): cover Polars fill_null with a string literal

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CodSpeed / CodSpeed Performance Analysis failed Oct 9, 2026 in 0s

2 benchmarks regressed

⚠️ 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.

⚠️ 1 benchmark measured no execution time

Nothing ran under measurement, usually because the compiler removed the code under test. This result is not comparable, so it counts as unchanged.

Preventing compiler optimizations

⚠️ 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

⚡ 2 improved benchmarks
❌ 2 regressed benchmarks
✅ 2171 untouched benchmarks
🆕 2 new benchmarks
⏩ 409 skipped benchmarks1

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ Simulation sum_v2_i64 193.8 µs 224.7 µs -13.73%
❌ Simulation sum_i64 193.9 µs 224.6 µs -13.67%
⚡ Simulation decode_primitives[i64, (1000, 32)] 37.7 µs 24.6 µs +53.59%
⚡ Simulation random_i128[0.01] 8.1 µs 7.2 µs +12.68%
🆕 Simulation varbinview_fill_null_inlined N/A 276.4 µs N/A
🆕 Simulation varbinview_fill_null_outlined N/A 288.6 µs N/A
⚠️ Simulation bench_compare_primitive[(10000, 2)] < 1 ns < 1 ns N/A

Tip

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


Comparing dk/polars-fill-null (babf64d) with develop (53c7659)2

Open in CodSpeed

Footnotes

  1. 409 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 (30e84dc) during the generation of this report, so 53c7659 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩