framework
Fast, multi-threaded DataFrame library written in Rust with Python bindings, used for querying and transforming tabular data.
No evidence-backed relationships are recorded.
A week of measurements on one Mac mini puts the lru_cache wrapper around strptime at 3x when dates repeat and slightly slower when they do not. A Polars 2.0 release candidate finishes the same report in 0.13 s.
Reality
A cross-sectional reversal baseline on 15-minute Bybit perpetual bars won 67 of 76 out-of-sample windows before costs and none of them after. Charging the trading it requires puts breakeven near 2.5 bps per side.
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The AllRates dataset on Hugging Face holds 14.6 million rows in each publisher's own direction and label, so the collecting is finished while the inversion, rounding and missing-day rules stay in your code.
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The release candidate keeps collect's signature and changes what its default resolves to. Group_by, joins and unpivot can now return rows in a different order, and explain() still prints the plan that was not run.
Perspective Coverage
3 publishersReality
Ritchie Vink is selling 2.0 as a boring upgrade. Mostly it is, but engine="auto" now resolves to streaming by default, so joins and group_bys stop carrying incidental row order, and pipelines that leaned on it will drift quietly.
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A dev.to crash course splits pipeline testing into code correctness and data correctness. The split earns its keep because a renamed column produces nulls rather than a stack trace, so nothing pages anyone.
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Interlace drops templating from its dbt-style models. Its argument: parse the SQL, and the dependency graph you were asked to declare twice is already sitting in the FROM clause.
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