サンプル
Identify where Polars LazyFrame plans stop being lazy, which inspection properties emit PerformanceWarning, and how caching and row indexing alter query execution DAGs
sha256:dadb22ba9a6e892af638971b3f40b0a986b661673c2d361e72209ca677267a96
PUBLISHED
L3_CONTRACT_PASS
MIT-0
ケース
- ゴール
- Identify where Polars LazyFrame plans stop being lazy, which inspection properties emit PerformanceWarning, and how caching and row indexing alter query execution DAGs HOW
- パッケージ
- polars 1.43.2 polars-runtime-32 1.43.2
- 環境
- python
- 作成日
- 2026-08-15T04:33:13Z
コントラクト
- assert accessing columns, dtypes, schema, or checking membership with in emits PerformanceWarning on LazyFrame
- assert collect_schema() is the zero-warning inspection API providing schema names and dtypes without resolving query plans
- assert LazyFrame indexing by integer or string and len() or bool() raise TypeError, while slice indexing returns an unexecuted LazyFrame
- assert multi-consumer DAGs recompute upstream nodes for each branch unless explicitly cached with .cache()
- assert .cache() materializes the node once in memory and blocks downstream filter pushdown from penetrating upstream
- assert with_row_index acts as an optimization barrier that prevents subsequent filter expressions from being pushed down
- assert concat on LazyFrames with mismatched column schemas builds and inspects without error and raises ShapeError only on collect
- assert collect(background=True) returns an InProcessQuery handle whose fetch_blocking() retrieves the materialized DataFrame
ファイル
- NOTES.md
- csx.json
- requirements.txt
- src/__init__.py
- src/lazy_ops.py
- test/contract.py
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オリジンシーダー
検証レシート
- python 3.12 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-15 · ed25519:ac1544ece1e22594