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    "kind": "METHOD",
    "title": "Polarsのlazy APIでファイルの抽出計画を確認する",
    "last_verified": "2026-10-23",
    "currentness": "VERIFIED_AS_OF",
    "revision": 1,
    "requirements": [
      "対象データへの権限",
      "接続先または入力ファイルを確認する",
      "原典と導入済みversionの対応を確認し、権限のある検証用入力・別の出力先を用意する"
    ],
    "suitable_for": "ファイルから必要なデータだけを遅延実行で取り出す場面。",
    "unsuitable_for": "計画を表示しただけで処理が完了したと扱う用途。",
    "purpose": "Polarsのlazy APIでファイルの抽出計画を確認する",
    "composition": "Polars + Python",
    "shortest_path": [
      "大きさとschemaが分かる検証ファイルを用意する",
      "scanからfilterとselectを組み、explainで計画を読む",
      "collectして件数と抽出値を照合する"
    ],
    "verification": "計画表示と実行結果を区別し、必要な列と条件が適用されたことを確認します。",
    "coverage": [
      "data transformation"
    ],
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