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    "kind": "METHOD",
    "title": "PolarsでCSVの列を選んで集計する",
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    "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",
      "公式手順で対応libraryを導入し、入力schemaを確認します。"
    ],
    "suitable_for": "PolarsでCSVの列を選んで集計するという目的を、この利用経路で短く試したい場面。",
    "unsuitable_for": "別libraryとAPIやnullの扱いが同じだと思い込む用途。",
    "purpose": "PolarsでCSVの列を選んで集計する",
    "composition": "Polars + Python",
    "shortest_path": [
      "入力CSVと必要な列・型を確認する",
      "DataFrameまたはlazy経路で列選択と集計を定義する",
      "結果の件数と値を照合する"
    ],
    "verification": "型、null、集計対象の行が意図どおりかを確認します。",
    "coverage": [
      "database/SQL",
      "data transformation"
    ],
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