{
  "schema_version": "REFERENCE-1.0",
  "as_of": "2026-10-23",
  "item": {
    "id": "METHOD-0267",
    "kind": "METHOD",
    "title": "DuckDBでParquetの必要列だけを検索する",
    "last_verified": "2026-10-23",
    "currentness": "VERIFIED_AS_OF",
    "revision": 1,
    "requirements": [
      "対象ファイルへの権限",
      "型・文字コードの確認",
      "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": "大きなファイルから必要な部分をSQLで読む場面。",
    "unsuitable_for": "すべてのParquetをメモリーへ載せる前提の処理。",
    "purpose": "DuckDBでParquetの必要列だけを検索する",
    "composition": "DuckDB",
    "shortest_path": [
      "検証用Parquetと必要列を決める",
      "read_parquetをFROMにして列と条件を指定する",
      "schema・件数と代表値を照合する"
    ],
    "verification": "既知の小さな入力で列の型と抽出条件を確認します。",
    "coverage": [
      "database/SQL",
      "data transformation"
    ],
    "canonical_url": "https://enterprise-ai-dictionary.com/reference/methods/method-0267",
    "retrieval": "FULL",
    "publication": "PUBLIC_NO_ADS",
    "index": "INDEX",
    "ads": "OFF",
    "link_policy": "DIRECT"
  },
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      "object_id": "METHOD-0267",
      "scope_note": "公開一次資料に基づく利用経路。",
      "last_verified": "2026-10-23",
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      "predicate": "uses",
      "object_id": "TOOL-0012",
      "scope_note": "公開一次資料に基づく利用経路。",
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      "object_id": "IDX-C03-004",
      "scope_note": "検証・運用上の関連概念。製品の基本定義とは区別する。",
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      "object_id": "METHOD-0267",
      "scope_note": "利用結果の確認や運用上の注意点を読む経路。",
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}