{
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  "as_of": "2026-10-23",
  "item": {
    "id": "METHOD-0280",
    "kind": "METHOD",
    "title": "PyArrowで表をParquetへ保存して読み直す",
    "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": "処理結果を型付きの列指向ファイルへ渡す場面。",
    "unsuitable_for": "型の互換性を確認せず長期保存を保証する用途。",
    "purpose": "PyArrowで表をParquetへ保存して読み直す",
    "composition": "PyArrow + Python",
    "shortest_path": [
      "列の型とNULLを含む検証表を作る",
      "Parquetへ出力し、別の読み取りで開く",
      "schema・行数と代表値を比較する"
    ],
    "verification": "保存前後の型・NULL・値を照合し、形式変換の損失を確認します。",
    "coverage": [
      "data transformation"
    ],
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    "index": "INDEX",
    "ads": "OFF",
    "link_policy": "DIRECT"
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