{
  "schema_version": "REFERENCE-1.0",
  "as_of": "2026-10-23",
  "item": {
    "id": "METHOD-0278",
    "kind": "METHOD",
    "title": "Polarsで二つの表をキーに沿って結合する",
    "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": "列指向の処理で属性表を結合する場面。",
    "unsuitable_for": "行順だけを根拠に別の表を対応付ける用途。",
    "purpose": "Polarsで二つの表をキーに沿って結合する",
    "composition": "Polars + Python",
    "shortest_path": [
      "キーの型と期待する結合方向を確認する",
      "DataFrameのjoinで必要な列を対応付ける",
      "未一致キーと結果の行数を検査する"
    ],
    "verification": "重複キーと未一致キーを含む例で結合結果を照合します。",
    "coverage": [
      "data transformation"
    ],
    "canonical_url": "https://enterprise-ai-dictionary.com/reference/methods/method-0278",
    "retrieval": "FULL",
    "publication": "PUBLIC_NO_ADS",
    "index": "INDEX",
    "ads": "OFF",
    "link_policy": "DIRECT"
  },
  "relations": [
    {
      "id": "REFREL-7cf3d182a81721dd",
      "subject_id": "SRC-EVID-REF-0274",
      "predicate": "supports",
      "object_id": "METHOD-0278",
      "scope_note": "公開一次資料に基づく利用経路。",
      "last_verified": "2026-10-23",
      "source_ids": [
        "SRC-EVID-REF-0274"
      ]
    },
    {
      "id": "REFREL-99de471ae17847b8",
      "subject_id": "TOOL-0063",
      "predicate": "supports",
      "object_id": "METHOD-0278",
      "scope_note": "公開一次資料に基づく利用経路。",
      "last_verified": "2026-10-23",
      "source_ids": [
        "SRC-EVID-REF-0274"
      ]
    },
    {
      "id": "REFREL-a9632c952b933c14",
      "subject_id": "METHOD-0278",
      "predicate": "uses",
      "object_id": "TOOL-0063",
      "scope_note": "公開一次資料に基づく利用経路。",
      "last_verified": "2026-10-23",
      "source_ids": [
        "SRC-EVID-REF-0274"
      ]
    },
    {
      "id": "REFREL-576867b4743669cb",
      "subject_id": "METHOD-0278",
      "predicate": "uses",
      "object_id": "TOOL-0006",
      "scope_note": "公開一次資料に基づく利用経路。",
      "last_verified": "2026-10-23",
      "source_ids": [
        "SRC-EVID-REF-0274"
      ]
    },
    {
      "id": "REFREL-4efd9c309899ec9f",
      "subject_id": "METHOD-0278",
      "predicate": "requires",
      "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。",
      "last_verified": "2026-10-23",
      "source_ids": [
        "SRC-EVID-REF-0274"
      ]
    },
    {
      "id": "REFREL-8149e81c89be071d",
      "subject_id": "IDX-C03-004",
      "predicate": "explains",
      "object_id": "METHOD-0278",
      "scope_note": "利用結果の確認や運用上の注意点を読む経路。",
      "last_verified": "2026-10-23",
      "source_ids": [
        "SRC-EVID-REF-0274"
      ]
    }
  ]
}