{
  "schema": 1,
  "sqlstate": "42P08",
  "condition_name": "ambiguous_parameter",
  "sources": [
    {
      "id": "src.errcodes.42P08.18.6",
      "kind": "upstream_source",
      "source_role": "condition_definition",
      "tag": "REL_18_6",
      "commit": "724edf9bde9d356724ad384a2e196edc3c9f80f7",
      "path": "src/backend/utils/errcodes.txt",
      "location": "line 388",
      "sha256": "6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba",
      "url": "https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L388"
    },
    {
      "id": "src.call.42P08.c2cfa81ed9389a1bddf8ec41",
      "kind": "upstream_source",
      "source_role": "source_call",
      "tag": "REL_18_6",
      "commit": "724edf9bde9d356724ad384a2e196edc3c9f80f7",
      "path": "src/backend/parser/parse_param.c",
      "location": "lines 220-227",
      "sha256": "4aab2ecc770fcda619b26ac12beaf7e527542b56f55eb45879b72e92442e8a28",
      "url": "https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/parser/parse_param.c#L220-L227"
    },
    {
      "id": "src.call.42P08.18ba6576d169dfdf614df72d",
      "kind": "upstream_source",
      "source_role": "source_call",
      "tag": "REL_18_6",
      "commit": "724edf9bde9d356724ad384a2e196edc3c9f80f7",
      "path": "src/backend/parser/parse_param.c",
      "location": "lines 308-312",
      "sha256": "4aab2ecc770fcda619b26ac12beaf7e527542b56f55eb45879b72e92442e8a28",
      "url": "https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/parser/parse_param.c#L308-L312"
    },
    {
      "id": "src.call.42P08.unresolved-boundary",
      "kind": "upstream_source",
      "source_role": "source_call",
      "tag": "REL_18_6",
      "commit": "724edf9bde9d356724ad384a2e196edc3c9f80f7",
      "path": "src/backend/tcop/postgres.c",
      "location": "lines 725-736",
      "sha256": "9fb62275b1badf94d01ab351337b60410cd9b3ab1fe63fa9f23d6d2185a21061",
      "url": "https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/tcop/postgres.c#L725-L736"
    },
    {
      "id": "src.calls.REL_18_6.42P08",
      "kind": "local_artifact",
      "source_role": "source_call_scan",
      "sha256": "9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf"
    }
  ],
  "claims": [
    {
      "id": "identity.class-and-condition",
      "statement": "42P08 is the ambiguous_parameter condition in Class 42.",
      "method": "Read fixed REL_18_6 errcodes.txt and locked facts.",
      "limits": "Identity does not enumerate all source branches or client failures.",
      "sources": [
        "src.errcodes.42P08.18.6"
      ]
    },
    {
      "id": "mechanism.selected-source-path",
      "statement": "The selected 42P08 guards are conflicting inferred types, reporting `inconsistent types deduced for parameter $%d` with DETAIL `%s versus %s`, and a later parameter-resolution mismatch, reporting `could not determine data type of parameter $%d`; both are ERRORs. The same second primary is emitted with 42P18 by the separate var-parameter completion guard when a type remains unknown after analysis, while an out-of-range marker is 42P02.",
      "method": "Read complete resolved REL_18_6 report groups and message roles.",
      "limits": "Representative confirmed core paths only; not exhaustive historical or extension coverage.",
      "sources": [
        "src.call.42P08.c2cfa81ed9389a1bddf8ec41",
        "src.call.42P08.18ba6576d169dfdf614df72d",
        "src.call.42P08.unresolved-boundary"
      ]
    },
    {
      "id": "versions.catalogue-boundary",
      "statement": "From 7.4 through 18.6 and 19beta3; this catalogue range is not a precise introduction claim. The selected two 42P08 guards and nearby 42P18 boundary are fixed 18.6 source paths and no runtime parameter case was run.",
      "method": "Read locked catalogue facts and definition snapshots.",
      "limits": "First observed release is a lower bound, not precise behavioral introduction.",
      "sources": [
        "src.errcodes.42P08.18.6"
      ]
    }
  ],
  "messages": [
    {
      "id": "message.variant-1",
      "sqlstate": "42P08",
      "severity_source": "explicit ERROR",
      "primary_template": "inconsistent types deduced for parameter $%d",
      "detail_templates": [
        "%s versus %s"
      ],
      "hint_templates": [],
      "roles": [
        {
          "role": "errmsg",
          "template": "inconsistent types deduced for parameter $%d"
        },
        {
          "role": "errdetail",
          "template": "%s versus %s"
        }
      ],
      "sources": [
        "src.call.42P08.c2cfa81ed9389a1bddf8ec41"
      ],
      "limits": "Placeholders remain dynamic source fields; no concrete runtime value is claimed."
    },
    {
      "id": "message.variant-2",
      "sqlstate": "42P08",
      "severity_source": "explicit ERROR",
      "primary_template": "could not determine data type of parameter $%d",
      "detail_templates": [],
      "hint_templates": [],
      "roles": [
        {
          "role": "errmsg",
          "template": "could not determine data type of parameter $%d"
        }
      ],
      "sources": [
        "src.call.42P08.18ba6576d169dfdf614df72d"
      ],
      "limits": "Placeholders remain dynamic source fields; no concrete runtime value is claimed."
    }
  ],
  "usage_evidence": [
    {
      "scope": "SQLSTATE definition and release identity",
      "status": "definition_only",
      "evidence_ids": [
        "identity.class-and-condition",
        "src.errcodes.42P08.18.6"
      ]
    },
    {
      "scope": "Selected PostgreSQL 18.6 source emitters and message roles",
      "status": "source_path_confirmed",
      "evidence_ids": [
        "mechanism.selected-source-path"
      ]
    },
    {
      "scope": "Natural runtime execution for this batch",
      "status": "unknown",
      "evidence_ids": []
    }
  ],
  "runtime": []
}