{
  "schema": 1,
  "sqlstate": "42P18",
  "condition_name": "indeterminate_datatype",
  "sources": [
    {
      "id": "src.errcodes.42P18.18.6",
      "kind": "upstream_source",
      "source_role": "condition_definition",
      "tag": "REL_18_6",
      "commit": "724edf9bde9d356724ad384a2e196edc3c9f80f7",
      "path": "src/backend/utils/errcodes.txt",
      "location": "line 351",
      "sha256": "6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba",
      "url": "https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L351"
    },
    {
      "id": "src.call.42P18.24454306029f6c5a510a8800",
      "kind": "upstream_source",
      "source_role": "source_call",
      "tag": "REL_18_6",
      "commit": "724edf9bde9d356724ad384a2e196edc3c9f80f7",
      "path": "src/backend/parser/parse_expr.c",
      "location": "lines 2102-2107",
      "sha256": "63c37770872a08978f931c31f801666a08e3bc8e51c2c65ff60151a1d139d55b",
      "url": "https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/parser/parse_expr.c#L2102-L2107"
    },
    {
      "id": "src.call.42P18.8fe85a04bb8a03d1fe617f46",
      "kind": "upstream_source",
      "source_role": "source_call",
      "tag": "REL_18_6",
      "commit": "724edf9bde9d356724ad384a2e196edc3c9f80f7",
      "path": "src/backend/tcop/postgres.c",
      "location": "lines 733-736",
      "sha256": "9fb62275b1badf94d01ab351337b60410cd9b3ab1fe63fa9f23d6d2185a21061",
      "url": "https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/tcop/postgres.c#L733-L736"
    },
    {
      "id": "src.calls.REL_18_6.42P18",
      "kind": "local_artifact",
      "source_role": "source_call_scan",
      "sha256": "9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf"
    }
  ],
  "claims": [
    {
      "id": "identity.class-and-condition",
      "statement": "42P18 is the indeterminate_datatype 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.42P18.18.6"
      ]
    },
    {
      "id": "mechanism.selected-source-path",
      "statement": "Core 18.6 reports empty ARRAY[] and, in pg_analyze_and_rewrite_varparams, rejects every parameter left InvalidOid or UNKNOWNOID after parse analysis, such as $1 with no constraining context. This is distinct from 42P08 conflicting deductions and 42P02 missing parameter references.",
      "method": "Read selected resolved REL_18_6 report groups and message roles.",
      "limits": "Representative confirmed core paths only; not exhaustive historical or extension coverage.",
      "sources": [
        "src.call.42P18.24454306029f6c5a510a8800",
        "src.call.42P18.8fe85a04bb8a03d1fe617f46"
      ]
    },
    {
      "id": "versions.catalogue-boundary",
      "statement": "Locked catalogue snapshots show this condition by PostgreSQL 7.4; source behavior here is fixed at PostgreSQL 18.6.",
      "method": "Read locked catalogue facts and definition snapshot.",
      "limits": "First observed release is a lower bound, not precise behavioral introduction.",
      "sources": [
        "src.errcodes.42P18.18.6"
      ]
    }
  ],
  "messages": [
    {
      "id": "message.variant-1",
      "sqlstate": "42P18",
      "severity_source": "ERROR",
      "primary_template": "cannot determine type of empty array",
      "detail_templates": [],
      "hint_templates": [
        "Explicitly cast to the desired type, for example ARRAY[]::integer[]."
      ],
      "roles": [
        {
          "role": "errmsg",
          "template": "cannot determine type of empty array"
        },
        {
          "role": "errhint",
          "template": "Explicitly cast to the desired type, for example ARRAY[]::integer[]."
        }
      ],
      "sources": [
        "src.call.42P18.24454306029f6c5a510a8800"
      ],
      "limits": "Placeholders remain dynamic source fields; no concrete runtime value is claimed."
    },
    {
      "id": "message.variant-2",
      "sqlstate": "42P18",
      "severity_source": "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.42P18.8fe85a04bb8a03d1fe617f46"
      ],
      "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.42P18.18.6"
      ]
    },
    {
      "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": []
}