[
  {
    "id": "$concat baseline",
    "operator": "$concat",
    "kind": "baseline",
    "operand": "all",
    "expression": {
      "$concat": [
        "a",
        "b"
      ]
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": \"ab\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"ab\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[0]: null",
    "operator": "$concat",
    "kind": "null",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": null
    },
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": null}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[0]: missing",
    "operator": "$concat",
    "kind": "missing",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": null}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[0]: zero",
    "operator": "$concat",
    "kind": "zero",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": 0
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not int",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: negative",
    "operator": "$concat",
    "kind": "negative",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": -2
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not int",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: decimal",
    "operator": "$concat",
    "kind": "decimal",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": 2.5
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not double",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: numeric string",
    "operator": "$concat",
    "kind": "numeric string",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": "12"
    },
    "srotax": {
      "bson": "{\"v\": \"12b\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"12b\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[0]: text",
    "operator": "$concat",
    "kind": "text",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": "hello"
    },
    "srotax": {
      "bson": "{\"v\": \"hellob\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"hellob\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[0]: empty string",
    "operator": "$concat",
    "kind": "empty string",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": ""
    },
    "srotax": {
      "bson": "{\"v\": \"b\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"b\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[0]: boolean",
    "operator": "$concat",
    "kind": "boolean",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": true
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not bool",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: false",
    "operator": "$concat",
    "kind": "false",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": false
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not bool",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: typed date",
    "operator": "$concat",
    "kind": "typed date",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": {
        "$date": "2026-01-15T15:00:00Z"
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not date",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: decimal128",
    "operator": "$concat",
    "kind": "decimal128",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": {
        "$numberDecimal": "1.25"
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not decimal",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: empty array",
    "operator": "$concat",
    "kind": "empty array",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": []
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not array",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: numeric array",
    "operator": "$concat",
    "kind": "numeric array",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": [
        1,
        2,
        3
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not array",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: mixed array",
    "operator": "$concat",
    "kind": "mixed array",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": [
        1,
        null,
        "x",
        3
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not array",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: nested array",
    "operator": "$concat",
    "kind": "nested array",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": [
        [
          1,
          2
        ],
        [
          3
        ]
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not array",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: empty object",
    "operator": "$concat",
    "kind": "empty object",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": {}
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not object",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: object",
    "operator": "$concat",
    "kind": "object",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": {
        "x": 1
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not object",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[0]: ISO date string",
    "operator": "$concat",
    "kind": "ISO date string",
    "operand": "text[0]",
    "expression": {
      "$concat": [
        "$probe",
        "b"
      ]
    },
    "input": {
      "probe": "2026-01-15T15:00:00Z"
    },
    "srotax": {
      "bson": "{\"v\": \"2026-01-15T15:00:00Zb\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"2026-01-15T15:00:00Zb\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[1]: null",
    "operator": "$concat",
    "kind": "null",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": null
    },
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": null}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[1]: missing",
    "operator": "$concat",
    "kind": "missing",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": null}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[1]: zero",
    "operator": "$concat",
    "kind": "zero",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": 0
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not int",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: negative",
    "operator": "$concat",
    "kind": "negative",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": -2
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not int",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: decimal",
    "operator": "$concat",
    "kind": "decimal",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": 2.5
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not double",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: numeric string",
    "operator": "$concat",
    "kind": "numeric string",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": "12"
    },
    "srotax": {
      "bson": "{\"v\": \"a12\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"a12\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[1]: text",
    "operator": "$concat",
    "kind": "text",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": "hello"
    },
    "srotax": {
      "bson": "{\"v\": \"ahello\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"ahello\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[1]: empty string",
    "operator": "$concat",
    "kind": "empty string",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": ""
    },
    "srotax": {
      "bson": "{\"v\": \"a\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"a\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat text[1]: boolean",
    "operator": "$concat",
    "kind": "boolean",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": true
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not bool",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: false",
    "operator": "$concat",
    "kind": "false",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": false
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not bool",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: typed date",
    "operator": "$concat",
    "kind": "typed date",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": {
        "$date": "2026-01-15T15:00:00Z"
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not date",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: decimal128",
    "operator": "$concat",
    "kind": "decimal128",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": {
        "$numberDecimal": "1.25"
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not decimal",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: empty array",
    "operator": "$concat",
    "kind": "empty array",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": []
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not array",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: numeric array",
    "operator": "$concat",
    "kind": "numeric array",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": [
        1,
        2,
        3
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not array",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: mixed array",
    "operator": "$concat",
    "kind": "mixed array",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": [
        1,
        null,
        "x",
        3
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not array",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: nested array",
    "operator": "$concat",
    "kind": "nested array",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": [
        [
          1,
          2
        ],
        [
          3
        ]
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not array",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: empty object",
    "operator": "$concat",
    "kind": "empty object",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": {}
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not object",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: object",
    "operator": "$concat",
    "kind": "object",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": {
        "x": 1
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat supports only string operands"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: $concat only supports strings, not object",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$concat text[1]: ISO date string",
    "operator": "$concat",
    "kind": "ISO date string",
    "operand": "text[1]",
    "expression": {
      "$concat": [
        "a",
        "$probe"
      ]
    },
    "input": {
      "probe": "2026-01-15T15:00:00Z"
    },
    "srotax": {
      "bson": "{\"v\": \"a2026-01-15T15:00:00Z\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"a2026-01-15T15:00:00Z\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat empty arguments",
    "operator": "$concat",
    "kind": "empty arguments",
    "operand": "all",
    "expression": {
      "$concat": []
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": \"\"}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": \"\"}",
      "present": true
    },
    "status": "EXACT_MATCH"
  },
  {
    "id": "$concat unknown option",
    "operator": "$concat",
    "kind": "unknown option",
    "operand": "all",
    "expression": {
      "$concat": {
        "unexpected": 1
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$concat expects an array of expressions"
    },
    "mongo": {
      "message": "Failed to optimize pipeline :: caused by :: $concat only supports strings, not object",
      "code": 16702,
      "error": "Location16702"
    },
    "status": "BOTH_REJECTED"
  }
]