{
  "key": "ACCUMULATOR",
  "nodeType": "PROCESSOR",
  "operatorType": "ACCUMULATOR",
  "metadata": {
    "groupFields": [],
    "aggregationFields": [
      {
        "field": null,
        "aggregation": "SUM",
        "targetField": null
      }
    ],
    "order":"ASC",
    "sortField": null
  },
  "label": "Accumulator",
  "hints": {
    "aggregationFields[].aggregation": "SUM | MIN | MAX | AVG | COUNT | DELTA",
    "order": "ASC | DESC"
  },
  "assumptions": [
    {
      "path": "aggregationFields[0].aggregation",
      "value": "SUM",
      "reason": "SUM is the most common accumulation function for usage totals.",
      "confidence": 0.85
    },
    {
      "path": "aggregationFields[0].targetField",
      "value": "totalQuantity",
      "reason": "Default output field name; defaults to source field name if omitted.",
      "confidence": 0.7
    }
  ],
  "blockers": [
    {
      "path": "groupFields",
      "message": "ACCUMULATOR groupFields is required. Which fields define the accumulation groups? (e.g. [\"accountNumber\"] or [\"accountNumber\", \"subscriptionNumber\"])"
    },
    {
      "path": "aggregationFields[0].field",
      "message": "ACCUMULATOR aggregation source field is required. Which event field should be accumulated?"
    }
  ]
}