Example 6: Group — GroupBy with Aggregations

A GroupBy carrying one or more AggregateBy entries, passed to Group<T>.

Payload

{
  "fields": ["Category.Name"],
  "aggregateBy": [
    { "field": null, "alias": "TotalCount", "aggregator": "Count" },
    { "field": "Price", "alias": "AvgPrice", "aggregator": "Average" },
    { "field": "Price", "alias": "MaxPrice", "aggregator": "Maximum" }
  ]
}

Every group field must end on a simple type, so the key is Category.Name rather than Category: grouping by the navigation itself throws GroupByFieldCannotBeComplexType. Each row names the key by the path with its dots removed — here CategoryName.

Related

• Group extension
• Aggregator enum
• GroupBy validation rules
• Summary example — same shape inside a full where → group → having pipeline.