Ash.DataLayer.run_aggregate_query

You're seeing just the function run_aggregate_query, go back to Ash.DataLayer module for more information.
Link to this function

run_aggregate_query(query, aggregates, resource)

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Specs

run_aggregate_query(
  data_layer_query(),
  [Ash.Query.Aggregate.t()],
  Ash.Resource.t()
) :: {:ok, map()} | {:error, term()}