aggregate abstract method
Calculates adapter-side aggregates over the full effective adapter result
set. The request uses filter/search criteria but never includes paging
limits. Adapters that do not support aggregates should expose
capabilities.aggregates == false; FdcDataAdapter provides a default
unsupported implementation for subclass-based adapters.
Implementation
Future<FdcDataAggregateResult> aggregate(FdcDataAggregateRequest request);