OptionalaggregatorAggregator function can be a custom implementation of PivotAggregation, or
use predefined ones from IgxPivotAggregate and its variants.
OptionalaggregatorAggregation name that will be used from a list of predefined aggregations. If not set will use the specified aggregator function.
Aggregation unique key.
Aggregation label to show in the UI.
Interface describing a IPivotAggregator class. Used for specifying custom aggregator lists.