GroupDescriptor
The group descriptor used by the groupBy
method.
aggregates? Array<AggregateDescriptor>
The aggregates which are calculated during grouping.
compare? (a: any, b: any) => number
A custom function that defines the sort order of the group.
dir? "asc" | "desc"
The sort order of the group.
field string
The data item field by which the data will be grouped.