aggregateFor
internal fun <T, C, R> Aggregator<*, R>.aggregateFor(data: Grouped<T>, columns: ColumnsForAggregateSelector<T, C?>): DataFrame<T>
internal fun <T, C, R> Aggregator<*, R>.aggregateFor(data: PivotGroupBy<T>, separate: Boolean, columns: ColumnsForAggregateSelector<T, C?>): DataFrame<T>
internal fun <T, C, R> Aggregator<*, R>.aggregateFor(data: DataFrame<T>, columns: ColumnsForAggregateSelector<T, C?>): DataRow<T>
internal fun <T, C : Any, R> AggregateInternalDsl<T>.aggregateFor(columns: ColumnsForAggregateSelector<T, C?>, aggregator: Aggregator<C, R>)