import { MemoryResource } from '@rapidsai/rmm';
import * as CUDF from '../addon';
import { Column } from '../column';
import { DataFrame } from '../data_frame';
import { GroupByBaseProps } from '../groupby';
import { List } from '../types/dtypes';
import { TypeMap } from '../types/mappings';
export declare type Groups<KeysMap extends TypeMap, ValuesMap extends TypeMap> = {
    keys: DataFrame<KeysMap>;
    offsets: Int32Array;
    values?: DataFrame<ValuesMap>;
};
export declare class GroupByBase<T extends TypeMap, R extends keyof T> {
    protected _by: R[];
    protected _values: DataFrame<Omit<T, R>>;
    protected _cudf_groupby: InstanceType<typeof CUDF.GroupBy>;
    constructor(props: GroupByBaseProps, by: R[], obj: DataFrame<T>);
    /**
     * Return the Groups for this GroupBy
     *
     * @param memoryResource The optional MemoryResource used to allocate the result's
     *   device memory.
     */
    getGroups(memoryResource?: MemoryResource): Groups<Pick<T, R>, Omit<T, R>>;
    protected _propagateListFieldNames(name: string & keyof Omit<T, R>, col: Column<List>): Column<List<any>>;
}
//# sourceMappingURL=base.d.ts.map