export declare class AggregateFunction {
    static sum(): Sum;
    static avg(): Avg;
    static count(): Count;
    static distinct(): Distinct;
    static min(): Min;
    static max(): Max;
    static last(): LastValue;
}
declare class Sum {
    result: number;
    empty: boolean;
    invalid?: boolean;
    process(value: number): void;
    getResult(): number | null;
}
declare class Avg {
    result: number;
    count: number;
    empty: boolean;
    invalid?: boolean;
    process(value: number, count?: number): void;
    getResult(): number | null;
}
declare class Count {
    result: number;
    process(value: any): void;
    getResult(): number;
}
declare class Distinct {
    values: {
        [key: string]: boolean;
    };
    empty: boolean;
    result: number;
    invalid?: boolean;
    constructor();
    process(value: any): void;
    getResult(): number | null;
}
declare class Max {
    result: number;
    empty: boolean;
    invalid?: boolean;
    process(value: number): void;
    getResult(): number | null;
}
declare class Min {
    result: number;
    empty: boolean;
    invalid?: boolean;
    process(value: number): void;
    getResult(): number | null;
}
declare class LastValue {
    result: any;
    process(value: any): void;
    getResult(): any;
}
export {};
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