import { PodColumnBase } from './schema';
export type AggregateFunction = 'count' | 'sum' | 'avg' | 'min' | 'max';
export interface AggregateExpression {
    kind: 'aggregate';
    func: AggregateFunction;
    column?: PodColumnBase | string;
    distinct?: boolean;
}
interface AggregateOptions {
    distinct?: boolean;
}
export declare function count(column?: PodColumnBase | string, options?: AggregateOptions): AggregateExpression;
export declare function sum(column: PodColumnBase | string, options?: AggregateOptions): AggregateExpression;
export declare function avg(column: PodColumnBase | string, options?: AggregateOptions): AggregateExpression;
export declare function min(column: PodColumnBase | string, options?: AggregateOptions): AggregateExpression;
export declare function max(column: PodColumnBase | string, options?: AggregateOptions): AggregateExpression;
export declare function isAggregateExpression(value: unknown): value is AggregateExpression;
export {};
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