import { ConditionExpression } from './ConditionExpression';
export declare type SelectExpression = {
    type: 'Select';
    fromDatasetColumn: string;
    selectRow: string | ConditionExpression;
    distinctOnly: 'TRUE' | 'FALSE';
};
export declare type FilterExpression = {
    type: 'Filter';
    dataset: string;
    selectRow: string | ConditionExpression;
};
export declare type OrderByExpression = {
    type: 'OrderBy';
    keys: string;
    orderBy: Array<[string, 'TRUE' | 'FALSE']>;
};
export declare type QueryExpression = SelectExpression | FilterExpression | OrderByExpression;
export declare function isQueryExpression(arg: any): arg is QueryExpression;
export declare function serializeQueryExpression(query: QueryExpression): string;
export declare function isQueryStringValid(input: string): boolean;