import type { MeasureDefinition, MeasureOptions } from './types.js';
export declare function validatePercentileLevel(level: number): void;
declare function createPercentileMeasure(field: string, level: number, opts?: MeasureOptions): MeasureDefinition;
export declare const measure: {
    readonly sum: (field: string, opts?: MeasureOptions) => MeasureDefinition;
    readonly count: (field: string, opts?: MeasureOptions) => MeasureDefinition;
    readonly countDistinct: (field: string, opts?: MeasureOptions) => MeasureDefinition;
    readonly avg: (field: string, opts?: MeasureOptions) => MeasureDefinition;
    readonly min: (field: string, opts?: MeasureOptions) => MeasureDefinition;
    readonly max: (field: string, opts?: MeasureOptions) => MeasureDefinition;
    /** Approximate percentile of a numeric field (ClickHouse `quantile(level)`). */
    readonly percentile: typeof createPercentileMeasure;
    /** Median — sugar for `percentile(field, 0.5)`. */
    readonly median: (field: string, opts?: MeasureOptions) => MeasureDefinition;
    /**
     * Value of `field` on the row where `by` is greatest (ClickHouse `argMax`).
     * The runtime value follows `field`'s type; aggregate result columns are
     * exposed as strings to match the dataset result contract.
     * Measure filters are not supported on argMax/argMin.
     */
    readonly argMax: (field: string, by: string, opts?: Omit<MeasureOptions, "filters">) => MeasureDefinition;
    /** Value of `field` on the row where `by` is smallest (ClickHouse `argMin`). */
    readonly argMin: (field: string, by: string, opts?: Omit<MeasureOptions, "filters">) => MeasureDefinition;
    /** Sample standard deviation (ClickHouse `stddevSamp`). */
    readonly stddev: (field: string, opts?: MeasureOptions) => MeasureDefinition;
    /** Sample variance (ClickHouse `varSamp`). */
    readonly variance: (field: string, opts?: MeasureOptions) => MeasureDefinition;
};
export {};
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