import { type SQL, type AnyColumn } from "drizzle-orm";
/**
 * TiDB aggregate helpers that are not provided by `drizzle-orm` aggregate exports.
 *
 * Do NOT duplicate `count`, `countDistinct`, `sum`, `sumDistinct`, `avg`, `avgDistinct`,
 * `min`, and `max` because those already exist in `drizzle-orm/sql/functions/aggregate`.
 *
 * JSON aggregates are implemented in `JsonTiDB` (`jsonArrayAgg`, `jsonObjectAgg`).
 */
export type AggregateSqlInput = SQL | AnyColumn | string | number | boolean;
/** `GROUP_CONCAT(expr)` or `GROUP_CONCAT(expr SEPARATOR sep)` */
export declare function groupConcat(expr: AggregateSqlInput, separator?: AggregateSqlInput): SQL;
/** `GROUP_CONCAT(DISTINCT expr)` or `... SEPARATOR sep` */
export declare function groupConcatDistinct(expr: AggregateSqlInput, separator?: AggregateSqlInput): SQL;
/** `VARIANCE(expr)` — alias of `VAR_POP` */
export declare function variance(expr: AggregateSqlInput): SQL;
/** `VAR_POP(expr)` */
export declare function varPop(expr: AggregateSqlInput): SQL;
/** `STD(expr)` — alias of `STDDEV_POP` */
export declare function std(expr: AggregateSqlInput): SQL;
/** `STDDEV(expr)` — alias of `STDDEV_POP` */
export declare function stddev(expr: AggregateSqlInput): SQL;
/** `STDDEV_POP(expr)` */
export declare function stddevPop(expr: AggregateSqlInput): SQL;
/** `VAR_SAMP(expr)` */
export declare function varSamp(expr: AggregateSqlInput): SQL;
/** `STDDEV_SAMP(expr)` */
export declare function stddevSamp(expr: AggregateSqlInput): SQL;
/** `APPROX_PERCENTILE(expr, percentage)` where percentage is in [1,100]. */
export declare function approxPercentile(expr: AggregateSqlInput, percentage: number): SQL;
/** `APPROX_COUNT_DISTINCT(expr [, expr ...])` */
export declare function approxCountDistinct(first: AggregateSqlInput, ...rest: AggregateSqlInput[]): SQL;
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