import type { Where } from 'payload';
/**
 * Query parameters map for ClickHouse parameterized queries
 */
export type QueryParams = Record<string, boolean | null | number | string>;
/**
 * Result of building a parameterized query
 */
export interface ParameterizedQuery {
    params: QueryParams;
    sql: string;
}
/**
 * QueryBuilder creates parameterized SQL queries for ClickHouse
 * Uses {param:Type} syntax for safe parameter binding
 */
export declare class QueryBuilder {
    private paramCounter;
    private params;
    /**
     * Apply an operator to a field
     */
    private applyOperator;
    /**
     * Recursively build conditions from a where object
     */
    private buildConditions;
    /**
     * Build conditions for a single field with operators
     */
    private buildFieldConditions;
    /**
     * Get the ClickHouse field path for a Payload field
     */
    private getFieldPath;
    /**
     * Add a parameter for datetime comparison, converting ISO strings to DateTime64
     * for datetime columns (createdAt, updatedAt, deletedAt, v)
     */
    addDatetimeParam(field: string, value: unknown): string;
    /**
     * Add a named parameter (for reuse)
     */
    addNamedParam(name: string, value: unknown): string;
    /**
     * Add a parameter and return its placeholder
     */
    addParam(value: unknown, type?: 'Float64' | 'Int64' | 'String' | 'UInt8'): string;
    /**
     * Add a timestamp parameter (milliseconds since epoch)
     */
    addTimestamp(ms: number): string;
    /**
     * Build the base WHERE clause for collection queries
     */
    buildBaseWhere(ns: string, type: string): string;
    /**
     * Build base WHERE without deletedAt filter (for use inside subqueries)
     */
    buildBaseWhereNoDeleted(ns: string, type: string): string;
    /**
     * Build WHERE clause from Payload's where condition
     */
    buildWhereClause(where: undefined | Where): string;
    /**
     * Get all collected parameters
     */
    getParams(): QueryParams;
}
/**
 * Combine base WHERE with additional conditions
 */
export declare function combineWhere(baseWhere: string, additionalWhere: string): string;
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