/**
 * CostEstimator provides heuristic query cost estimation.
 * In production, this would integrate with database EXPLAIN plans.
 * For now, it uses SQL analysis heuristics.
 */
export interface CostEstimate {
    score: number;
    factors: CostFactor[];
    recommendation?: string;
}
export interface CostFactor {
    name: string;
    impact: number;
    description: string;
}
export declare class CostEstimator {
    private maxScore;
    constructor(maxScore?: number);
    /**
     * Estimate the cost of a SQL query using heuristic analysis.
     */
    estimate(sql: string): CostEstimate;
}
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