import { z } from 'zod';
import type { SampleValue } from './types.js';
export declare const GetSampleValuesSchema: z.ZodObject<{
    tableName: z.ZodString;
    columnNames: z.ZodOptional<z.ZodArray<z.ZodString, "many">>;
    sampleSize: z.ZodDefault<z.ZodOptional<z.ZodNumber>>;
}, "strip", z.ZodTypeAny, {
    tableName: string;
    sampleSize: number;
    columnNames?: string[] | undefined;
}, {
    tableName: string;
    columnNames?: string[] | undefined;
    sampleSize?: number | undefined;
}>;
export type GetSampleValuesInput = z.infer<typeof GetSampleValuesSchema>;
/**
 * Get sample values from table columns (with strict safety limits)
 *
 * This tool provides:
 * - Sample values for each column (default 3 rows max)
 * - Distinct count (approximate)
 * - Null count
 *
 * SAFETY: Enforces FETCH FIRST n ROWS ONLY (max 10) to prevent resource exhaustion.
 * Helps LLMs understand data patterns and formats.
 *
 * @param input - Table name, optional column filter, and sample size
 * @returns Sample values for columns
 */
export declare function getSampleValues(input: GetSampleValuesInput): Promise<{
    success: boolean;
    data?: SampleValue[];
    error?: string;
}>;
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