export declare class ClickHouseSchemaValidationError extends Error {
    constructor(message: string);
}
export declare const clickhouseSchemaService: {
    /**
     * Runs `ALTER TABLE ... ADD COLUMN IF NOT EXISTS ...` on ClickHouse.
     */
    addColumnIfNotExists(params: {
        tableName: string;
        columnName: string;
        columnType: string;
        afterColumn?: string;
    }): Promise<{
        sql: string;
    }>;
};
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