/** Packets sent by the client to the server. */
export declare enum ClientPacketType {
    Hello = 0,
    Query = 1,
    Data = 2,
    Cancel = 3,
    Ping = 4,
    TablesStatusRequest = 5,
    KeepAlive = 6
}
/** Packets sent by the server to the client. */
export declare enum ServerPacketType {
    Hello = 0,
    Data = 1,
    Exception = 2,
    Progress = 3,
    Pong = 4,
    EndOfStream = 5,
    ProfileInfo = 6,
    Totals = 7,
    Extremes = 8,
    TablesStatusResponse = 9,
    Log = 10,
    TableColumns = 11,
    PartUUIDs = 12,
    ReadTaskRequest = 13,
    ProfileEvents = 14,
    MergeTreeAllRangesAnnouncement = 15,
    MergeTreeReadTaskRequest = 16,
    TimezoneUpdate = 17
}
/** Compression methods used in the native protocol. */
export declare enum CompressionMethod {
    None = 2,
    LZ4 = 130,
    ZSTD = 144
}
/** Query processing stage. */
export declare enum QueryProcessingStage {
    FetchColumns = 0,
    WithMergeableState = 1,
    Complete = 2,
    WithMergeableStateAfterAggregation = 3,
    WithMergeableStateAfterAggregationAndLimit = 4
}
/** The minimum server revision we support. */
export declare const MIN_PROTOCOL_VERSION = 54423;
/** Current client protocol version we advertise.
 *  54453 supports: settings as strings with flags, interserver_secret,
 *  OpenTelemetry, distributed_depth, initial_query_start_time, parallel_replicas.
 *  Below 54456 to avoid client addendum / nonce exchange. */
export declare const PROTOCOL_VERSION = 54453;
export declare const CLIENT_NAME = "clickhouse-tcp";
export declare const CLIENT_VERSION_MAJOR = 24;
export declare const CLIENT_VERSION_MINOR = 1;
export declare const CLIENT_VERSION_PATCH = 0;