Sort is not working for stats query

Sort is not working for stats query.Following query is returning same result for sort is 1 or 2.

{"table":"StatTable.SandeshMessageStat.msg_info","start_time":1474024800000000,"end_time":1474032000000000,"select_fields":["SUM(msg_info.messages)","msg_info.type"],"filter":[[]],"where":[[{"name":"name","value":"","op":7}]],"sort_fields":["SUM(msg_info.messages)"],"sort":1}.

Result

{
  "value": [
    {
      "msg_info.type": "LinkOper",
      "SUM(msg_info.messages)": 1
    },
    {
      "msg_info.type": "AlarmTrace",
      "SUM(msg_info.messages)": 1
    },
    {
      "msg_info.type": "ContrailConfigTrace",
      "SUM(msg_info.messages)": 1
    },
    {
      "msg_info.type": "VncApiConfigLog",
      "SUM(msg_info.messages)": 2
    },
    {
      "msg_info.type": "SvcMonitorLog",
      "SUM(msg_info.messages)": 2
    },
    {
      "msg_info.type": "IFMapServerConnection",
      "SUM(msg_info.messages)": 4
    },
    {
      "msg_info.type": "IFMapNodeOperation",
      "SUM(msg_info.messages)": 4
    },
    {
      "msg_info.type": "IFMapChannelProcResp",
      "SUM(msg_info.messages)": 4
    },
    {
      "msg_info.type": "QueryPerfInfo",
      "SUM(msg_info.messages)": 8
    },
    {
      "msg_info.type": "QEQueryLog",
      "SUM(msg_info.messages)": 24
    },
    {
      "msg_info.type": "QELog",
      "SUM(msg_info.messages)": 105
    },
    {
      "msg_info.type": "AlarmgenStatusTrace",
      "SUM(msg_info.messages)": 120
    },
    {
      "msg_info.type": "XMPPPeerInfo",
      "SUM(msg_info.messages)": 120
    },
    {
      "msg_info.type": "BGPRouterInfo",
      "SUM(msg_info.messages)": 120
    },
    {
      "msg_info.type": "ControlCpuStateTrace",
      "SUM(msg_info.messages)": 120
    },
    {
      "msg_info.type": "CassandraStatusUVE",
      "SUM(msg_info.messages)": 120
    },
    {
      "msg_info.type": "DatabaseUsage",
      "SUM(msg_info.messages)": 120
    },
    {
      "msg_info.type": "ComputeCpuStateTrace",
      "SUM(msg_info.messages)": 120
    },
    {
      "msg_info.type": "PeerStatsUve",
      "SUM(msg_info.messages)": 120
    },
    {
      "msg_info.type": "CollectorInfo",
      "SUM(msg_info.messages)": 121
    },
    {
      "msg_info.type": "CollectorDbStatsTrace",
      "SUM(msg_info.messages)": 132
    },
    {
      "msg_info.type": "VirtualMachineStatsTrace",
      "SUM(msg_info.messages)": 240
    },
    {
      "msg_info.type": "UveVirtualMachineAgentTrace",
      "SUM(msg_info.messages)": 240
    },
    {
      "msg_info.type": "VrouterStats",
      "SUM(msg_info.messages)": 360
    },
    {
      "msg_info.type": "ConfigCpuStateTrace",
      "SUM(msg_info.messages)": 360
    },
    {
      "msg_info.type": "VncApiStatsLog",
      "SUM(msg_info.messages)": 416
    },
    {
      "msg_info.type": "UveVMInterfaceAgentTrace",
      "SUM(msg_info.messages)": 480
    },
    {
      "msg_info.type": "UveVirtualNetworkAgentTrace",
      "SUM(msg_info.messages)": 480
    },
    {
      "msg_info.type": "AnalyticsCpuStateTrace",
      "SUM(msg_info.messages)": 481
    },
    {
      "msg_info.type": "ModuleCpuStateTrace",
      "SUM(msg_info.messages)": 841
    },
    {
      "msg_info.type": "IFMapDSResp",
      "SUM(msg_info.messages)": 885
    },
    {
      "msg_info.type": "NodeStatusUVE",
      "SUM(msg_info.messages)": 2036
    },
    {
      "msg_info.type": "VncApiError",
      "SUM(msg_info.messages)": 2125
    },
    {
      "msg_info.type": "SandeshModuleServerTrace",
      "SUM(msg_info.messages)": 2280
    },
    {
      "msg_info.type": "SandeshMessageStat",
      "SUM(msg_info.messages)": 2280
    },
    {
      "msg_info.type": "SandeshModuleClientTrace",
      "SUM(msg_info.messages)": 4195
    },
    {
      "msg_info.type": "discClientLog",
      "SUM(msg_info.messages)": 4738
    },
    {
      "msg_info.type": "AlarmgenUpdate",
      "SUM(msg_info.messages)": 4800
    },
    {
      "msg_info.type": "discServiceLog",
      "SUM(msg_info.messages)": 21555
    },
    {
      "msg_info.type": "AnalyticsApiStats",
      "SUM(msg_info.messages)": 98008
    }
  ]
}