[BUG] Handle DESC Table response properly

[penghuo]

What is the bug?

• Query

DESC my_glue.default.http_logs

• Error response

{
  "status": 503,
  "error": {
    "type": "JSONException",
    "reason": "There was internal problem at backend",
    "details": "JSONObject[\"comment\"] not found."
  }
}

    * result data

{
  "_index": ".query_execution_result",
  "_id": "Y9Ce-YoBCiYjElO8QaLY",
  "_score": 1,
  "_source": {
    "result": [
      "{'col_name':'@timestamp','data_type':'timestamp'}",
      "{'col_name':'clientip','data_type':'string'}",
      "{'col_name':'request','data_type':'string'}",
      "{'col_name':'status','data_type':'int'}",
      "{'col_name':'size','data_type':'int'}",
      "{'col_name':'year','data_type':'int'}",
      "{'col_name':'month','data_type':'int'}",
      "{'col_name':'day','data_type':'int'}",
      "{'col_name':'# Partition Information','data_type':'','comment':''}",
      "{'col_name':'# col_name','data_type':'data_type','comment':'comment'}",
      "{'col_name':'year','data_type':'int'}",
      "{'col_name':'month','data_type':'int'}",
      "{'col_name':'day','data_type':'int'}"
    ],
    "schema": [
      "{'column_name':'col_name','data_type':'string'}",
      "{'column_name':'data_type','data_type':'string'}",
      "{'column_name':'comment','data_type':'string'}"
    ]
  }
}

    * DESC 

+--------------------+---------+-------+
|            col_name|data_type|comment|
+--------------------+---------+-------+
|          @timestamp|timestamp|   null|
|            clientip|   string|   null|
|             request|   string|   null|
|              status|      int|   null|
|                size|      int|   null|
|                year|      int|   null|
|               month|      int|   null|
|                 day|      int|   null|
|# Partition Infor...|         |       |
|          # col_name|data_type|comment|
|                year|      int|   null|
|               month|      int|   null|
|                 day|      int|   null|
+--------------------+---------+-------+

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