Column name in table header doesn't use field alias

[dai-chen]

For query with field alias in SELECT, for example select account_number AS num from accounts, the result table header is still showing account_number rather than num.

[dai-chen]

Since we use default format in SQL Kibana now, I guess this is due to our UI not use "alias" field value in the response:

POST _opendistro/_sql
{  
  "query": "select account_number AS num from accounts limit 1"
}

{
  "schema": [{
    "name": "account_number",
    "alias": "num",
    "type": "long"
  }],
  "total": 1000,
  "datarows": [[1]],
  "size": 1,
  "status": 200
}