// OLD Table
{
    "tableName": "post",
    "dbName": "medium",
    "owner": "root",
    "createTime": 1569766653,
    "lastAccessTime": 0,
    "retention": 0,
    "sd": {
        "cols": [
            {
                "name": "code",
                "type": "int",
                "comment": null,
                "setType": true,
                "setName": true,
                "setComment": false
            },
            {
                "name": "text",
                "type": "string",
                "comment": null,
                "setType": true,
                "setName": true,
                "setComment": false
            }
        ],
        "location": "hdfs://namenode:8020/user/hive/warehouse/medium.db/post",
        ...
}

// NEW Table
{
    "tableName": "post",
    "dbName": "medium",
    "owner": "root",
    "createTime": 1569766653,
    "lastAccessTime": 0,
    "retention": 0,
    "sd": {
        "cols": [
            {
                "name": "code",
                "type": "int",
                "comment": null,
                "setType": true,
                "setName": true,
                "setComment": false
            },
            {
                "name": "text",
                "type": "string",
                "comment": null,
                "setType": true,
                "setName": true,
                "setComment": false
            },
            {
                "name": "release_date",
                "type": "string",
                "comment": "Release date for this post",
                "setType": true,
                "setName": true,
                "setComment": true
            }
        ],
        "location": "hdfs://namenode:8020/user/hive/warehouse/medium.db/post",
        ...
}