{
  "1": {
    "method": "changeColumn",
    "params": [
      "core_validating",
      "prev_email",
      {
        "name": "new_email",
        "type": "VARCHAR",
        "length": 150,
        "decimals": null,
        "values": [],
        "allow_null": false,
        "default": "0",
        "comment": "",
        "unsigned": false,
        "auto_increment": false
      }
    ]
  }
}