Mapping name collision about csv2influx HOT 4 CLOSED

@rozetko I believe we don't have this issue after "from - to swap in out config file"

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@jonyrock yes, but I guess we should warn user if he has two similar keys in "fieldSchema".
Eg:

{
  "measurementName": "traffic",
  "influxdbUrl": "http://127.0.0.1:8086/test",
  "mapping": {
    "fieldSchema": {
      "Date": {
        "from": "Date",
        "type": "timestamp",
        "format": "jsDate"
      },
      "test": {
        "from": "CO(GT)",
        "type": "string"
      },
      "test": {
        "from": "NMHC(GT)",
        "type": "string"
      }
    }
  },
  "csv": {
    "delimiter": ";"
  }
}

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@rozetko it is not possible cuz keys in json must be unique

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@jonyrock I tested, node.js parses it as a valid json, keeping the last of duplicate keys. So, user can make a typo and one of fields wouldn't appear at influx.

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