{
  "context": "This criteria evaluates how well the engineer uses ConnectorX's protocol selection capabilities to optimize database queries. It focuses specifically on proper usage of the protocol parameter in read_sql() and understanding when to use binary vs CSV protocols.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Import connectorx",
      "description": "The solution imports the connectorx package (typically as 'import connectorx as cx')",
      "max_score": 10
    },
    {
      "name": "Use read_sql function",
      "description": "The solution uses connectorx.read_sql() or cx.read_sql() as the primary method to load data from the database",
      "max_score": 20
    },
    {
      "name": "Binary protocol selection",
      "description": "When bandwidth is 'high', the solution correctly passes protocol='binary' to the read_sql() function",
      "max_score": 25
    },
    {
      "name": "CSV protocol selection",
      "description": "When bandwidth is 'low', the solution correctly passes protocol='csv' to the read_sql() function",
      "max_score": 25
    },
    {
      "name": "Return protocol used",
      "description": "The solution returns the protocol name ('binary' or 'csv') as part of the tuple, correctly identifying which protocol was used",
      "max_score": 10
    },
    {
      "name": "Input validation",
      "description": "The solution validates the bandwidth parameter and raises ValueError for invalid values (not 'high' or 'low')",
      "max_score": 10
    }
  ]
}