{
    "columns": [
        {
            "name": "INT_COLUMN",
            "column_type": "Int"
        },
        {
            "name": "STRING_COLUMN",
            "column_type": "String",
            "nullable": false
        },
        {
            "name": "DATE_COLUMN",
            "column_type": "Date",
            "format": "%Y-%m-%d"
        },
        {
            "name": "ENUM_COLUMN",
            "column_type": "Enum",
            "nullable": false,
            "legal_vals": ["V1", "V2", "V3"],
            "illegal_val_replacement": "V1"
        }
    ]
}