{
  "data_source": "sample_data.csv",
  "file_type": ".csv",
  "total_columns": 8,
  "schema": {
    "columns": [
      {
        "name": "日期",
        "type": "date",
        "category": "dimension",
        "description": "数据日期",
        "unique_count": 3,
        "sample_values": ["2024-01-01", "2024-01-02", "2024-01-03"]
      },
      {
        "name": "地区",
        "type": "string",
        "category": "dimension",
        "description": "销售区域",
        "unique_count": 4,
        "sample_values": ["北京", "上海", "广州"]
      },
      {
        "name": "产品ID",
        "type": "string",
        "category": "dimension",
        "description": "产品标识",
        "unique_count": 1,
        "sample_values": ["P001"]
      },
      {
        "name": "销售额",
        "type": "numeric",
        "category": "measure",
        "description": "销售金额（元）",
        "unique_count": 10,
        "sample_values": ["10000", "12000", "9500"]
      },
      {
        "name": "订单数",
        "type": "numeric",
        "category": "measure",
        "description": "订单数量",
        "unique_count": 10,
        "sample_values": ["50", "60", "48"]
      },
      {
        "name": "用户数",
        "type": "numeric",
        "category": "measure",
        "description": "访问用户数",
        "unique_count": 10,
        "sample_values": ["2000", "2200", "1900"]
      },
      {
        "name": "转化率",
        "type": "numeric",
        "category": "measure",
        "description": "订单转化率",
        "unique_count": 6,
        "sample_values": ["0.025", "0.027", "0.025"]
      },
      {
        "name": "是否促销",
        "type": "boolean",
        "category": "dimension",
        "description": "是否有促销活动",
        "unique_count": 2,
        "sample_values": ["Yes", "No"]
      }
    ]
  },
  "sample_data": [
    {
      "日期": "2024-01-01",
      "地区": "北京",
      "产品ID": "P001",
      "销售额": 10000,
      "订单数": 50,
      "用户数": 2000,
      "转化率": 0.025,
      "是否促销": "Yes"
    }
  ]
}