{
  "context": "This evaluation assesses how well the engineer uses the apache-airflow-providers-ftp package to perform in-memory FTP file operations using file-like buffer objects. The focus is on proper usage of FTPHook with BytesIO or StringIO to avoid disk I/O.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "FTPHook instantiation",
      "description": "Uses FTPHook class from airflow.providers.ftp.hooks.ftp to establish FTP connection with proper connection parameters (host, username, password)",
      "max_score": 15
    },
    {
      "name": "BytesIO for download",
      "description": "Uses BytesIO (or similar file-like buffer object from io module) to store downloaded file content in memory when calling retrieve_file() method",
      "max_score": 25
    },
    {
      "name": "retrieve_file() usage",
      "description": "Correctly uses FTPHook.retrieve_file() method with remote path and file-like buffer object to download the CSV file from FTP server",
      "max_score": 20
    },
    {
      "name": "BytesIO for upload",
      "description": "Uses BytesIO (or similar file-like buffer object from io module) to hold processed CSV content before uploading, properly seeking to beginning of buffer before upload",
      "max_score": 20
    },
    {
      "name": "store_file() usage",
      "description": "Correctly uses FTPHook.store_file() method with remote path and file-like buffer object to upload the processed CSV file to FTP server",
      "max_score": 20
    }
  ]
}