docs: def parse_table(fq_table: str) -> Tuple[str, str]:
      """Parse a tablename into tuple(<schema>, <table>).
  
      Schema defaults to doc if the table name doesn't contain a schema.
  
      >>> parse_table('x.users')
      ('x', 'users')
  
      >>> parse_table('users')
      ('doc', 'users')
      """
      parts = fq_table.split('.')
      if len(parts) == 1:
          return 'doc', parts[0]
      elif len(parts) == 2:
          return parts[0], parts[1]
      else:
          raise ValueError