code: def process_result_value(self, value, dialect):
          
          if value is None:
              return None
  
          p = value.split("|")
  
          if len(p) == 0:
              return None
          return SourceLocation(*map(int, p))
docs: SQLAlchemy uses this to convert a string into a SourceLocation object.
          We separate the fields by a |