如何在django-cassandra模型中定义varchar字段。

from cassandra.cqlengine import columns
from django_cassandra_engine.models import DjangoCassandraModel

class ChatEvent(DjangoCassandraModel):
    interview_id = columns.UUID(partition_key=True)
    fire_time = columns.DateTime(primary_key=True, clustering_order="DESC")
    id = columns.UUID(primary_key=True)
    type = //to be varchar type
    data = columns.Text(required=True)
    created_by = columns.UUID(required=True)

此文档列出了所有数据类型，但没有varchar类型https://docs.datastax.com/en/drivers/python/2.5/api/cassandra/cqlengine/columns.html#：~：text=列%20in%20your%20models%20map，一个%20non%2dprimary%20key%20column。