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In the original csv loader, although columns_to_read is of List[str] type, only the first value of columns_to_read is obtained in the specific logic. This has been improved so that the logic can read multiple fields normally.
原来的csv加载器中,虽然columns_to_read是List[str]类型,但是具体逻辑中只获取了columns_to_read的第一个值,这里进行了完善,使得逻辑能够正常读取多个字段