生成带标题的CSV文件 [英] Generate CSV files with headers

问题描述

我正在从元组生成CSV输出.我找不到在文件中生成标头的方法.谁能确认这是否可行?

I am generating CSV outputs from tuples. I can't find a way of generating headers in the files. Could anyone confirm whether this is possible or not?

推荐答案

这可能是可行的，但我还没有找到.我在上游添加了一个flatmap函数，该函数(a)将输出POJO转换为字符串，并且(b)一次性插入标题行.但是对于状态恢复存在一些担忧，以确保状态恢复始终且仅被写入一次.

it might be possible, but I haven't found it. I added a flatmap function upstream that (a) converted the output POJO to a string, and (b) did a one-shot injection of the header row. But there are concerns with state recovery, to ensure it always and only gets written out once.

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