Does TiFlash replication require a table to have a primary key?

Translated
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This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: TiFlash复制是否要求必须表有主键？

| username: alfred

【TiDB Usage Environment】Production\Test Environment\POC
【TiDB Version】
【Encountered Issues】
【Reproduction Path】What operations were performed that caused the issue
【Issue Phenomenon and Impact】
【TiDB Operator Version】：
【K8s Version】：
【Attachments】：

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| username: yilong | Original post link

Not needed.

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| username: alfred | Original post link

What kind of primary key is being referred to in the course?

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| username: yilong | Original post link

Which course and which part of the information are you referring to?