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https://doris.apache.org/zh-CN/docs/dev/releasenotes/release-1.2.0#2-%E5%9C%A8-unique-key-%E6%A8%A1%E5%9E%8B%E4%B8%8A%E5%AE%9E%E7%8E%B0%E4%BA%86-merge-on-write-%E7%9A%84%E6%95%B0%E6%8D%AE%E6%9B%B4%E6%96%B0%E6%A8%A1%E5%BC%8F