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support gh-ost precheck #317

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@sjjian

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@sjjian

背景

有重复数据时,加唯一索引,ghost会默认覆盖重复的数据(ghost的bug,还未修复:fix data-integrity problem when add unique key by cenkore · Pull Request #912 · github/gh-ost ,用mysql原生是没问题的 )

建议

SQLE DDL上线时可以自动调用gh-ost,建议考虑增加个提示:有重复数据时加唯一索引要用mysql原生的方式上线。

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