最近，有个客户刚刚完成了MySQL数据库的升级，将版本从5.7提升到了8.0，但却意外发现查询性能下滑得如同过山车。这背后的罪魁祸首，竟然是MySQL 8.0针对排序方式的调改，导致了优化器的失效。接下来，让我们深入探讨这个问题，并呼吁其他已升级用户进行自我检查。

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