Gogs数据迁移失败 The maximum column size is 767 bytes

[FATAL] […o/gogs/internal/route/install.go:75 GlobalInit()] Failed to initialize ORM engine: auto migrate “LFSObject”: Error 1709: Index column size too large. The maximum column size is 767 bytes.
请问数据库怎么设置,创建数据库的时候是用的script里面的mysql.sql。首次运行程序点完确定gogs就启动不了了