Runtime Exception about mod-playerbots HOT 2 OPEN

原因：使用GROUP BY 语句违背了sql_mode=only_full_group_by。因为mysql版本5.7之后默认的模式是ONLY_FULL_GROUP_BY。需要去掉这个设置。按下面这样设置：
1.先使用下面SQL预计查询 sql_mode：
SELECT @@GLOBAL.sql_mode;
可以得到下面结果：
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
2.然后调用下面sql语句重新设置sql_mode，删除ONLY_FULL_GROUP_BY：
SET GLOBAL.sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';

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@YuLongGongWu this should be resolved, please close out

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