DB.Select("ANY_VALUE(visitor_id) visitor_id,ANY_VALUE(id) id,ANY_VALUE(Content) content").Where("visitor_id in (? )",visitorIds).Group("visitor_id").Find(&messages)
subQuery:=DB.
Table("message").
Where(" visitor_id in (? )",visitorIds).
Order("id desc").
Limit(1024).
SubQuery()
DB.Raw("SELECT ANY_VALUE(visitor_id) visitor_id,ANY_VALUE(id) id,ANY_VALUE(content) content FROM ? message_alia GROUP BY visitor_id",subQuery).Scan(&messages)