Gorm syntax error at position 74 near ':'

GORM Playground Link

https://github.com/go-gorm/playground/pull/1

Description

rawSql := "select d.* from image_info as d inner join (SELECT a.image_name, @rownum:=@rownum+1 as rownum FROM (SELECT image_name FROM image_info group by image_name order by max(db_id)) a,(SELECT @rownum:=0) b) as c on d.image_name = c.image_name order by c.rownum desc"
err := db.Db.Raw(rawSql).Scan(&imageInfoList).Error

err output is syntax error at position 74 near ':'

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