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the last line `return table, buildDSL(querydsl, from, size, string(aggsdsl), []string{}, colArr), nil` should be `return table, buildDSL(querydsl, from, size, string(aggsdsl), orderByArr , colArr), nil`
用官方的推荐的方法可以省略了后面的二次遍历更好一点。只是边界略不好理解一点 ``` func middleNode(head *ListNode) *ListNode { slow,fast := head,head for fast != nil && fast.Next != nil { slow = slow.Next fast= fast.Next.Next } return slow } ```