Commits on Sep 28, 2023

1. [fix](Nereids) should not replace slot by Alias when do NormalizeSlot …

   when we do NormalizeToSlot, we pushed complex expression and only remain
   slot of it. When we do this, we collect alias and their child and
   compute its child in bottom project, remain the result slot in current
   node. for example
   
   Window(max(...), c1 as a1)
   
   after normalization, we get
   
   Window(max(...), a1)
   +-- Project(..., c1 as a1)
   
   But, in some cases, we remove some SlotReference by mistake, for example
   
   Window(max(...), c1, c1 as a1)
   
   after normalization, we get
   
   Window(max(...), a1)
   +-- Project(..., c1 as a1)
   
   we lost the SlotReference c1. This PR fix this problem. After this Pr,
   we get
   
   Window(max(...), c1, a1)
   +-- Project(..., c1, c1 as a1)

   

   morrySnow committed Sep 28, 2023
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