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Calcite | Level 5

Hello I would like to do something very simple but that I struggle with : 


I have a table with several columns and 1 specifically that have missing values that i want to fill with a backward then a forward fill stragegy based on a ID column. 


have : 

ID   colA  colB    Coltofill                       

1      ...        ...                     


1                               5    

2                              12    



want : 

ID   colA  colB    Coltofill                       

1      ...        ...           5        

1                               5                                   

1                               5    

2                              12    

2                              12


More precisely i want to only fill the col "Coltofill". I found a good reponse in this post :  But the problem is that it fills every columns. 


Thank you !




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