小编Rya*_*yan的帖子

有谁知道如何用字符串替换列中的空值，直到它遇到一个新字符串，然后该字符串替换它下面的所有空值？我有一个看起来像这样的专栏

原始列：

PAST_DUE_COL           
91 or more days pastdue        
Null
Null
61-90 days past due          
Null
Null
31-60 days past due
Null
0-30 days past due
Null       
Null
Null            

预期结果栏：

PAST_DUE_COL           
91 or more days past due        
91 or more days past due
91 or more days past due
61-90 days past due          
61-90 days past due 
61-90 days past due 
31-60 days past due
31-60 days past due
0-30 days past due
0-30 days past due      
0-30 days past due …