human
Solve the following python programming problem given the following code:
def filter_metadata_diff(self, diff) : 
    def removed_column(element) : 
        column_whitelist = { 
            'instances' : ['scheduled_at'], 
} 
        if (element [0] != 'remove_column') : 
            return False 
(table_name, column) = (element [2], element [3]) 
        return ((table_name in column_whitelist) and (column.name in column_whitelist [table_name])) 
return [removed_column for element in diff if (not removed_column (element))] 

    
    

    Fix the buggy line: return [removed_column for element in diff if (not removed_column (element))]
assistant
#Here is Python code to fix the buggy line: return [removed_column for element in diff if (not removed_column (element))]
.

return [element for element in diff if (not removed_column (element))]