If values in the specified column are null, returns the value.
Can be used in conjunction with when to specify a default value for expressions.
     
    
    Usage
    otherwise(x, value)
# S4 method for class 'Column'
otherwise(x, value)
 
    
    Arguments
- x
- a Column. 
- value
- value to replace when the corresponding entry in - xis NA.
Can be a single value or a Column.
 
 
    
    Note
    otherwise since 1.5.0