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.
otherwise(x, value)# S4 method for Column
otherwise(x, value)
a Column.
value to replace when the corresponding entry in x is NA.
Can be a single value or a Column.
Other colum_func: alias,
between, cast,
endsWith, over,
startsWith, substr