[Feature request] Enum-class that allows to have Columns as values

[SemyonSinchenko]

I want to have an Enum-like class with the same functionality as python Enum but with an ability to use pyspark.sql.Column as a type of values. The existed built-in Enum uses __eq__ method to check that a new added value is an alias to existed one:

        # If another member with the same value was already defined, the
        # new member becomes an alias to the existing one.
        try:
            try:
                # try to do a fast lookup to avoid the quadratic loop
                enum_member = enum_class._value2member_map_[value]
            except TypeError:
                for name, canonical_member in enum_class._member_map_.items():
                    if canonical_member._value_ == value:
                        enum_member = canonical_member
                        break
                else:
                    raise KeyError

But for pyspark.sql.Column method __eq__ returns not bool but Column and we are getting an error here: ValueError: Cannot convert column into bool: please use '&' for 'and', '|' for 'or', '~' for 'not' when building DataFrame boolean expressions.