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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def serialize(self, value, greedy=True):
 """ Greedy serialization requires the value to either be a column or convertible to a column, whereas non-greedy serialization will pass through any string as-is and will only serialize Column objects. Non-greedy serialization is useful when preparing queries with custom filters or segments. """


        if greedy and not isinstance(value, Column):
            value = self.normalize(value)

        if isinstance(value, Column):
            return value.id
        else:
            return value