The function should return an estimate of uncompressed byte size of its arguments in memory.
E.g. for UInt32 argument it will return constant 4, for String argument - the string length + 9.
The function can take multiple arguments. The typical application is `byteSize(*)`.

**Use case**
Suppose you have a service that stores data for multiple clients in one table. Users will pay per data volume. So, you need to implement accounting of users data volume. The function will allow to calculate the data size on per-row basis.
/** Return the promoted numeric data type of the current data type. Throw an exception if `canBePromoted() == false`.
      */
    virtual DataTypePtr promoteNumericType() const;
    /** Directly insert default value into a column. Default implementation use method IColumn::insertDefault.
      * This should be overridden if data type default value differs from column default value (example: Enum data types).
      */
    virtual void insertDefaultInto(IColumn & column) const;
    
    virtual bool equals(const IDataType & rhs) const = 0;
    
    /** The data type is dependent on parameters and types with different parameters are different.
      * Examples: FixedString(N), Tuple(T1, T2), Nullable(T).
      * Otherwise all instances of the same class are the same types.
      */
    virtual bool isParametric() const = 0;
    /** The data type is dependent on parameters and at least one of them is another type.
      * Examples: Tuple(T1, T2), Nullable(T). But FixedString(N) is not.
      */
    virtual bool haveSubtypes() const = 0;
    /** Can appear in table definition.
      * Counterexamples: Interval, Nothing.
      */
    virtual bool cannotBeStoredInTables() const { return false; }