A value must implement this interface if it is to be embedded as a SqlLiteral of type SYMBOL. If the class is an {@link Enum} it triviallyimplements this interface.
The {@link #toString()} method should return how the symbol should beunparsed, which is sometimes not the same as the enumerated value's name (e.g. "UNBOUNDED PRECEDING" versus "UnboundedPreceeding").
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