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Unit of expression. A unit of expression is a building block for composing an expression, such as update expression, condition (aka filter) expression, and projection Expression.
abstract class UnitOfExpression {
Returns this unit of expression as a string substituted if necessary with tokens using the given substitution context.

context the substitution context which may get mutated as a side effect upon completion of this method
    abstract String asSubstituted(SubstitutionContext context);
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