public interface TupleCalc extends Calc
The tuple is represented as an array of
null to represent the null tuple.
When implementing this interface, it is convenient to extend
AbstractTupleCalc, but it is not required.
|Modifier and Type||Method and Description|
Evaluates this expression to yield a tuple.
A tuple cannot contain any null members. If any of the members is null, this method must return a null.
evaluator- Evaluation context
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