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Method that must be implemented by every non-abstract relation; it returns the next tuple of the enumeration, if any. Methods next and hasNext use the return value of internalNext and additionally remove any duplicate tuples from the output enumeration. Hence a call to next may result in multiple calls to the relation's internalNext, if the tuples returned are already part of the result (this is especially true of Projections.
- Returns:
- The next tuple,
null
if no such tuple exists
Implements ca.uqac.dim.ddb.Relation.
Member Data Documentation
The documentation for this class was generated from the following file: