Sets a listener to receive events that are unmatched by any statement.
Events that can be unmatched are all events that are send into a runtime via one
of the sendEvent methods, or that have been generated via insert-into clause.
For an event to be unmatched by any statement, the event must not match any
statement's event stream filter criteria (a where-clause is NOT a filter criteria for a stream, as below).
Note: In the following statement a MyEvent event does always match
this statement's event stream filter criteria, regardless of the value of the 'quantity' property.
select * from MyEvent where quantity > 5
In the following statement only a MyEvent event with a 'quantity' property value of 5 or less does not match
this statement's event stream filter criteria:
select * from MyEvent(quantity > 5)
For patterns, if no pattern sub-expression is active for such event, the event is also unmatched.