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UserAggregateQuery Sample
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The user aggregate sample demonstrates the usage of a user-defined aggregate.
It applies a time-weighted avergae aggregation to the input stream, within a
hopping time window.

This sample uses the data simulator input adapter as event source and displays
the result in the console window through the trace output adapter.
The data simulator specifies its advance time policy in the adapter factory, so
it is not necessary to do that in the application, or to enqueue CTIs in the
adapter itself.
