// create subselect information
SubSelectActivationCollection subSelectStreamDesc = EPStatementStartMethodHelperSubselect.createSubSelectActivation(services, statementSpec, statementContext);
// obtain activator
final StreamSpecCompiled streamSpec = statementSpec.getStreamSpecs().get(0);
ViewableActivator activator;
String triggereventTypeName = null;
EventType activatorResultEventType;
if (streamSpec instanceof FilterStreamSpecCompiled)
{
FilterStreamSpecCompiled filterStreamSpec = (FilterStreamSpecCompiled) streamSpec;