public static IEnumerator<EventBean> For(
IEnumerator<EventBean> sourceIterator,
ResultSetProcessorRowPerGroup resultSetProcessor,
AggregationService aggregationService,
ExprEvaluatorContext exprEvaluatorContext)
{
var eventsPerStream = new EventBean[1];
var priorSeenGroups = new HashSet<object>();
var hasHavingClause = resultSetProcessor.HasHavingClause;
while (sourceIterator.MoveNext()) {
eventsPerStream[0] = sourceIterator.Current;
var groupKey = resultSetProcessor.GenerateGroupKeySingle(eventsPerStream, true);
aggregationService.SetCurrentAccess(groupKey, exprEvaluatorContext.AgentInstanceId, null);
if (hasHavingClause) {
var pass = resultSetProcessor.EvaluateHavingClause(eventsPerStream, true, exprEvaluatorContext);
if (!pass) {
continue;
}
}
if (priorSeenGroups.Contains(groupKey)) {
continue;
}
priorSeenGroups.Add(groupKey);
yield return resultSetProcessor.SelectExprProcessor.Process(
eventsPerStream,
true,
true,
exprEvaluatorContext);
}
}