public override bool Read()
{
if (OrderByValuesQueue.IsEmpty())
{
return(false);
}
if (IsFirstNext)
{
IsFirstNext = false;
return(true);
}
OrderByValue firstOrderByValue = OrderByValuesQueue.Poll();
if (firstOrderByValue.MoveNext())
{
OrderByValuesQueue.Offer(firstOrderByValue);
}
if (OrderByValuesQueue.IsEmpty())
{
return(false);
}
SetCurrentStreamDataReader(OrderByValuesQueue.Peek().GetStreamDataReader());
return(true);
}
private void OrderResultSetsToQueue(List <IStreamDataReader> streamDataReaders, SelectCommandContext selectCommandContext, SchemaMetaData schemaMetaData)
{
foreach (var queryResult in streamDataReaders)
{
OrderByValue orderByValue = new OrderByValue(queryResult, OrderByItems, selectCommandContext, schemaMetaData);
if (orderByValue.MoveNext())
{
OrderByValuesQueue.Offer(orderByValue);
}
}
SetCurrentStreamDataReader(OrderByValuesQueue.IsEmpty() ? streamDataReaders[0] : OrderByValuesQueue.Peek().GetStreamDataReader());
}