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);
}
public GroupByStreamMergedDataReader(IDictionary <string, int> labelAndIndexMap, List <IStreamDataReader> streamDataReaders, SelectCommandContext selectCommandContext, SchemaMetaData schemaMetaData) : base(streamDataReaders, selectCommandContext, schemaMetaData)
{
this._selectCommandContext = selectCommandContext;
_currentRow = new List <object>(labelAndIndexMap.Count);
_currentGroupByValues = OrderByValuesQueue.IsEmpty()
? new List <object>(0) : new GroupByValue(GetCurrentStreamDataReader(), selectCommandContext.GetGroupByContext().GetItems()).GetGroupValues();
}
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());
}
public override bool Read()
{
_currentRow.Clear();
if (OrderByValuesQueue.IsEmpty())
{
return(false);
}
if (IsFirstNext)
{
base.Read();
}
if (AggregateCurrentGroupByRowAndNext())
{
_currentGroupByValues = new GroupByValue(GetCurrentStreamDataReader(), _selectCommandContext.GetGroupByContext().GetItems()).GetGroupValues();
}
return(true);
}
