private IStreamDataReader GetGroupByMergedResult(List <IStreamDataReader> streamDataReaders, SelectCommandContext selectCommandContext,
IDictionary <string, int> columnLabelIndexMap, SchemaMetaData schemaMetaData)
{
if (selectCommandContext.IsSameGroupByAndOrderByItems())
{
return(new GroupByStreamMergedDataReader(columnLabelIndexMap, streamDataReaders, selectCommandContext,
schemaMetaData));
}
return(new GroupByMemoryMergedDataReader(streamDataReaders, selectCommandContext, schemaMetaData));
}
private bool IsMaxRowCount(SelectCommandContext shardingCommand)
{
return((shardingCommand.GetGroupByContext().GetItems().Any() ||
shardingCommand.GetProjectionsContext().GetAggregationProjections().Any()) && !shardingCommand.IsSameGroupByAndOrderByItems());
}