private static IDisposable ReadStats(DocumentsOperationContext context, Table table, TimeSeriesSliceHolder slicer, out long count, out DateTime start, out DateTime end, out Slice name)
{
count = 0;
start = DateTime.MaxValue;
end = DateTime.MinValue;
name = slicer.NameSlice;
if (table.ReadByKey(slicer.StatsKey, out var tvr) == false)
{
return(null);
}
count = DocumentsStorage.TableValueToLong((int)StatsColumns.Count, ref tvr);
start = new DateTime(Bits.SwapBytes(DocumentsStorage.TableValueToLong((int)StatsColumns.Start, ref tvr)));
end = DocumentsStorage.TableValueToDateTime((int)StatsColumns.End, ref tvr);
if (count == 0 && start == default && end == default)
{
// this is delete a stats, that we re-create, so we need to treat is as a new one.
start = DateTime.MaxValue;
end = DateTime.MinValue;
return(null);
}
return(DocumentsStorage.TableValueToSlice(context, (int)StatsColumns.Name, ref tvr, out name));
}