public DtblStream(Stream stream, BatchInfo ix, int skip = 0, int take = int.MaxValue)
: base(ix.PrimaryKeyFieldName)
{
_dataFile = stream;
_ix = ix;
_dataFile.Seek(_ix.KeyIndexOffset, SeekOrigin.Begin);
var keyIndex = TableSerializer.ReadKeyIndex(_dataFile, _ix.KeyIndexSize);
_hashReader = new DocHashReader(_dataFile, _ix.DocHashOffset, leaveOpen: false);
_addressReader = new DocumentAddressReader(_dataFile, _ix.DocAddressesOffset);
_documentReader = new DocumentReader(_dataFile, _ix.Compression, keyIndex, leaveOpen: false);
_skip = skip;
_take = take;
}