private TCINFO GetTableContextInfo(NID[] nodePath)
{
var hnHeader = heapOnNodeReader.GetHeapOnNodeHeader(nodePath);
var heapItem = heapOnNodeReader.GetHeapItem(nodePath, hnHeader.UserRoot);
return(TCINFO.OfValue(heapItem));
}
public Maybe <TableRow> GetRow(NID[] nodePath, int rowIndex)
{
var hnHeader = heapOnNodeReader.GetHeapOnNodeHeader(nodePath);
var userRootHeapItem = heapOnNodeReader.GetHeapItem(nodePath, hnHeader.UserRoot);
var tcInfo = TCINFO.OfValue(userRootHeapItem);
var cebStartingOffset = tcInfo.GroupsOffsets[2];
var rowLength = tcInfo.GroupsOffsets[3];
var rowMatrixHnid = HNID.OfValue(tcInfo.RowMatrix);
if (rowMatrixHnid.IsZero)
{
return(Maybe <TableRow> .NoValue());
}
if (rowMatrixHnid.IsHID)
{
var heapItem = heapOnNodeReader.GetHeapItem(nodePath, rowMatrixHnid.HID);
var encodedRows = heapItem.Slice(rowLength);
var rowValues = rowValuesExtractor.Extract(encodedRows[rowIndex], tcInfo.ColumnDescriptors, cebStartingOffset);
return(Maybe <TableRow> .OfValue(new TableRow(rowValues)));
}
else
{
var numberOfRowsPerBlock = (8 * 1024 - 16) / rowLength;
var blockIndex = rowIndex / numberOfRowsPerBlock;
var childNodePath = new List <NID>(nodePath)
{
rowMatrixHnid.NID
};
var dataBlock = dataTreeReader.Read(childNodePath.ToArray(), blockIndex)[0];
var encodedRows = dataBlock.Slice(rowLength);
var rowValues = rowValuesExtractor.Extract(encodedRows[rowIndex], tcInfo.ColumnDescriptors, cebStartingOffset);
return(Maybe <TableRow> .OfValue(new TableRow(rowValues)));
}
}
