// Return value of attribute with tuple indexing
// FIX: needs to get from this row to some other row via parent table to use as lookup
public TypedValue ValueOffset(ExpressionEval expr, int index, OffsetModes mode)
{
var parent = Parent as DataTableLocal;
Logger.Assert(parent != null);
var ord = OrderedIndex.Offset(this, index, mode);
var value = (ord == -1) ? expr.ReturnType.DefaultValue()
: expr.EvalOpen(parent.GetRow(ord));
return(value);
}
// Return ordinal value for row, optionally within group
public NumberValue Ordinal(bool isgroup)
{
var ret = isgroup ? OrderedIndex.Offset(this, 0, OffsetModes.Absolute) : Order;
return(NumberValue.Create(ret));
}