IEnumerator <Tup> GetGroupEnumerator()
{
var index = RelStatic.BuildIndex(_source, _kmap);
foreach (var kvp in index)
{
var rva = kvp.Value.Select(t => new CommonRow(_tmap.Select(x => t[x]))).ToArray();
var newtuple = RelStatic.CreateByMap <Tup>(kvp.Key, _map, rva);
Logger.Assert(newtuple.Degree == Heading.Degree);
yield return(newtuple);
}
}
// enumerator for full join and compose (only the output is different)
IEnumerator <Tup> GetFull()
{
var index = RelStatic.BuildIndex(_rightarg, _jmapright);
var hash = new HashSet <TupBase>();
foreach (var tuple in _leftarg)
{
var key = RelStatic.CreateByMap <Tup>(tuple, _jmapleft);
if (index.ContainsKey(key))
{
foreach (var tother in index[key])
{
var newtuple = RelStatic.CreateByMap <Tup>(tuple, _tmapleft, tother, _tmapright);
if (!hash.Contains(newtuple))
{
hash.Add(newtuple);
Logger.Assert(newtuple.Degree == Heading.Degree);
yield return(newtuple);
}
}
}
}
}