// which streams are to this table an outer stream
private static ISet<int> GetOuterStreams(
int fromStream,
ISet<int> toStreams,
OuterInnerDirectionalGraph outerInnerGraph)
{
ISet<int> outerStreams = new HashSet<int>();
foreach (var toStream in toStreams) {
if (outerInnerGraph.IsOuter(toStream, fromStream)) {
outerStreams.Add(toStream);
}
}
return outerStreams;
}
