func (ts *TripleStore) optimizeLinksTo(it *iterator.LinksTo) (graph.Iterator, bool) {
subs := it.GetSubIterators()
if len(subs) != 1 {
return it, false
}
primary := subs[0]
if primary.Type() == "fixed" {
size, _ := primary.Size()
if size == 1 {
val, ok := primary.Next()
if !ok {
panic("Sizes lie")
}
newIt := ts.GetTripleIterator(it.Direction(), val)
newIt.CopyTagsFrom(it)
for _, tag := range primary.Tags() {
newIt.AddFixedTag(tag, val)
}
it.Close()
return newIt, true
}
}
return it, false
}
