Continuation, found a bug but I'm not sure whether it's in Lucene or
Lucene's Javadoc.
In MultiFields:
@SuppressWarnings({"unchecked","rawtypes"})
@Override
public Iterator<String> iterator() {
Iterator<String> subIterators[] = new Iterator[subs.length];
for(int i=0;i<subs.length;i++) {
subIterators[i] = subs[i].iterator();
}
return new MergedIterator<>(subIterators);
}
MergedIterator says in the Javadoc:
"The behavior is undefined if the iterators are not actually sorted."
And indeed, the iterators are _not_ actually sorted. So I look at
where they come from, Fields#iterator(), which is documented fairly
tersely:
"Returns an iterator that will step through all fields names.
This will not return null."
Which doesn't say anything about the names being in order. So I assume
that either:
(a) Fields#iterator() is actually supposed to be sorted and the
documentation should specify it but doesn't, or
(b) Fields#iterator() is not supposed to be sorted, but either
MultiFields#iterator() or MergedIterator is supposed to be handling
this better.
Either way, I think it's a bug in Lucene. But since I don't know which
direction it's in, and I don't have a reproducible test case I can
just hand over, I can't easily file it. :/
TX
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