dweiss commented on PR #14350:
URL: https://github.com/apache/lucene/pull/14350#issuecomment-2724062564
I don't know Unicode as well as Rob so I can't say what these alternate case
folding
equivalence classes are... but they definitely don't have a "canonical"
representation
with regard to Character.toLowercase. Consider the killer Turkish dotless i,
for example:
```
public void testCornerCase() throws Exception {
List<BytesRef> terms = Stream.of(
"aIb", "aıc")
.map(s -> {
int[] lowercased =
s.codePoints().map(Character::toLowerCase).toArray();
return new String(lowercased, 0, lowercased.length);
})
.map(LuceneTestCase::newBytesRef)
.sorted()
.collect(Collectors.toCollection(ArrayList::new));
Automaton a = build(terms, false, true);
System.out.println(a.toDot());
assertTrue(a.isDeterministic());
}
```
which yields:
It would take some kind of character normalization filter on both the index
and automaton building/expansion side for this to work.
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