That's not true: have a look at the "else"-block.
The problem is that lucene's FieldDocSortedHitQueue does only test for null
values if uses the type FieldDoc.STRING. With FieldDoc.CUSTOM lucene assumes
ci to be never null:
FieldDocSortedHitQueue 163-166:
case SortField.CUSTOM:{
c = docA.fields[i].compareTo
(docB.fields[i]);
break;
}
If I have null values in the field that I want to sort by: I can not use a
custom SortComparator.
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