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为什么DuplicateFilter不能与其他过滤器一起使用？例如，如果测试DuplicateFilterTest的一点重拍，然后的印象是，过滤器没有被施加到其他的过滤器和第一修剪的结果：Lucene DuplicateFilter问题
public void testKeepsLastFilter()
throws Throwable {
DuplicateFilter df = new DuplicateFilter(KEY_FIELD);
df.setKeepMode(DuplicateFilter.KM_USE_LAST_OCCURRENCE);
Query q = new ConstantScoreQuery(new ChainedFilter(new Filter[]{
new QueryWrapperFilter(tq),
// new QueryWrapperFilter(new TermQuery(new Term("text", "out"))), // works right, it is the last document.
new QueryWrapperFilter(new TermQuery(new Term("text", "now"))) // why it doesn't work? It is the third document, but hits count is 0.
}, ChainedFilter.AND));
// this varians doesn't hit too:
// ScoreDoc[] hits = searcher.search(new FilteredQuery(tq, df), new QueryWrapperFilter(new TermQuery(new Term("text", "now"))), 1000).scoreDocs;
// ScoreDoc[] hits = searcher.search(new FilteredQuery(tq, new QueryWrapperFilter(new TermQuery(new Term("text", "now")))), df, 1000).scoreDocs;
ScoreDoc[] hits = searcher.search(q, df, 1000).scoreDocs;
assertTrue("Filtered searching should have found some matches", hits.length > 0);
for (int i = 0; i < hits.length; i++) {
Document d = searcher.doc(hits[i].doc);
String url = d.get(KEY_FIELD);
TermDocs td = reader.termDocs(new Term(KEY_FIELD, url));
int lastDoc = 0;
while (td.next()) {
lastDoc = td.doc();
}
assertEquals("Duplicate urls should return last doc", lastDoc, hits[i].doc);
}
}