MatchAllDocsQuery, MultiSearcher and a custom HitCollector throwing exception

[jm]

Hi,

I have encountered an issue with lucene1.9.1. It involves
MatchAllDocsQuery, MultiSearcher and a custom HitCollector. The
following code throws  java.lang.UnsupportedOperationException.

If I remove the MatchAllDocsQuery  condition (comment whole //1
block), or if I dont use the custom hitcollector (ms.search(mbq);
instead of ms.search(mbq, allcoll);) the exception goes away. By
stepping into the source I can see it seems due to MatchAllDocsQuery
no implementing extractTerms()....
I never looked at lucene internals before, any help as to what
extractTerms() should do, or any other hint to overcome this?

thanks,


            Searcher searcher = new
IndexSearcher("c:\\projects\\mig\\runtime\\index\\01Aug16\\");
            Searchable[] indexes = new IndexSearcher[1];
            indexes[0] = searcher;
            MultiSearcher ms = new MultiSearcher(indexes);

            AllCollector allcoll = new AllCollector(ms);

            BooleanQuery mbq = new BooleanQuery();
            mbq.add(new TermQuery(new Term("body", "value1")),
BooleanClause.Occur.MUST_NOT);
// 1
            MatchAllDocsQuery alld = new MatchAllDocsQuery();
            mbq.add(alld, BooleanClause.Occur.MUST);
//

            System.out.println("Query: " + mbq.toString());

            // 2
            ms.search(mbq, allcoll);
            //ms.search(mbq);

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