Peter Keegan writes:
> What is the returned order for documents with identical scores?
have a look at the source of the lessThan method in 
org.java.lucene.search.HitQueue:

protected final boolean lessThan(Object a, Object b) {
    ScoreDoc hitA = (ScoreDoc)a;
    ScoreDoc hitB = (ScoreDoc)b;
    if (hitA.score == hitB.score)
      return hitA.doc > hitB.doc; 
    else
      return hitA.score < hitB.score;
}

sorting is done by this method.

HTH
        Morus

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