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From Phanindra R <>
Subject Weird scenario: Score 'explain' description showing different doc id
Date Fri, 27 Jul 2012 22:56:52 GMT
      This is the first time I am encountering this kind of scenario. Lack
of knowledge might be the reason for my surprise.

- I am using myIndexWriter.explain(Query q, int docId).

- For the same query, the explanation for most of the docs is exactly what
it's supposed to be. However, for some docId, the explanation is showing a
different doc id. That doc id doesn't even have the passed in query term.
The following is the output.

Explaining: Doc id: *73714*, Query: MY_FIELD:bike

60.828213 = (MATCH) fieldWeight(MY_FIELD:bike in *22973*), product of:
  1.7320508 = tf(termFreq(MY_FIELD:bike)=3)
  70.23837 = idf(docFreq=272, maxDocs=438145)
  0.5 = fieldNorm(field=MY_FIELD, doc=*22973*)

You may notice that the underlined doc ids are different from each other.
The "same" code is working perfectly fine for other document ids.

Here is the code snippet, just in case.

    private void explainQuery(Query q, int doc) throws IOException {
        System.out.println("Explaining: " + doc + ", Query: " + q );
        Explanation exp = is.explain(q, doc);

I am not able to figure out the reason behind it.


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