0.03125 = fieldNorm(field=pub_date, doc=90992) 1.0 = fieldNorm(field=pub_date, doc=90970)
It looks like the fieldNorm's are what differ, not the IDFs. These are the product of the document and/or field boost, and 1/sqrt(numTerms) where numTerms is the number of terms in the "pub_date" field of the document. Thus if each document is only assigned one date, and you didn't boost the field or the document when you indexed it, this should be 1.0. But if the document has two dates, then this would be 1/sqrt(2). Or if you boosted this document pub_date field, then this will have whatever boost you provided.
So, did you boost anything when indexing? Or could a single document have two or more different values for pub_date? Either would explain this.
Doug
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