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j : java-dev@lucene.apache.org 11 September 2009 • 7:41AM -0400

[jira] Created: (LUCENE-1907) sumOfSquared weights should be calculated as part of queryNorm
by Mark Miller (JIRA)

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sumOfSquared weights should be calculated as part of queryNorm
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                 Key: LUCENE-1907
                 URL: https://issues.apache.org/jira/browse/LUCENE-1907
             Project: Lucene - Java
          Issue Type: Bug
            Reporter: Mark Miller
            Priority: Minor


see the related issue for comments.

its a bummer - doesn't look like we have time to address this, but its the best release for it - back compat requires the reflection stuff that Similarity already has (and we hope to remove next release). It would suck to have to hold onto it - so it seems unlikely we will do this at a later time.

The idea is that the sumOfSquaredWeights computation should be specific to the queryNorm impl - so the queryNorm should accept the Weight instead, and if its using the euclidean distance formula, it can do the sumOfSquared calculations - but if its doing another normalization, these can be skipped (in each termweight, booleanweight, etc). Right now you pay for sumOfSquared no matter what, and the logic separation is a little off.

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