SimilarityDelegator broke back-compat for subclasses overriding lengthNorm
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Key: LUCENE-2828
URL: https://issues.apache.org/jira/browse/LUCENE-2828
Project: Lucene - Java
Issue Type: Bug
Affects Versions: 3.0.3, 3.0.2, 3.0.1, 3.0, 2.9.4, 2.9.3, 2.9.2, 2.9.1, 2.9
Reporter: Michael McCandless
In LUCENE-1420, we added Similarity.computeNorm to let the norm computation
have access to the raw information (length, boost, etc.).
But this class broke back compat with SimilarityDelegator. We did add
computeNorm there, but, it's impl just forwards to the delegee's computeNorm.
In the case where a subclass of SimilarityDelegator overrides lengthNorm, that
method will no longer be invoked.
Not quite sure how to fix this since, somehow, we have to determine whether the
delegee's impl of computeNorm should be favored over the subclasses impl of the
"legacy" lengthNorm.
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