Robert Muir created LUCENE-6896:
-----------------------------------
Summary: Fix/document various Similarity bugs around extreme norm
values
Key: LUCENE-6896
URL: https://issues.apache.org/jira/browse/LUCENE-6896
Project: Lucene - Core
Issue Type: Bug
Reporter: Robert Muir
Fix For: 6.0, 5.4
Spinoff from LUCENE-6818:
[~iorixxx] found problems with every Similarity (except ClassicSimilarity) when
trying to test how they behave on every possible norm value, to ensure they are
robust for all index-time boosts.
There are several problems:
1. buggy normalization decode that causes the smallest possible norm value (0)
to be treated as an infinitely long document. These values are intended to be
encoded as non-negative finite values, but going to infinity breaks everything.
2. various problems in the less practical functions that already have
documented warnings that they do bad things for extreme values. These impact
DFR models D, Be, and P and IB distribution SPL.
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