[jira] [Created] (LUCENE-8012) Improve Explanation class

["Robert Muir (JIRA)" <ji...@apache.org>]

Robert Muir created LUCENE-8012:
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             Summary: Improve Explanation class
                 Key: LUCENE-8012
                 URL: https://issues.apache.org/jira/browse/LUCENE-8012
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Robert Muir


Explanation class is currently nice and simple, and float matches the scoring api, but this does not work well for debugging numerical errors of internal calculations (it usually makes practical sense to use 64-bit double to avoid issues).

Also it makes for nasty formatting of integral values such as number of tokens in the collection or even document's length, its just noise to see {{10.0}} there instead of {{10}}, and scientific notation for e.g. number of documents is just annoying. 

One idea is to take Number instead of float? Then you could pass in the correct numeric type (int,long,double,float) for internal calculations, parameters, statistics, etc, and output would look nice.



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