Hoss Man created LUCENE-5961:
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Summary: FunctionValues.exist(int) isn't returning false in cases
where it should for many "math" based value sources
Key: LUCENE-5961
URL: https://issues.apache.org/jira/browse/LUCENE-5961
Project: Lucene - Core
Issue Type: Bug
Reporter: Hoss Man
The FunctionValues class contains an exist(int doc) method with a default
implementation that returns true - field based DocValues override this method
as appropriate, but most of the "function" based subclasses in the code
(typically anonymous subclasses of "FloatDocValues") don't override this method
when wrapping other ValueSources.
So for example: the FunctionValues returned by ProductFloatFunction.getValues()
will say that a value exists for any doc, even if that ProductFloatFunction
wraps two FloatFieldSources that don't exist for any docs
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