Kai Chan created LUCENE-5315:
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Summary: Some subclasses of Scorer do not honor the contract of
DocsEnum.freq()
Key: LUCENE-5315
URL: https://issues.apache.org/jira/browse/LUCENE-5315
Project: Lucene - Core
Issue Type: Bug
Components: core/query/scoring
Affects Versions: 4.5.1
Reporter: Kai Chan
The behavior of Scorer.freq() is inconsistent across its subclasses:
* For TermScorer, the freq() method behaves just as DocsEnum.freq() specifies,
i.e. the method returns the "term frequency in the current document".
* For BooleanScorer2, ConjunctionScorer, DisjunctionMaxScorer,
DisjunctionSumScorer, and possibly other classes, the freq() method returns the
number of clauses (in BooleanQuery or DisjunctionMaxQuery) that match the
current document.
This difference makes the meaning of Scorer.freq()'s return value uncertain. To
add to the uncertainty, given a Query, there seems to be no way of knowing
which behavior takes effect (as that is not specified in the API reference)
except by reading or running the code.
This issue might be related to LUCENE-4514.
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