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https://issues.apache.org/jira/browse/LUCENE-446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doron Cohen updated LUCENE-446:
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Attachment: function.patch.txt
Attached function.patch.txt adds three new queries:
1. ValueSourceQuery - an Expert type of query, more or less same as
in original patch. It is very flexible - takes a ValueSource as input - so
it
could be extended to do additional things (ie not only indexed fields).
2. FieldScoreQuery - subclass of ValueSourceQuery. It is easier
to use, and operates on cached indexed field. A doc score is set
by the value of that field. There are 4 field parser types for this: float,
int,
short, and byte. They require different size in RAM when cached: 8, 4, 2,
and 1 bytes respectively per document. The cache was modified to
accommodate this. (Seems worth to save RAM where possible.)
3. CustomScoreQuery - this query allows to custom the score of its contained
sub-query by implementing a customScore() function. Any computation is
possible, as long as it is based on the original score of the sub-query,
the (optional) score of an (optional) sub-valueSourceQuery, and the docid.
This query also covers (somewhat differently) LUCENE-850
The patch Included tests and javadocs.
All tests pass.
I will later put the javadocs somewhere, to allow commenting on the API without
applying the patch.
The tests found quite a few bugs for me, and I hope I got the scorers and
weight
correct now - I would very much appreciate review comments on these delicate
parts.,,
> FunctionQuery - score based on field value
> ------------------------------------------
>
> Key: LUCENE-446
> URL: https://issues.apache.org/jira/browse/LUCENE-446
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Affects Versions: 1.9
> Reporter: Yonik Seeley
> Assigned To: Doron Cohen
> Attachments: function.patch.txt, function.zip, function.zip
>
>
> FunctionQuery can return a score based on a field's value or on it's ordinal
> value.
> FunctionFactory subclasses define the details of the function. There is
> currently a LinearFloatFunction (a line specified by slope and intercept).
> Field values are typically obtained from FieldValueSourceFactory.
> Implementations include FloatFieldSource, IntFieldSource, and OrdFieldSource.
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