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https://issues.apache.org/jira/browse/LUCENE-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated LUCENE-5325:
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Attachment: LUCENE-5325.patch
Patch.
To keep it simple, I've just added DoubleValues / DoubleValuesSource, and cut
over the expressions module to use it. Still needs some work:
- the ValueSource.toDoubleValuesSource() method needs a test
- I'm not quite sure how to deal with exceptions throw by Scorer.score() in
DoubleValuesSource.SCORES
- I've copied the exists() method from FunctionValues to DoubleValues, but I'm
not convinced we need it. The expressions module doesn't actually use it, at
any rate, but in some cases I can see it's useful to distinguish between a
zero-value and a non-existent value. Maybe I should remove it here, and it can
be added in later if it's needed for a specific function?
- DoubleValues is an abstract class rather than an interface, simply because I
couldn't get the ASM stuff in JavascriptCompiler to work with interfaces.
> Move ValueSource and FunctionValues under core/
> -----------------------------------------------
>
> Key: LUCENE-5325
> URL: https://issues.apache.org/jira/browse/LUCENE-5325
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Shai Erera
> Attachments: LUCENE-5325.patch
>
>
> Spinoff from LUCENE-5298: ValueSource and FunctionValues are abstract APIs
> which exist under the queries/ module. That causes any module which wants to
> depend on these APIs (but not necessarily on any of their actual
> implementations!), to depend on the queries/ module. If we move these APIs
> under core/, we can eliminate these dependencies and add some mock impls for
> testing purposes.
> Quoting Robert from LUCENE-5298:
> {quote}
> we should eliminate the suggest/ dependencies on expressions and queries, the
> expressions/ on queries, the grouping/ dependency on queries, the spatial/
> dependency on queries, its a mess.
> {quote}
> To add to that list, facet/ should not depend on queries too.
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