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https://issues.apache.org/jira/browse/LUCENE-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15237203#comment-15237203
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Robert Muir commented on LUCENE-5325:
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is there a way to move out the setScorer method? it seems like this one really
does not belong, e.g. should be at a higher level and this api should just have
the per-document get ? I like David's idea about separate boolean exists (or
simply have method to get the Bits for this at a higher level).
to me that is better, because then its up to the thing using it to determine
how null values should be treated. For example expressions/ could treat them as
NaN rather than 0, maybe that is more intuitive (especially with respect to
sorting).
> 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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