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https://issues.apache.org/jira/browse/LUCENE-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15235835#comment-15235835
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Hoss Man commented on LUCENE-5325:
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bq. One of the issues I have with ValueSource is that it's inherently
type-unsafe - you have no way of saying what sort of value you want from a
ValueSource input.
This comment reminded me of a discussion I remember having a long time ago that
i started typing up a summary of in case it inspires folks, but then realized I
already filed as SOLR-6575 the last time someone mentioned something that
reminded me of it.
Might be some helpful ideas there if folks are looking to revamp & improve the
type specificity of the ValueSource APIs
> 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
>
> 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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