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https://issues.apache.org/jira/browse/UIMA-5115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15506567#comment-15506567
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Marshall Schor commented on UIMA-5115:
--------------------------------------

I was thinking of selectCovered.  The question I was posing arises in the case 
where the type of the bounding FS is a subtype of the index type being 
iterated, just opposite to your example.

For instance:  selectCovered(Sentence.type, aVeryWideToken), where someone has 
(for reasons unknown) constructed a "Token" covering multiple sentences.  Here 
the question is, do you return items of Sentence and its subtypes, or Token and 
its subtypes?

I think the answer is you return Sentence and subtypes; that is, there's no 
additional type filtering based on the type of the bounding FS (again, because 
it's not needed - if only tokens are wanted, that's more directly expressible 
using Token.class as the first argument).

> uv3 select() api for iterators and streams over CAS contents
> ------------------------------------------------------------
>
>                 Key: UIMA-5115
>                 URL: https://issues.apache.org/jira/browse/UIMA-5115
>             Project: UIMA
>          Issue Type: New Feature
>          Components: Core Java Framework
>            Reporter: Marshall Schor
>            Priority: Minor
>             Fix For: 3.0.0SDKexp
>
>
> Design and implement a select() API based on uimaFIT's select, integrated 
> well with Java 8 concepts.  Initial discussions in UIMA-1524.  Wiki with 
> diagram: https://cwiki.apache.org/confluence/display/UIMA/UV3+Iterator+support



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