[jira] [Commented] (UIMA-5846) Order in SelectFS

["Marshall Schor (JIRA)" <de...@uima.apache.org>]

    [ https://issues.apache.org/jira/browse/UIMA-5846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16556207#comment-16556207 ] 

Marshall Schor commented on UIMA-5846:
--------------------------------------

This is probably a mistake on my part when I was copying this from uimaFIT impl of "selectBetween" - in thinking that the order would be backwards if the operands were reversed.  I'll change this per your suggestion, to just switch the endpoints, without reversing the direction.

> Order in SelectFS
> -----------------
>
>                 Key: UIMA-5846
>                 URL: https://issues.apache.org/jira/browse/UIMA-5846
>             Project: UIMA
>          Issue Type: Question
>          Components: Core Java Framework
>    Affects Versions: 3.0.0SDK
>            Reporter: Richard Eckart de Castilho
>            Priority: Minor
>
> I'm not sure about the way that order in SelectFS is handled. Naively, I would expect that all operations return annotations in index order or in reverse index order if `backwards` was called. But for example `jcas.select(Sentence.class).between(t1, t2).asList()` returns in normal order if `t1 < t2` and in backwards order if `t2 < t1`. While I this seems to be a nice touch from the engineering point of view, from a naive user's perspective, it seems somewhat surprising to me. Mind that the behavior is documented - still I wonder it if is a good idea. If I wanted to have the annotations in reverse order, I'd probably try calling `jcas.select(Sentence.class).backwards().between(t1, t2).asList()` or maybe `jcas.select(Sentence.class).between(t1, t2).backwards().asList()`.



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