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From "Pinaki Poddar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-1288) Support alias() on Criteria Query API
Date Thu, 10 Sep 2009 21:12:57 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753819#action_12753819
] 

Pinaki Poddar commented on OPENJPA-1288:
----------------------------------------

After discussion in JPA 2.0 expert group, we reached the consensus that alias() be a mutation
on the same instance rather than creating a new instance.
But an aliased expression can not be aliased again.

> Support alias() on Criteria Query API
> -------------------------------------
>
>                 Key: OPENJPA-1288
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1288
>             Project: OpenJPA
>          Issue Type: New Feature
>          Components: jpa, query
>    Affects Versions: 2.0.0-M3, 2.0.0-M4, 2.0.0
>            Reporter: Pinaki Poddar
>            Assignee: Pinaki Poddar
>             Fix For: 2.0.0-M3, 2.0.0-M4, 2.0.0
>
>
> Selection.alias() according to latest JPA 2.0 creates new instances rather than adding
an alias name to the receiver.
> This apparently simple change can have a relatively large impact, because we maintain
Selection terms keyed by its alias.
> If we go for a delegation pattern to implement alias(), then all Selection derivations
(quite a few of them) are to be delegated. 
> Comments/thoughts?

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