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From "Andrus Adamchik (JIRA)" <j...@apache.org>
Subject [jira] Closed: (CAY-1025) Do something about to-many prefetch limitations
Date Mon, 07 Sep 2009 23:32:58 GMT

     [ https://issues.apache.org/jira/browse/CAY-1025?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrus Adamchik closed CAY-1025.
--------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: Short term future)
                   3.0 beta 1

> Do something about to-many prefetch limitations
> -----------------------------------------------
>
>                 Key: CAY-1025
>                 URL: https://issues.apache.org/jira/browse/CAY-1025
>             Project: Cayenne
>          Issue Type: Improvement
>          Components: Cayenne Core Library
>    Affects Versions: 1.2 branch, 2.0 branch, 3.0
>            Reporter: Andrus Adamchik
>            Assignee: Andrus Adamchik
>             Fix For: 3.0 beta 1
>
>
> http://cayenne.apache.org/doc/prefetching.html
> "PREFETCH LIMITATION: To-many relationships should not be prefetched if a query qualifier
can potentially reduce a number of related objects, resulting in incorrect relationship list."
> This can bite an unsuspecting user... So we either 
> 1. Address the core limitation by building a correct prefetch query (use subselect?)
> 2. Detect these cases and throw an exception
> 3. Detect these cases and silently drop a prefetch
> I should note that debugging these problems is very hard, as they look totally random
until you get to the cause.

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