[jira] Created: (CAY-1025) Do something about to-many prefetch limitations

From: Andrus Adamchik (JIRA) ("Andrus)
Date: Tue Apr 08 2008 - 14:11:39 EDT

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    Do something about to-many prefetch limitations
    -----------------------------------------------

                     Key: CAY-1025
                     URL: https://issues.apache.org/cayenne/browse/CAY-1025
                 Project: Cayenne
              Issue Type: Improvement
              Components: Cayenne Core Library
        Affects Versions: 1.2 [STABLE], 2.0 [STABLE], 3.0
                Reporter: Andrus Adamchik
                Assignee: Andrus Adamchik
                 Fix For: 3.0

    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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