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From "Andrus Adamchik (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CAY-1979) Prefetches on Many-to-Many Relationships with Longvarchar
Date Mon, 15 Dec 2014 07:27:13 GMT

     [ https://issues.apache.org/jira/browse/CAY-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrus Adamchik reassigned CAY-1979:
------------------------------------

    Assignee: Andrus Adamchik

> Prefetches on Many-to-Many Relationships with Longvarchar
> ---------------------------------------------------------
>
>                 Key: CAY-1979
>                 URL: https://issues.apache.org/jira/browse/CAY-1979
>             Project: Cayenne
>          Issue Type: Bug
>          Components: Core Library
>    Affects Versions: 3.1
>            Reporter: Trevor Higgins
>            Assignee: Andrus Adamchik
>            Priority: Critical
>
> Discovered when performing a prefetch on a many-to-many relationship involving a jump
table, but may affect a varietey of prefetches.
> (Note: this is a 'disjoint' prefetch, as selected by Cayenne not by the calling code)
> When performing a prefetch SelectAction.performAction checks 'translator.isSuppressingDistinct()'
and if so wraps the resultset iterator in a DistinctResultIterator.
> The problem arises because when the unsupported distinct type is detected in the target
table SelectTranslator sets 'suppressingDistinct' to true and DistinctResultIterator does
NOT use full row comparisons (alternatively it could also use the PKs from both sides of the
arc but that currently isn't implemented).
> This causes only the first row that a foreign pk appears in to be used and the rest discarded,
resulting in some to most of the relationships not being represented in the object model.
> Expected behavior is for all arcs to show up in the object model regardless of the column
types.



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