[teiid-issues] [JBoss JIRA] (TEIID-5395) Improvement of JPA translator join behavior

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-5395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13599170#comment-13599170 ] 

Steven Hawkins commented on TEIID-5395:
---------------------------------------

Thinking about it more, it seems like fully recreating the relational structure should not be the goal, just to make a best effort at representing the entity structure.  So we'll leave things as not exposing many-to-many relationships and unidirectional collections.

> Improvement of JPA translator join behavior
> -------------------------------------------
>
>                 Key: TEIID-5395
>                 URL: https://issues.jboss.org/browse/TEIID-5395
>             Project: Teiid
>          Issue Type: Bug
>          Components: Misc. Connectors
>    Affects Versions: 10.2.1
>            Reporter: Harold Campbell
>            Assignee: Steven Hawkins
>             Fix For: 11.0
>
>
> The behavior of the JPA connector has a number of issues regarding entity relationships.
> * Implicit joins (those needed to get child entity id's) are made INNER JOINS, preventing getting any rows where the value would be null.
> * Something odd is done with *ToMany relationships which blows up the size of resultsets.
> * If a parent entity and a child entity use the same name for their id property, only one gets mapped.
> * It's not possible to join the same entity more than once.



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