[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2088) TypeMismatchException on object equality expression from one-to-one relationship

[Gail Badner (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36000#action_36000 ] 

Gail Badner commented on HHH-2088:
----------------------------------

>From Steve Ebersole:

It's "ok".  Given the current APIs, there is not a better solution at any rate.

Looking ahead, a better solution is to add a notion of type (org.hibernate.type.Type) compatibility/comparability.  It's funny because the comparability is largely inconsequential in this particular use case.  Here we are much more interested in the overall number of columns for the type to decide about dialect-proper tuple syntax if necessary.

> TypeMismatchException on object equality expression from one-to-one relationship
> --------------------------------------------------------------------------------
>
>                 Key: HHH-2088
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2088
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.0.cr4
>            Reporter: Salvatore Insalaco
>         Attachments: HHH-2088.patch
>
>
> Suppose to have entity A with a one-to-one constrained relationship to an entity B, called bRel.
> The query: "from A a, B b where a.bRel = b" raises a TypeMismatchException, even if bRel and b are instances of the same entity.
> This happens because in BinaryLogicOperatorNode:
> - lhsType is org.hibernate.type.Type = org.hibernate.type.OneToOneType(B)", with getColumnSpan returning 0.
> - rhsType is org.hibernate.type.Type = org.hibernate.type.ManyToOneType(B)", with getColumnSpan returning 1.
> And it compares the two columnspans.
> It doesn't happen with 3.2.0.cr2.

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