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Date: Thu, 15 Oct 2009 08:08:31 -0700 (PDT)
From: "B.J. Reed (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
Subject: [jira] Updated: (OPENJPA-1308) shouldn't always use CAST with UPPER
 and LOWER for DB2
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     [ https://issues.apache.org/jira/browse/OPENJPA-1308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

B.J. Reed updated OPENJPA-1308:
-------------------------------

    Attachment: OPENJPA-1308-trunk.patch
                OPENJPA-1308-1.2.x.patch
                OPENJPA-1308-1.0.x.patch

Attached patches to be considered for inclusion to OpenJPA.  No real differences in the patches except that the 1.0.x patch includes a new test case that wasn't already present in 1.0.x (the other 2 just modify the existing test case).

For the most part, the change is that when UPPER or LOWER are used, DB2Dictionary looks to see what the database column is defined as before doing the cast.  In this way, if the column is already a VARCHAR, then indexes would still be used since no cast would be generated.

> shouldn't always use CAST with UPPER and LOWER for DB2
> ------------------------------------------------------
>
>                 Key: OPENJPA-1308
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1308
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: sql
>    Affects Versions: 1.0.3, 1.2.1, 2.0.0-M2
>         Environment: DB2
>            Reporter: B.J. Reed
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: OPENJPA-1308-1.0.x.patch, OPENJPA-1308-1.2.x.patch, OPENJPA-1308-trunk.patch
>
>
> Using DB2, when a user uses the UPPER or LOWER function, the field is automatically CAST to a varchar.  It would be nice if OpenJPA were a little smarter and only used CAST when necessary.  Using the CAST causes any indexes not to be used so performance won't be what it should.
> I saw some other DB2 functions that also are always CAST, so we may need to improve these also.

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