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From "Lukas Eder (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-5130) Allow for LONG VARCHAR to be compared to LONG VARCHAR
Date Tue, 15 Mar 2011 18:11:38 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13007057#comment-13007057
] 

Lukas Eder commented on DERBY-5130:
-----------------------------------

Hmm, you're right. I agree that it is consistent with the idea of ordering contexts... I guess
you can reject this issue.

> Allow for LONG VARCHAR to be compared to LONG VARCHAR
> -----------------------------------------------------
>
>                 Key: DERBY-5130
>                 URL: https://issues.apache.org/jira/browse/DERBY-5130
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.7.1.1
>            Reporter: Lukas Eder
>            Priority: Minor
>              Labels: comparison, derby_triage10_8, sql, typesystem
>
> Interestingly, this is not possible:
>   select 1 from SYSIBM.SYSDUMMY1 where cast('2' as long varchar) = cast('2' as long varchar)
> Whereas these statements are executable:
>   select 1 from SYSIBM.SYSDUMMY1 where '2' = '2'
>   select 1 from SYSIBM.SYSDUMMY1 where cast(cast('2' as long varchar) as varchar(1))
= cast(cast('2' as long varchar) as varchar(1))
> According to the documentation that is the correct behaviour:
> http://db.apache.org/derby/docs/10.7/ref/rrefsqlj58560.html
> Nevertheless, if casting is possible between LONG VARCHAR and VARCHAR, and assignment
too, then I don't understand why LONG VARCHAR cannot even be compared to LONG VARCHAR
> Note: A similar issue has been open for a long time:
> https://issues.apache.org/jira/browse/DERBY-342

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