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From "Lukas Eder (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-5130) Allow for LONG VARCHAR to be compared to LONG VARCHAR
Date Sat, 12 Mar 2011 17:18:06 GMT
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


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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