Allow for LONG VARCHAR to be compared to LONG VARCHAR
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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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