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https://issues.apache.org/jira/browse/DERBY-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678005#action_12678005
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Aaron Digulla commented on DERBY-4071:
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In this case, I think it's unearthing something. If you look at my example,
then I'm only comparing columns of the same type, so why is Derby comparing
CHAR and VARCHAR internally? This looks like a column mixup.
Or maybe the MAX() casts CHAR to VARCHAR? But why would it do that? Does it
also cast INT to LONG? etc.
> AssertFailure when selecting rows from a table with CHARACTER and VARCHAR
> columns
> ---------------------------------------------------------------------------------
>
> Key: DERBY-4071
> URL: https://issues.apache.org/jira/browse/DERBY-4071
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.4.2.0
> Reporter: Aaron Digulla
> Attachments: DerbyTest.java
>
>
> When running a complex query on this table:
> [code]
> Create table DEMO.TEST (
> CHR CHARACTER(26) ,
> VCHR VARCHAR(25) )
> [code]
> then I get this exception:
> AssertFailure: ASSERT FAILED col1.getClass() (class ...SQLChar) expected to
> be the same as col2.getClass() (class ....SQLVarchar)' was thrown while
> evaluating an expression.
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