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https://issues.apache.org/jira/browse/DERBY-2678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12502623
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Mamta A. Satoor commented on DERBY-2678:
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There are some test cases for 1b) above in CollationTest.java They should all
pass but they do not because we just check if the 2 sides of the collation
operation have same derivation or not and if not, then we throw an exception.
But for the case where one side has collation derivation of NONE and the other
side has IMPLICIT, we should do the collation using the collation type of the
side that has collation derivation of NONE. Once we fix this, the CollationTest
will fail and will need to be fixed. I have added comments in that test
wherever this bug applies. Please fix those comments in the test when you are
fixing this bug. I committed the comments in that test case using revision
545381.
> Derby should follow SQL standards when operand(s) in the collation operation
> have collation derivation of NONE
> --------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-2678
> URL: https://issues.apache.org/jira/browse/DERBY-2678
> Project: Derby
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 10.3.0.0
> Reporter: Mamta A. Satoor
>
> The collation methods in Derby should follow the rules defined by SQL spec in
> Section 9.13 Collation determination Syntax Rules 2 and 3e.
> According to those rules,
> 1)at least one operand shall have a declared type collation (that means if
> the comparison is sysChar1|userChar1 > sysChar2|userChar2, then such a
> comparison will fail because both sides of > operator have collation
> derivation of NONE. But if the comparison is sysChar|userChar1 > sysChar2,
> then it shouldn't fail because although the left hand operand has collation
> derivation of NONE, the right hand operand has collation derivation of
> IMPLICIT and hence the comparison is possible).
> 2)every operand whose collation derivation is IMPLICIT shall have the same
> declared type collation (that means if the comparison is sysChar1 >
> userChar1WithTerritoryBasedCollation, then such a comparison will fail
> because left operand has collation derivation as IMPLICIT and collation type
> as UCS_BASIC and the right operand has collation derivation IMPLICIT and
> collation type as TERRITORY_BASED. But if the comparison is sysChar1 >
> sysChar2, then comparison won't fail because both the operands have same
> collation derivation and type.)
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