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https://issues.apache.org/jira/browse/DERBY-2678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12497731
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Mamta A. Satoor commented on DERBY-2678:
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Derby 10.3 implements the item number 2) above but item number 1) has not been
tackled yet.
> 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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