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Posted to derby-dev@db.apache.org by "Mamta A. Satoor (JIRA)" <ji...@apache.org> on 2012/10/02 07:19:08 UTC
[jira] [Updated] (DERBY-2678) Derby should follow SQL standards
when operand(s) in the collation operation have collation derivation of
NONE
[ https://issues.apache.org/jira/browse/DERBY-2678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mamta A. Satoor updated DERBY-2678:
-----------------------------------
Urgency: Normal
Labels: derby_triage10_10 (was: )
> 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: Improvement
> Components: SQL
> Affects Versions: 10.3.1.4
> Reporter: Mamta A. Satoor
> Labels: derby_triage10_10
>
> 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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