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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2910) SimpleStringOperatorNode in it's bindExpression method generates a character string CAST if required but does not set the correct collation.
Date Tue, 28 Aug 2007 15:25:30 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12523258
] 

Kathey Marsden commented on DERBY-2910:
---------------------------------------

I am having trouble finding any explicit reference to the collation of implicit casts.  The
SQL Spec in section 6.1.2 says of explicit casts:

"10) If TD is a fixed-length, variable-length, or large object character string, then TD shall
not specify <collate
clause>. The declared type collation of the <cast specification> is the character
set collation of the character
set of TD and its collation derivation is implicit."


I think that given no explicit rules for implicit casts, that they should follow the same
rules as explicit casts. Does that sound reasonable?

Kathey
 



> SimpleStringOperatorNode in it's bindExpression method generates a character string CAST
if required but does not set the correct collation.
> --------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2910
>                 URL: https://issues.apache.org/jira/browse/DERBY-2910
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.3.1.4, 10.4.0.0
>            Reporter: Mamta A. Satoor
>            Assignee: Kathey Marsden
>         Attachments: derby-2910_diff.txt, derby-2910_stat.txt
>
>
> Following query should run into error if run in a territory based database 
> SELECT TABLENAME FROM SYS.SYSTABLES WHERE UPPER(CURRENT_DATE) = TABLENAME;
> When a CAST node is generated on top of CURRENT_DATE to create a character string type,
we do not set the collation of that character string type and hence it always ends up getting
the default which is collation derivation IMPLICIT and collation type UCS_BASIC. That does
not sound right. 
> There might be other places where we generate CAST node to create a character string
type. We should check if the collation is set correctly for them.

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