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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2793) Ensure LIKE predicate follows correct rules for determing collation
Date Tue, 31 Jul 2007 20:52:53 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12516800
] 

Mamta A. Satoor commented on DERBY-2793:
----------------------------------------

Made another svn change to add comment to the new method in DTD. The change went in as 561514

> Ensure LIKE predicate follows correct rules for determing collation
> -------------------------------------------------------------------
>
>                 Key: DERBY-2793
>                 URL: https://issues.apache.org/jira/browse/DERBY-2793
>             Project: Derby
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Daniel John Debrunner
>            Assignee: Mamta A. Satoor
>             Fix For: 10.4.0.0
>
>
> The current code in LikeEscapeOperatorNode seems to only check that the collations are
identical. That is not the correct mechanism for determing collation which is based upon SQL
spec Section 9.13 "Collation determination" or item 12 in the DERBY-1478 wiki page.
> http://wiki.apache.org/db-derby/BuiltInLanguageBasedOrderingDERBY-1478
> I think it's also essential that the (somewhat complex) logic to implement collation
determination is in a single method, not repeated multiple times for each collation.
> There is a TODO in LikeEscapeOperatorNode  that might be related to this.

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