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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 Wed, 01 Aug 2007 05:45:53 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12516872
] 

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

Clarified the comments some more (revision 561668 in main) for the method added in DTD as
part of revision 561494. The commit comments for this most recent checkin is as follows

DERBY-2793

Another commit for comments involved with DTD.compareCollationInfo method. Derby's behavior
is a subset of SQL standard when it comes to comparability rules involving collation derivation
of IMPLICIT and collation derivation of NONE. The additional comments for the method explains
that.


> 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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