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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2793) Ensure LIKE predicate follows correct rules for determing collation
Date Fri, 08 Jun 2007 16:17:26 GMT
Ensure LIKE predicate follows correct rules for determing collation
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                 Key: DERBY-2793
                 URL: https://issues.apache.org/jira/browse/DERBY-2793
             Project: Derby
          Issue Type: Sub-task
          Components: SQL
            Reporter: Daniel John Debrunner


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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