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https://issues.apache.org/jira/browse/CAY-1210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702266#action_12702266
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Ari Maniatis commented on CAY-1210:
-----------------------------------
>From a conversation with Andrus, the following problem was identified: users
>using non-default collations *_bin or *_cs will have their behaviour changed
>by this change
As it seems that any solution here is going to be a compromise, I guess it has
to be implemented as a flag in MySQLAdapter that defines one or the other
strategy. AutoAdapter can set this flag based on the database default collation:
==> show variables like "collation_database";
If a user needs different behavior, they will have to set it manually per
adapter.
Alternatively, Cayenne modeler will need to be taught about collations so they
can be stored against the dbcolumn. I don't think this is a MySQL specific
problem, since collation affects the behaviour of other databases. It is just
that MySQL doesn't give us a workaround with being able to create a functional
index on UPPER(name).
For what it is worth, we have this identical problem in WebObjects and need to
find a similar fix there.
> mysql does not use index for case insensitive searches
> ------------------------------------------------------
>
> Key: CAY-1210
> URL: https://issues.apache.org/jira/browse/CAY-1210
> Project: Cayenne
> Issue Type: Improvement
> Reporter: Ari Maniatis
> Assignee: Ari Maniatis
> Fix For: 3.0
>
>
> When performing a case insensitive search Cayenne spits out SQL which looks
> like this
> SELECT .... WHERE upper(name) LIKE upper("fred")
> This prevents any index being used for the search. Since mysql already
> performed case insensitive searches on text fields we need to suppress the
> 'upper' functions being used in these situations. All searches on these
> fields are already case insensitive.
> http://dev.mysql.com/doc/refman/5.0/en/case-sensitivity.html
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