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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4612) Improve the cost model for user-defined functions
Date Mon, 12 Apr 2010 16:49:49 GMT
Improve the cost model for user-defined functions

                 Key: DERBY-4612
                 URL: https://issues.apache.org/jira/browse/DERBY-4612
             Project: Derby
          Issue Type: Improvement
          Components: SQL
            Reporter: Rick Hillegas

Right now the optimizer assumes that user-defined functions are expensive to run. For this
reason, the optimizer avoids pushing function invocations far down in the query plan. It would
be good to give function designers the ability to override the default cost model so that
the optimizer can create more efficient plans for queries which invoke user-defined functions.

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