Improve the cost model for user-defined functions
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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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