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https://issues.apache.org/jira/browse/DERBY-4612?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mamta A. Satoor updated DERBY-4612:
-----------------------------------
Urgency: Normal
Labels: derby_triage10_10 (was: )
> 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
> Labels: derby_triage10_10
>
> 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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