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https://issues.apache.org/jira/browse/DERBY-824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785867#action_12785867
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Knut Anders Hatlen commented on DERBY-824:
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I converted this sub-task to a top-level issue since its parent (DERBY-808) was
closed.
> Enhance logic in PredicateList to use variant type of expression while
> determining search clauses or predicates, instead of using ConstantNode or
> ParameterNodes directly.
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-824
> URL: https://issues.apache.org/jira/browse/DERBY-824
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.2.1.6
> Environment: generic
> Reporter: Satheesh Bandaram
> Priority: Minor
>
> Code in PredicateList can be enhanced to use variant type of expressions
> while determining whether a predicate qualifies to be a search clause or not.
> Currently code checks for ConstantNode or ParameterNode directly. It should
> also be possible to enhance this logic to cover constant expressions so that
> predicates like col = upper('ES5') would also be considered as search
> clauses. For a customer query in question, having col='ES5' in the query
> completes the query in about 20 seconds, where as col=upper('ES5') runs for a
> looong time. (more than several hours)
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