Enhance logic in PredicateList to use variant type of expression while
determining search clauses or predicates, instead of using ConstantNode or
ParameterNodes directly.
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Key: DERBY-824
URL: http://issues.apache.org/jira/browse/DERBY-824
Project: Derby
Type: Sub-task
Versions: 10.2.0.0
Environment: generic
Reporter: Satheesh Bandaram
Priority: Minor
Fix For: 10.2.0.0
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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