[DERBY-824] Enhance logic in PredicateList to use variant type of expression while determining search clauses or predicates, instead of using ConstantNode or ParameterNodes directly.

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 10.2.1.6
• Component/s: SQL
• Labels: derby_triage10_11
• Environment: generic
• Urgency: Low
• Assignee: Unassigned
• Reporter: Satheesh E. Bandaram
• Created: 19/Jan/06 04:38
• Updated: 25/Jun/13 15:08

Description

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)

Issue Links

• is part of: DERBY-808 PreparedStatements can take longer to execute than equivalent Statements when there are multiple join conditions mixed with some search clauses.