Simplify JPQL SUBSTRING clauses involving literal index and position data
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                 Key: OPENJPA-488
                 URL: https://issues.apache.org/jira/browse/OPENJPA-488
             Project: OpenJPA
          Issue Type: Improvement
          Components: sql
    Affects Versions: 1.0.1, 1.0.0, 0.9.7, 0.9.6, 0.9.0, 1.0.2
            Reporter: Patrick Linskey
             Fix For: 1.1.0


The special case of SUBSTRING expressions that use literals for both start 
index and length can be optimized independently of the general case.

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