Allow datastore function as query expression
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Key: OPENJPA-1195
URL: https://issues.apache.org/jira/browse/OPENJPA-1195
Project: OpenJPA
Issue Type: New Feature
Reporter: Pinaki Poddar
Assignee: Pinaki Poddar
Create a query expression that uses a datastore function such as MOD(..) or
MAX(..) in a generic fashion.
This is required by function() support for CriteriaQuery and adds a generic
capability for queries so we can query something like
"select CURRENT_USER(), x.name FROM Person x WHERE LENGTH(x.name)>10 ORDER
BY LENGTH(x.name)"
Notice that JPQL Parser may not like the syntax -- but CriteriaQuery will allow
such possibility.
Allow the function() to accept 0 or more arguments as expressions.
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