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Rick Hillegas commented on DERBY-5728: -------------------------------------- Hi Bernard. Can you help me understand what the JPQL query is trying to achieve? What does it mean? Thanks. > Add Support for NULL IS NULL > ---------------------------- > > Key: DERBY-5728 > URL: https://issues.apache.org/jira/browse/DERBY-5728 > Project: Derby > Issue Type: Improvement > Components: SQL > Affects Versions: 10.8.2.2 > Environment: Windows XP > java version "1.6.0_31" > Java(TM) SE Runtime Environment (build 1.6.0_31-b05) > Java HotSpot(TM) Client VM (build 20.6-b01, mixed mode, sharing) > Reporter: bernard > Priority: Critical > Labels: derby_triage10_10 > Attachments: NullParameterEclipseLinkDerbyMaven.zip, > NullParameterHibernateDerbyMaven.zip > > > The following query fails: > SELECT ID FROM CUSTOMER WHERE ((NULL IS NULL) OR (NAME = NULL)) > Why this is an issue? > At least two major Java ORMs, Hibernate JPA and EclipseLink JPA have isues > with generating SQL for trivial JPQL queries such as: > select object(c) from Customer c where ((name: is null) or (c.name = name:)) > where name: is a parameter > For why this is a fundamental issue, please see a minimalistic JPQL query at > http://en.wikipedia.org/wiki/Java_Persistence_Query_Language#Examples > Part of this has already been resolved by issue "Add support for > setObject(<arg>, null)" > https://issues.apache.org/jira/browse/DERBY-1938 > Please see EclipseLink and Hibernate test cases for verification. -- This message was sent by Atlassian JIRA (v7.6.14#76016)