Ensure comparisons do not contain two parameters with Derby (ie SELECT ... WHERE ? = ?)
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                 Key: OPENJPA-1217
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1217
             Project: OpenJPA
          Issue Type: Bug
          Components: jdbc
         Environment: Derby Embedded
            Reporter: Michael Dick


The problem appears to be Derby specific and can be seen by running o.a.o.p.c.TestTypesafeCriteria.testTrue() and testFalse(). 

It's not related to criteria - the problem exists in the JPQL query. I believe I've seen this issue before but couldn't find it in JIRA. The relevant stack traces follow: 

Caused by: <openjpa-2.0.0-SNAPSHOT-r422266:799520 nonfatal general error> org.apache.openjpa.persistence.PersistenceException: It is not allowed for both operands of '=' to be ? parameters. {SELECT t0.id, t0.DTYPE, t0.name FROM CR_PSN t0 WHERE (? = ?)} [code=30000, state=42X35]
	at org.apache.openjpa.jdbc.sql.DBDictionary.narrow(DBDictionary.java:4554)
	at org.apache.openjpa.jdbc.sql.DBDictionary.newStoreException(DBDictionary.java:4507)
	at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:102)
	at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:88)
	at org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:64)
	at org.apache.openjpa.jdbc.kernel.SelectResultObjectProvider.handleCheckedException(SelectResultObjectProvider.java:155)
	at org.apache.openjpa.lib.rop.EagerResultList.<init>(EagerResultList.java:40)
	at org.apache.openjpa.kernel.QueryImpl.toResult(QueryImpl.java:1232)
	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:993)
	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:849)
	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:780)
	at org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:525)
	at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:287)
	at org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:299)
	at org.apache.openjpa.persistence.criteria.CriteriaTest.executeQueryAndCollectSQL(CriteriaTest.java:379)
	... 23 more
Caused by: org.apache.openjpa.lib.jdbc.ReportingSQLException: It is not allowed for both operands of '=' to be ? parameters. {SELECT t0.id, t0.DTYPE, t0.name FROM CR_PSN t0 WHERE (? = ?)} [code=30000, state=42X35]
	at org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.wrap(LoggingConnectionDecorator.java:245)
	at org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator.access$000(LoggingConnectionDecorator.java:69)
	at org.apache.openjpa.lib.jdbc.LoggingConnectionDecorator$LoggingConnection.prepareStatement(LoggingConnectionDecorator.java:279)
	at org.apache.openjpa.lib.jdbc.DelegatingConnection.prepareStatement(DelegatingConnection.java:188)
	at org.apache.openjpa.lib.jdbc.ConfiguringConnectionDecorator$ConfiguringConnection.prepareStatement(ConfiguringConnectionDecorator.java:156)
	at org.apache.openjpa.lib.jdbc.DelegatingConnection.prepareStatement(DelegatingConnection.java:188)
	at org.apache.openjpa.jdbc.kernel.JDBCStoreManager$RefCountConnection.prepareStatement(JDBCStoreManager.java:1519)
	at org.apache.openjpa.lib.jdbc.DelegatingConnection.prepareStatement(DelegatingConnection.java:177)
	at org.apache.openjpa.jdbc.sql.SQLBuffer.prepareStatement(SQLBuffer.java:530)
	at org.apache.openjpa.jdbc.sql.SQLBuffer.prepareStatement(SQLBuffer.java:510)
	at org.apache.openjpa.jdbc.sql.SelectImpl.prepareStatement(SelectImpl.java:450)
	at org.apache.openjpa.jdbc.sql.SelectImpl.execute(SelectImpl.java:391)
	at org.apache.openjpa.jdbc.sql.SelectImpl.execute(SelectImpl.java:363)
	at org.apache.openjpa.jdbc.sql.LogicalUnion$UnionSelect.execute(LogicalUnion.java:427)
	at org.apache.openjpa.jdbc.sql.LogicalUnion.execute(LogicalUnion.java:230)
	at org.apache.openjpa.jdbc.sql.LogicalUnion.execute(LogicalUnion.java:220)
	at org.apache.openjpa.jdbc.kernel.SelectResultObjectProvider.open(SelectResultObjectProvider.java:94)
	at org.apache.openjpa.lib.rop.EagerResultList.<init>(EagerResultList.java:34)
	... 31 more


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