JDOQL : Support compilation of ":param.collField.contains()" for (implicit) named parameters

[andyjefferson]

If we want to do something like

SELECT FROM MyClass WHERE :myObj.someField.contains(this.field)

and then try to compile it, we get a message like

org.datanucleus.store.rdbms.sql.expression.IllegalExpressionOperationException: Cannot perform operation ".contains" on org.datanucleus.store.rdbms.sql.expression.NullLiteral@2ea41516 at org.datanucleus.store.rdbms.sql.expression.SQLExpression.invoke(SQLExpression.java:601) at org.datanucleus.store.rdbms.query.QueryToSQLMapper.processInvokeExpression(QueryToSQLMapper.java:3585) at org.datanucleus.query.evaluator.AbstractExpressionEvaluator.compilePrimaryExpression(AbstractExpressionEvaluator.java:213) at org.datanucleus.query.evaluator.AbstractExpressionEvaluator.compileUnaryExpression(AbstractExpressionEvaluator.java:182) at org.datanucleus.query.evaluator.AbstractExpressionEvaluator.compileAdditiveMultiplicativeExpression(AbstractExpressionEvaluator.java:161) at org.datanucleus.query.evaluator.AbstractExpressionEvaluator.compileRelationalExpression(AbstractExpressionEvaluator.java:136) at org.datanucleus.query.evaluator.AbstractExpressionEvaluator.compileOrAndExpression(AbstractExpressionEvaluator.java:78) at org.datanucleus.query.evaluator.AbstractExpressionEvaluator.evaluate(AbstractExpressionEvaluator.java:46) at org.datanucleus.query.expression.Expression.evaluate(Expression.java:338) at org.datanucleus.store.rdbms.query.QueryToSQLMapper.compileFilter(QueryToSQLMapper.java:495) at org.datanucleus.store.rdbms.query.QueryToSQLMapper.compile(QueryToSQLMapper.java:416) at org.datanucleus.store.rdbms.query.JDOQLQuery.compileQueryFull(JDOQLQuery.java:918) at org.datanucleus.store.rdbms.query.JDOQLQuery.compileInternal(JDOQLQuery.java:344) at org.datanucleus.store.query.Query.compile(Query.java:1669)

This is because the parameter doesn't have a value at the point of compilation, hence you have the equivalent of an NPE but in a query. Need a better way of handling this