RuleCleanCriteria may not be adding in RuleRaiseNull when needed, which can result in invalid nodes under an accessnode. This in turn may manifest itself as:

java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(ArrayList.java:338)
at java.util.ArrayList.get(ArrayList.java:351)
at org.teiid.query.optimizer.relational.rules.RuleCollapseSource.buildQuery(RuleCollapseSource.java:338)
at org.teiid.query.optimizer.relational.rules.RuleCollapseSource.buildQuery(RuleCollapseSource.java:373)
at org.teiid.query.optimizer.relational.rules.RuleCollapseSource.createQuery(RuleCollapseSource.java:228)

As there may not be from clause items to collapse.