Joining two virtual tables that wrap DV SYS views results in ASSERTION FAILED

Issue

• When joining together 2 virtual tables that virtualize Teiid SYS tables (Columns, Tables, and Properties), although the data comes back from each half of those joins, seperately, as not null, the query errors with ASSERTION FAILED exception:

15:28:55,188 ERROR [org.teiid.PROCESSOR] (Worker6_QueryProcessorQueue45) kcayzLVMEpN7 TEIID30019 Unexpected exception for request kcayzLVMEpN7.0: java.lang.AssertionError: ASSERTION FAILED: expected reference to be not null
    at org.teiid.core.util.Assertion.failed(Assertion.java:73) [teiid-common-core-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.core.util.Assertion.isNotNull(Assertion.java:100) [teiid-common-core-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.core.util.Assertion.isNotNull(Assertion.java:92) [teiid-common-core-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.query.processor.relational.RelationalNode.getProjectionIndexes(RelationalNode.java:365) [teiid-engine-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.query.tempdata.TempTable$QueryTupleSource.<init>(TempTable.java:178) [teiid-engine-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.query.tempdata.TempTable$QueryTupleSource.<init>(TempTable.java:167) [teiid-engine-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.query.tempdata.TempTable.createTupleSource(TempTable.java:507) [teiid-engine-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.query.tempdata.TempTable.createTupleSource(TempTable.java:499) [teiid-engine-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.query.tempdata.TempTableDataManager$5.createTupleSource(TempTableDataManager.java:663) [teiid-engine-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.query.tempdata.TempTableDataManager$ProxyTupleSource.nextTuple(TempTableDataManager.java:109) [teiid-engine-8.9.0.Final.jar:8.9.0.Final]
    at org.teiid.query.processor.relational.AccessNode.nextBatchDirect(AccessNode.java:369) [teiid-engine-8.9.0.Final.jar:8.9.0.Final]