FORMATTIMESTAMP function is not correctly pushed down when a column is passed as FORMAT argument

CREATE TABLE public.test
(
  ts timestamp without time zone,
  fmt character varying(100)
);

select FORMATTIMESTAMP(ts, fmt) from pg.test;

13:44:21,778 WARN  [org.teiid.CONNECTOR] (Worker3_QueryProcessorQueue19) J0VWrGay8mz0 Connector worker process failed for atomic-request=J0VWrGay8mz0.8.0.2: org.teiid.translator.jdbc.JDBCExecutionException: 0 TEIID11008:TEIID11004 Error executing statement(s): [Prepared Values: [] SQL: SELECT formattimestamp(g_0."ts", g_0."fmt") FROM "public"."test" AS g_0]
        at org.teiid.translator.jdbc.JDBCQueryExecution.execute(JDBCQueryExecution.java:131) [translator-jdbc-8.12.0.CR1.jar:8.12.0.CR1]
        at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.execute(ConnectorWorkItem.java:349)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_67]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_67]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_67]
        at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_67]
        at org.teiid.dqp.internal.datamgr.ConnectorManager$1.invoke(ConnectorManager.java:211)
        at com.sun.proxy.$Proxy47.execute(Unknown Source)
        at org.teiid.dqp.internal.process.DataTierTupleSource.getResults(DataTierTupleSource.java:298)
        at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:110)
        at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:107)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) [rt.jar:1.7.0_67]
        at org.teiid.dqp.internal.process.FutureWork.run(FutureWork.java:58)
        at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:276)
        at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119)
        at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_67]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_67]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_67]
Caused by: org.postgresql.util.PSQLException: ERROR: function formattimestamp(timestamp without time zone, character varying) does not exist
  Hint: No function matches the given name and argument types. You might need to add explicit casts.
  Character: 8
        at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157)
        at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886)
        at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
        at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:302)
        at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:462)
        at org.teiid.translator.jdbc.JDBCQueryExecution.execute(JDBCQueryExecution.java:123) [translator-jdbc-8.12.0.CR1.jar:8.12.0.CR1]
        ... 18 more