Sybase translator error caused by change in ASCII function pushdown

registerFunctionModifier(SourceSystemFunctions.ASCII, new AliasModifier("unicode")); //$NON-NLS-1$

SELECT INTKEY, ASCII(INTKEY) FROM BQT1.SmallA

SELECT g_0.intkey, unicode(cast(g_0.intkey AS varchar(4000))) FROM smalla g_0

12:42:04,102 WARN  [org.teiid.CONNECTOR] (Worker1_QueryProcessorQueue18) Connector worker process failed for atomic-request=reZs6o4Ybhhc.8.0.1: org.teiid.translator.jdbc.JDBCExecutionException: 14216 TEIID11008:TEIID11004 Error executing statement(s): [Prepared Values: [] SQL: SELECT g_0.intkey, unicode(cast(g_0.intkey AS varchar(4000))) FROM smalla g_0]
	at org.teiid.translator.jdbc.JDBCQueryExecution.execute(JDBCQueryExecution.java:131) [translator-jdbc-8.12.14.6_4-redhat-64-2.jar:8.12.14.6_4-redhat-64-2]
	at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.execute(ConnectorWorkItem.java:361)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.8.0_151]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [rt.jar:1.8.0_151]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_151]
	at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_151]
	at org.teiid.dqp.internal.datamgr.ConnectorManager$1.invoke(ConnectorManager.java:211)
	at com.sun.proxy.$Proxy79.execute(Unknown Source)
	at org.teiid.dqp.internal.process.DataTierTupleSource.getResults(DataTierTupleSource.java:306)
	at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:112)
	at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:108)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [rt.jar:1.8.0_151]
	at org.teiid.dqp.internal.process.FutureWork.run(FutureWork.java:65)
	at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:284)
	at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119)
	at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [rt.jar:1.8.0_151]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [rt.jar:1.8.0_151]
	at java.lang.Thread.run(Thread.java:748) [rt.jar:1.8.0_151]
Caused by: com.sybase.jdbc4.jdbc.SybSQLException: Function 'unicode' not found. If this is a SQLJ function or SQL function, use sp_help to check whether the object exists (sp_help may produce a large amount of output).

	at com.sybase.jdbc4.tds.Tds.processEed(Tds.java:4003)
	at com.sybase.jdbc4.tds.Tds.nextResult(Tds.java:3093)
	at com.sybase.jdbc4.jdbc.ResultGetter.nextResult(ResultGetter.java:78)
	at com.sybase.jdbc4.jdbc.SybStatement.nextResult(SybStatement.java:289)
	at com.sybase.jdbc4.jdbc.SybStatement.nextResult(SybStatement.java:271)
	at com.sybase.jdbc4.jdbc.SybStatement.queryLoop(SybStatement.java:2408)
	at com.sybase.jdbc4.jdbc.SybStatement.executeQuery(SybStatement.java:2394)
	at com.sybase.jdbc4.jdbc.SybPreparedStatement.executeQuery(SybPreparedStatement.java:257)
	at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:462)
	at org.teiid.translator.jdbc.JDBCQueryExecution.execute(JDBCQueryExecution.java:123) [translator-jdbc-8.12.14.6_4-redhat-64-2.jar:8.12.14.6_4-redhat-64-2]
	... 18 more

12:42:04,118 WARN  [org.teiid.PROCESSOR] (Worker0_QueryProcessorQueue19) TEIID30020 Processing exception for request reZs6o4Ybhhc.8 'TEIID30504 Source: 14216 TEIID11008:TEIID11004 Error executing statement(s): [Prepared Values: [] SQL: SELECT g_0.intkey, unicode(cast(g_0.intkey AS varchar(4000))) FROM smalla g_0]'. Originally TeiidProcessingException 'Function 'unicode' not found. If this is a SQLJ function or SQL function, use sp_help to check whether the object exists (sp_help may produce a large amount of output).
' Tds.java:4003. Enable more detailed logging to see the entire stacktrace.

SELECT g_0.intkey, ascii(cast(g_0.intkey AS varchar(4000))) FROM smalla g_0