I have a JDBC connection to a DB2 database which has a table with a column of type VARGRAPHIC (a double-byte character VARCHAR). When gathering metadata during Teiid initialization, I get this exception:
org.teiid.metadata.MetadataException: TEIID60009 Unknown datatype null
at org.teiid.metadata.MetadataFactory.setDataType(MetadataFactory.java:272)
at org.teiid.metadata.MetadataFactory.addColumn(MetadataFactory.java:254)
at org.teiid.translator.jdbc.JDBCMetdataProcessor.addColumn(JDBCMetdataProcessor.java:425)
at org.teiid.translator.jdbc.JDBCMetdataProcessor.processColumns(JDBCMetdataProcessor.java:386)
at org.teiid.translator.jdbc.JDBCMetdataProcessor.getColumns(JDBCMetdataProcessor.java:361)
at org.teiid.translator.jdbc.JDBCMetdataProcessor.getTables(JDBCMetdataProcessor.java:312)
at org.teiid.translator.jdbc.JDBCMetdataProcessor.getConnectorMetadata(JDBCMetdataProcessor.java:159)
at org.teiid.translator.jdbc.JDBCExecutionFactory.getMetadata(JDBCExecutionFactory.java:307)
at org.teiid.translator.jdbc.JDBCExecutionFactory.getMetadata(JDBCExecutionFactory.java:68)
at org.teiid.query.metadata.NativeMetadataRepository.getMetadata(NativeMetadataRepository.java:96)
at org.teiid.query.metadata.NativeMetadataRepository.loadMetadata(NativeMetadataRepository.java:62)
at org.teiid.query.metadata.ChainingMetadataRepository.loadMetadata(ChainingMetadataRepository.java:55)
at org.teiid.runtime.EmbeddedServer.loadMetadata(EmbeddedServer.java:794)
at org.teiid.runtime.AbstractVDBDeployer.loadMetadata(AbstractVDBDeployer.java:210)
at org.teiid.runtime.EmbeddedServer.deployVDB(EmbeddedServer.java:744)
at org.teiid.runtime.EmbeddedServer.deployVDB(EmbeddedServer.java:685)

It looks like Teiid does not handle columns of type VARGRAPHIC (as seen in org.teiid.core.types.JDBCSQLTypeInfo).