Accessing a view defined as:

create view v (col string[]) as select null union all select null

Results in an exception:

org.teiid.core.TeiidRuntimeException: TEIID30447 org.teiid.api.exception.query.QueryResolverException: TEIID30082 Expected value of type 'null' but 'null' is of type 'string[]' and no implicit conversion is available.