presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/CassandraMetadata.java/CassandraMetadata/listSchemaNames
class CassandraMetadata:    @Override
    public List<String> listSchemaNames(ConnectorSession session)
    {
        return cassandraSession.getCaseSensitiveSchemaNames().stream()
                .map(name -> name.toLowerCase(ENGLISH))
                .collect(toImmutableList());
    }