presto-phoenix/src/main/java/io/prestosql/plugin/phoenix/PhoenixMetadata.java/PhoenixMetadata/listSchemaNames
class PhoenixMetadata:    @Override
    public List<String> listSchemaNames(ConnectorSession session)
    {
        return ImmutableList.copyOf(phoenixClient.getSchemaNames(JdbcIdentity.from(session)));
    }