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