presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/ForwardingJdbcClient.java/ForwardingJdbcClient/getColumns
class ForwardingJdbcClient:    @Override
    public List<JdbcColumnHandle> getColumns(ConnectorSession session, JdbcTableHandle tableHandle)
    {
        return getDelegate().getColumns(session, tableHandle);
    }