fetching large packets via compressed connection returns unknown error.

static int test_conc69(MYSQL *my)

{

  int rc;

  MYSQL_RES *res;

  MYSQL_ROW row;

  MYSQL *mysql= mysql_init(NULL);

  rc= mysql_options(mysql, MYSQL_OPT_COMPRESS, (void *)1);

  check_mysql_rc(rc, my);

  rc= mysql_query(my, "SET @save:=@@max_allowed_packet");

  check_mysql_rc(rc, my);

  rc= mysql_query(my, "SET GLOBAL max_allowed_packet=1024 * 1024 * 21");

  check_mysql_rc(rc, my);

  if (!mysql_real_connect(mysql, hostname, username,

                             password, schema, port, socketname, 0))

  {

    diag("Error: %s", mysql_error(mysql));

    return FAIL;

  }

  rc= mysql_query(mysql, "DROP TABLE IF EXISTS t1");

  check_mysql_rc(rc, mysql);

  rc= mysql_query(mysql, "CREATE TABLE t1 (a LONGBLOB)");

  check_mysql_rc(rc, mysql);

  rc= mysql_query(mysql, "INSERT INTO t1 VALUES (REPEAT('A', 1024 * 1024 * 20))");

  check_mysql_rc(rc, mysql);

  rc= mysql_query(mysql, "SELECT a FROM t1");

  check_mysql_rc(rc, mysql);

  if (!(res= mysql_store_result(mysql)))

  {

    diag("Error: %s", mysql_error(mysql));

    return FAIL;

  }

  row= mysql_fetch_row(res);

  FAIL_IF(strlen(row[0]) != 1024 * 1024 * 20, "Wrong length");

  mysql_free_result(res);

  rc= mysql_query(my, "SET GLOBAL max_allowed_packet=@save");

  check_mysql_rc(rc, my);

  return OK;

}