Server crash on SELECT from the table with ENGINE="FEDERATED" and federated_pushdown=1 with cursor-protocol

--source have_federatedx.inc

--source include/federated.inc

connection default;

set global federated_pushdown=1;

connection slave;

DROP TABLE IF EXISTS federated.t1;

CREATE TABLE federated.t1 (

  id int(20) NOT NULL,

  name varchar(16) NOT NULL default ''

)

DEFAULT CHARSET=latin1;

INSERT INTO federated.t1 VALUES

  (3,'xxx'), (7,'yyy'), (4,'xxx'), (1,'zzz'), (5,'yyy');

connection master;

DROP TABLE IF EXISTS federated.t1;

--replace_result $SLAVE_MYPORT SLAVE_PORT

eval

CREATE TABLE federated.t1 (

  id int(20) NOT NULL,

  name varchar(16) NOT NULL default ''

)

ENGINE="FEDERATED" DEFAULT CHARSET=latin1

CONNECTION='mysql://root@127.0.0.1:$SLAVE_MYPORT/federated/t1';

SELECT * FROM federated.t1;

set global federated_pushdown=0;

source include/federated_cleanup.inc;

At line 28: query 'SELECT * FROM federated.t1' failed: 2013: Lost connection to MySQL server during query

Thread pointer: 0x7fd83c000da0

Attempting backtrace. You can use the following information to find out

where mysqld died. If you see no messages after this, something went

terribly wrong...

stack_bottom = 0x7fd84eddbc70 thread_stack 0x49000

mysys/stacktrace.c:174(my_print_stacktrace)[0x562aade15fa6]

sql/signal_handler.cc:238(handle_fatal_signal)[0x562aad4a1d4c]

libc_sigaction.c:0(__restore_rt)[0x7fd858c42520]

sql/sql_union.cc:389(select_unit::create_result_table(THD*, List<Item>*, bool, unsigned long long, st_mysql_const_lex_string const*, bool, bool, bool, unsigned int))[0x562aad25d130]

sql/sql_cursor.cc:433(Select_materialize::send_result_set_metadata(List<Item>&, unsigned int))[0x562aad0e0b78]

sql/select_handler.cc:90(Pushdown_select::send_result_set_metadata())[0x562aad219699]

sql/select_handler.cc:140(Pushdown_select::execute())[0x562aad219972]

sql/sql_select.cc:4576(JOIN::exec_inner())[0x562aad19c9cc]

sql/sql_select.cc:4388(JOIN::exec())[0x562aad19bc88]

sql/sql_select.cc:4828(mysql_select(THD*, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*))[0x562aad19d484]

sql/sql_select.cc:442(handle_select(THD*, LEX*, select_result*, unsigned long))[0x562aad18c579]

sql/sql_parse.cc:6473(execute_sqlcom_select(THD*, TABLE_LIST*))[0x562aad14e702]

sql/sql_parse.cc:3976(mysql_execute_command(THD*))[0x562aad144c5a]

sql/sql_cursor.cc:138(mysql_open_cursor(THD*, select_result*, Server_side_cursor**))[0x562aad0dfd76]

sql/sql_prepare.cc:5004(Prepared_statement::execute(String*, bool))[0x562aad1752fa]

sql/sql_prepare.cc:4493(Prepared_statement::execute_loop(String*, bool, unsigned char*, unsigned char*))[0x562aad173640]

sql/sql_prepare.cc:3469(mysql_stmt_execute_common(THD*, unsigned long, unsigned char*, unsigned char*, unsigned long, bool, bool))[0x562aad170a0f]

sql/sql_prepare.cc:3254(mysqld_stmt_execute(THD*, char*, unsigned int))[0x562aad1702db]

sql/sql_parse.cc:1783(dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool))[0x562aad13df47]

sql/sql_parse.cc:1378(do_command(THD*))[0x562aad13ccb2]

sql/sql_connect.cc:1420(do_handle_one_connection(CONNECT*))[0x562aad2dfcc6]

sql/sql_connect.cc:1325(handle_one_connection)[0x562aad2dfa22]

perfschema/pfs.cc:1871(pfs_spawn_thread)[0x562aad86c967]

nptl/pthread_create.c:442(start_thread)[0x7fd858c94b43]

x86_64/clone3.S:83(__clone3)[0x7fd858d26a00]

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x7fd83c01c1a8): SELECT * FROM federated.t1