federatedx crashes on SELECT ... INTO query in select_handler code

diff -urp '--exclude=.*' 10.5-orig/mysql-test/suite/federated/federatedx_create_handlers.test 10.5-clustrix-noc/mysql-test/suite/federated/federatedx_create_handlers.test

--- 10.5-orig/mysql-test/suite/federated/federatedx_create_handlers.test       2020-03-06 21:40:17.439601036 +0300

+++ 10.5-noc/mysql-test/suite/federated/federatedx_create_handlers.test        2020-03-04 14:59:44.533465056 +0300

@@ -147,6 +147,22 @@ FROM federated.t3,

        SELECT * FROM federated.t1 WHERE id >= 5) t

 WHERE federated.t3.name=t.name;

+--echo # More tests

+CREATE TABLE federated.t_local (

+  id int(20) NOT NULL,

+  name varchar(16) NOT NULL default ''

+) engine=myisam;

+

+insert into federated.t_local select * from federated.t1;

+--sorted_result

+select * from federated.t_local;

+

+select name into @var from federated.t1 where id=3 limit 1 ;

+select @var;

+select name into outfile 'tmp.txt' from federated.t1;

+

+let $path=`select concat(@@datadir, 'test/tmp.txt')`;

+remove_file $path;

Thread 7 "mysqld" received signal SIGABRT, Aborted.

[Switching to Thread 0x7ffff05f5700 (LWP 20531)]

__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51

51      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.

(gdb) wher

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51

#1  0x00007ffff56bd801 in __GI_abort () at abort.c:79

#2  0x00007ffff56ad39a in __assert_fail_base (fmt=0x7ffff58347d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x555556af7ab0 "0", file=file@entry=0x555556af7788 "/home/psergey/dev-git2/10.5/sql/protocol.cc", line=line@entry=617, 

    function=function@entry=0x555556af8130 <Protocol::end_statement()::__PRETTY_FUNCTION__> "void Protocol::end_statement()") at assert.c:92

#3  0x00007ffff56ad412 in __GI___assert_fail (assertion=0x555556af7ab0 "0", file=0x555556af7788 "/home/psergey/dev-git2/10.5/sql/protocol.cc", line=617, function=0x555556af8130 <Protocol::end_statement()::__PRETTY_FUNCTION__> "void Protocol::end_statement()") at assert.c:101

#4  0x0000555555cae830 in Protocol::end_statement (this=0x7fffd8001328) at /home/psergey/dev-git2/10.5/sql/protocol.cc:617

#5  0x0000555555ddaee2 in dispatch_command (command=COM_QUERY, thd=0x7fffd8000d60, packet=0x7fffd8008801 "select name into @var from federated.t1 where id=3 limit 1 ", packet_length=59, is_com_multi=false, is_next_command=false) at /home/psergey/dev-git2/10.5/sql/sql_parse.cc:2435

#6  0x0000555555dd75a8 in do_command (thd=0x7fffd8000d60) at /home/psergey/dev-git2/10.5/sql/sql_parse.cc:1363

#7  0x0000555555f775c9 in do_handle_one_connection (connect=0x555558436320, put_in_cache=true) at /home/psergey/dev-git2/10.5/sql/sql_connect.cc:1422

#8  0x0000555555f772f8 in handle_one_connection (arg=0x555558436320) at /home/psergey/dev-git2/10.5/sql/sql_connect.cc:1319

#9  0x00005555564d60ce in pfs_spawn_thread (arg=0x5555584363f0) at /home/psergey/dev-git2/10.5/storage/perfschema/pfs.cc:1869

#10 0x00007ffff65b86db in start_thread (arg=0x7ffff05f5700) at pthread_create.c:463

#11 0x00007ffff579e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95