Assertion `name.length == strlen(name.str)' failed in Item::print_item_w_name on SELECT w/ optimizer_trace enabled

SET optimizer_trace="enabled=on";

SELECT 'a\0';

mysqld: /test/10.5_dbg/sql/item.cc:497: void Item::print_item_w_name(String*, enum_query_type): Assertion `name.length == strlen(name.str)' failed.

Core was generated by `/test/MD210420-mariadb-10.5.3-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGABRT, Aborted.

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6)

    at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

[Current thread is 1 (Thread 0x7fb8730c0700 (LWP 546313))]

(gdb) bt

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

#1  0x00005566a1a0103d in my_write_core (sig=sig@entry=6) at /test/10.5_dbg/mysys/stacktrace.c:518

#2  0x00005566a11a6d7b in handle_fatal_signal (sig=6) at /test/10.5_dbg/sql/signal_handler.cc:329

#3  <signal handler called>

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

#5  0x00007fb871804801 in __GI_abort () at abort.c:79

#6  0x00007fb8717f439a in __assert_fail_base (fmt=0x7fb87197b7d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x5566a1d13328 "name.length == strlen(name.str)", file=file@entry=0x5566a1d12b0e "/test/10.5_dbg/sql/item.cc", line=line@entry=497, function=function@entry=0x5566a1d12900 <Item::print_item_w_name(String*, enum_query_type)::__PRETTY_FUNCTION__> "void Item::print_item_w_name(String*, enum_query_type)") at assert.c:92

#7  0x00007fb8717f4412 in __GI___assert_fail (assertion=assertion@entry=0x5566a1d13328 "name.length == strlen(name.str)", file=file@entry=0x5566a1d12b0e "/test/10.5_dbg/sql/item.cc", line=line@entry=497, function=function@entry=0x5566a1d12900 <Item::print_item_w_name(String*, enum_query_type)::__PRETTY_FUNCTION__> "void Item::print_item_w_name(String*, enum_query_type)") at assert.c:101

#8  0x00005566a11d04e5 in Item::print_item_w_name (this=this@entry=0x7fb845874598, str=str@entry=0x7fb8730be050, query_type=query_type@entry=1037) at /test/10.5_dbg/sql/item.cc:497

#9  0x00005566a0f58856 in st_select_lex::print (this=this@entry=0x7fb845874120, thd=thd@entry=0x7fb845815088, str=str@entry=0x7fb8730be050, query_type=query_type@entry=1037) at /test/10.5_dbg/sql/sql_select.cc:27658

#10 0x00005566a1105eca in opt_trace_print_expanded_query (thd=0x7fb845815088, select_lex=0x7fb845874120, writer=writer@entry=0x7fb8730be5a0) at /test/10.5_dbg/sql/opt_trace.cc:118

#11 0x00005566a0f6ce3c in JOIN::prepare (this=this@entry=0x7fb845874f20, tables_init=tables_init@entry=0x0, conds_init=conds_init@entry=0x0, og_num=og_num@entry=0, order_init=order_init@entry=0x0, skip_order_by=skip_order_by@entry=false, group_init=0x0, having_init=0x0, proc_param_init=0x0, select_lex_arg=0x7fb845874120, unit_arg=0x7fb845819098) at /test/10.5_dbg/sql/sql_select.cc:1482

#12 0x00005566a0f79385 in mysql_select (thd=thd@entry=0x7fb845815088, tables=0x0, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7fb845874ef8, unit=0x7fb845819098, select_lex=0x7fb845874120) at /test/10.5_dbg/sql/sql_select.cc:4634

#13 0x00005566a0f79787 in handle_select (thd=thd@entry=0x7fb845815088, lex=lex@entry=0x7fb845818fd0, result=result@entry=0x7fb845874ef8, setup_tables_done_option=setup_tables_done_option@entry=0) at /test/10.5_dbg/sql/sql_select.cc:417

#14 0x00005566a0f03ef4 in execute_sqlcom_select (thd=thd@entry=0x7fb845815088, all_tables=0x0) at /test/10.5_dbg/sql/sql_parse.cc:6172

#15 0x00005566a0efc919 in mysql_execute_command (thd=thd@entry=0x7fb845815088) at /test/10.5_dbg/sql/sql_parse.cc:3901

#16 0x00005566a0f09f2b in mysql_parse (thd=thd@entry=0x7fb845815088, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x7fb8730bf450, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.5_dbg/sql/sql_parse.cc:7957

#17 0x00005566a0ef5c45 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x7fb845815088, packet=packet@entry=0x7fb845867089 "SELECT 'a\\0'", packet_length=packet_length@entry=12, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.5_dbg/sql/sql_parse.cc:1839

#18 0x00005566a0ef449b in do_command (thd=0x7fb845815088) at /test/10.5_dbg/sql/sql_parse.cc:1358

#19 0x00005566a104f415 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x7fb8513c53a8, put_in_cache=put_in_cache@entry=true) at /test/10.5_dbg/sql/sql_connect.cc:1422

#20 0x00005566a104f744 in handle_one_connection (arg=arg@entry=0x7fb8513c53a8) at /test/10.5_dbg/sql/sql_connect.cc:1319

#21 0x00005566a14affb0 in pfs_spawn_thread (arg=0x7fb870c45b08) at /test/10.5_dbg/storage/perfschema/pfs.cc:2201

#22 0x00007fb8724e76db in start_thread (arg=0x7fb8730c0700) at pthread_create.c:463

#23 0x00007fb8718e588f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

10.3.23>SET optimizer_trace="enabled=on";

ERROR 1193 (HY000): Unknown system variable 'optimizer_trace'

10.3.23>SELECT 'a\0';

+----+

| a  |

+----+

| a  |

+----+

1 row in set (0.000 sec)

10.5.3>SET optimizer_trace="enabled=on";

Query OK, 0 rows affected (0.000 sec)

10.5.3>SELECT 'a\0';

+----+

| a  |

+----+

| a  |

+----+

1 row in set (0.000 sec)