Assertion `got_name == named_item_expected()' failed in Json_writer::on_start_object on JSON-less testcase using optimizer_trace

SET sql_mode='';

CREATE TABLE t (a INT KEY,b INT,KEY(b)) ENGINE=MEMORY;

SET optimizer_trace=1;

INSERT INTO t VALUES (0,0);

SELECT a FROM t WHERE (a,b) in (SELECT @c,@d);

mysqld: /test/10.7_dbg/sql/my_json_writer.cc:42: void Json_writer::on_start_object(): Assertion `got_name == named_item_expected()' failed.

Core was generated by `/test/MD121221-mariadb-10.7.2-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGABRT, Aborted.

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50

[Current thread is 1 (Thread 0x14e8a0d6e700 (LWP 3592433))]

(gdb) bt

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50

#1  0x000014e8abfd2859 in __GI_abort () at abort.c:79

#2  0x000014e8abfd2729 in __assert_fail_base (fmt=0x14e8ac168588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x5645bb249e18 "got_name == named_item_expected()", file=0x5645bb249d20 "/test/10.7_dbg/sql/my_json_writer.cc", line=42, function=<optimized out>) at assert.c:92

#3  0x000014e8abfe3f36 in __GI___assert_fail (assertion=assertion@entry=0x5645bb249e18 "got_name == named_item_expected()", file=file@entry=0x5645bb249d20 "/test/10.7_dbg/sql/my_json_writer.cc", line=line@entry=42, function=function@entry=0x5645bb249f18 "void Json_writer::on_start_object()") at assert.c:101

#4  0x00005645ba72ab95 in Json_writer::on_start_object (this=0x5645bcecb130) at /test/10.7_dbg/sql/my_json_writer.cc:42

#5  Json_writer::start_object (this=this@entry=0x5645bcecb130) at /test/10.7_dbg/sql/my_json_writer.cc:51

#6  0x00005645ba5c744d in Json_writer_object::Json_writer_object (str=0x0, writer=0x5645bcecb130, this=<synthetic pointer>) at /test/10.7_dbg/sql/my_json_writer.h:444

#7  Json_writer_object::Json_writer_object (str=0x0, thd=<optimized out>, this=<synthetic pointer>) at /test/10.7_dbg/sql/my_json_writer.h:449

#8  JOIN::optimize_inner (this=this@entry=0x14e7e0016fd8) at /test/10.7_dbg/sql/sql_select.cc:1986

#9  0x00005645ba5c8e3a in JOIN::optimize (this=0x14e7e0016fd8) at /test/10.7_dbg/sql/sql_select.cc:1809

#10 0x00005645ba9482be in subselect_single_select_engine::exec (this=0x14e7e0015fb0) at /test/10.7_dbg/sql/item_subselect.cc:4034

#11 0x00005645ba947ba6 in Item_subselect::exec (this=this@entry=0x14e7e0015ce0) at /test/10.7_dbg/sql/item_subselect.cc:853

#12 0x00005645ba94d3e9 in Item_in_subselect::exec (this=0x14e7e0015ce0) at /test/10.7_dbg/sql/item_subselect.cc:1035

#13 0x00005645ba946a75 in Item_in_subselect::val_bool (this=0x14e7e0015ce0) at /test/10.7_dbg/sql/item_subselect.cc:1965

#14 0x00005645ba3ecd77 in Item::val_bool_result (this=<optimized out>) at /test/10.7_dbg/sql/item.h:1783

#15 0x00005645ba88e738 in Item_in_optimizer::val_int (this=0x14e7e0017650) at /test/10.7_dbg/sql/item_cmpfunc.cc:1637

#16 0x00005645ba5a50ab in make_join_select (join=join@entry=0x14e7e00168e8, select=0x14e7e00cb820, cond=0x14e7e0017650) at /test/10.7_dbg/sql/sql_select.cc:11727

#17 0x00005645ba5c56dd in JOIN::optimize_stage2 (this=this@entry=0x14e7e00168e8) at /test/10.7_dbg/sql/sql_select.cc:2742

#18 0x00005645ba5c8b47 in JOIN::optimize_inner (this=this@entry=0x14e7e00168e8) at /test/10.7_dbg/sql/sql_select.cc:2479

#19 0x00005645ba5c8e3a in JOIN::optimize (this=this@entry=0x14e7e00168e8) at /test/10.7_dbg/sql/sql_select.cc:1809

#20 0x00005645ba5c94de in mysql_select (thd=thd@entry=0x14e7e0000db8, tables=0x14e7e0014468, fields=@0x14e7e0014128: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x14e7e0014420, last = 0x14e7e0014420, elements = 1}, <No data fields>}, conds=0x14e7e0015ce0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x14e7e00168c0, unit=0x14e7e00051c0, select_lex=0x14e7e0013e88) at /test/10.7_dbg/sql/sql_select.cc:4979

#21 0x00005645ba5c97e2 in handle_select (thd=thd@entry=0x14e7e0000db8, lex=lex@entry=0x14e7e00050e8, result=result@entry=0x14e7e00168c0, setup_tables_done_option=setup_tables_done_option@entry=0) at /test/10.7_dbg/sql/sql_select.cc:545

#22 0x00005645ba528c1e in execute_sqlcom_select (thd=thd@entry=0x14e7e0000db8, all_tables=0x14e7e0014468) at /test/10.7_dbg/sql/sql_parse.cc:6253

#23 0x00005645ba535af1 in mysql_execute_command (thd=thd@entry=0x14e7e0000db8, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /test/10.7_dbg/sql/sql_parse.cc:3944

#24 0x00005645ba521e0f in mysql_parse (thd=thd@entry=0x14e7e0000db8, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x14e8a0d6d400) at /test/10.7_dbg/sql/sql_parse.cc:8028

#25 0x00005645ba530aab in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x14e7e0000db8, packet=packet@entry=0x14e7e000b879 "SELECT a FROM t WHERE (a,b) in (SELECT @c,@d)", packet_length=packet_length@entry=45, blocking=blocking@entry=true) at /test/10.7_dbg/sql/sql_class.h:1360

#26 0x00005645ba533eea in do_command (thd=0x14e7e0000db8, blocking=blocking@entry=true) at /test/10.7_dbg/sql/sql_parse.cc:1402

#27 0x00005645ba6ad902 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x5645bceaae48, put_in_cache=put_in_cache@entry=true) at /test/10.7_dbg/sql/sql_connect.cc:1418

#28 0x00005645ba6adf07 in handle_one_connection (arg=arg@entry=0x5645bceaae48) at /test/10.7_dbg/sql/sql_connect.cc:1312

#29 0x00005645bab2e33e in pfs_spawn_thread (arg=0x5645bcdbe738) at /test/10.7_dbg/storage/perfschema/pfs.cc:2201

#30 0x000014e8ac4e1609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#31 0x000014e8ac0cf293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95