SIGSEGV in Item_trigger_row::cleanup on condition pushdown of row = NEW into derived table in trigger

CREATE TABLE t (a INT, b INT);

CREATE TRIGGER tr BEFORE INSERT ON t FOR EACH ROW DO (SELECT 1 FROM (SELECT DISTINCT a, b FROM t) d WHERE (a, b) = NEW);

INSERT INTO t VALUES (1,2);

Core was generated by `/test/mtest/MDEV-34723/MD221026-mariadb-13.2.0-linux-x86_64-dbg/bin/mariadbd --'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x0000637e343eec14 in Item_trigger_row::cleanup (this=0x6e8e8c0a0ac0)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/item.h:8069

[Current thread is 1 (LWP 4154824)]

(gdb) bt

#0  0x0000637e343eec14 in Item_trigger_row::cleanup (this=0x6e8e8c0a0ac0)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/item.h:8069

#1  0x0000637e33e94c8a in Item::delete_self (this=0x6e8e8c0a0ac0)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/item.h:2700

#2  0x0000637e33e7f7e9 in Query_arena::free_items (this=0x6e8e8c000d78)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_class.cc:4359

#3  0x0000637e33e7f64c in THD::cleanup_after_query (this=0x6e8e8c000d60)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_class.cc:2637

#4  0x0000637e33debf84 in sp_head::execute (this=0x6e8e8c035700, thd=0x6e8e8c000d60, merge_da_on_success=false)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sp_head.cc:1440

#5  0x0000637e33deda17 in sp_head::execute_trigger (this=0x6e8e8c035700, thd=0x6e8e8c000d60, db_name=0x6e8e8c039028, table_name=0x6e8e8c039038, grant_info=0x6e8e8c03cf58)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sp_head.cc:1863

#6  0x0000637e3408681c in Table_triggers_list::process_triggers (this=0x6e8e8c03c980, thd=0x6e8e8c000d60, event=TRG_EVENT_INSERT, time_type=TRG_ACTION_BEFORE, old_row_is_record1=true, skip_row_indicator=0x768f7f90ef2f, fields_in_update_stmt=0x0)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_trigger.cc:2918

#7  0x0000637e33e615bd in fill_record_n_invoke_before_triggers (thd=0x6e8e8c000d60, table=0x6e8e8c032c90, ptr=0x6e8e8c03c560, values=@0x6e8e8c01b240: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x6e8e8c01b300, last = 0x6e8e8c01b3b0, elements = 2}, <No data fields>}, ignore_errors=false, event=TRG_EVENT_INSERT, skip_row_indicator=0x768f7f90ef2f)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_base.cc:9946

#8  0x0000637e33eb9734 in mysql_insert (thd=0x6e8e8c000d60, table_list=0x6e8e8c01a5e0, fields=@0x6e8e8c0062d0: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x637e35dcbda0 <end_of_list>, last = 0x6e8e8c0062d0, elements = 0}, <No data fields>}, values_list=@0x6e8e8c006318: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x6e8e8c01b3c0, last = 0x6e8e8c01b3c0, elements = 1}, <No data fields>}, update_fields=@0x6e8e8c006300: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x637e35dcbda0 <end_of_list>, last = 0x6e8e8c006300, elements = 0}, <No data fields>}, update_values=@0x6e8e8c0062e8: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x637e35dcbda0 <end_of_list>, last = 0x6e8e8c0062e8, elements = 0}, <No data fields>}, duplic=DUP_ERROR, ignore=false, result=0x0)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_insert.cc:1193

#9  0x0000637e33f2af3b in mysql_execute_command (thd=0x6e8e8c000d60, is_called_from_prepared_stmt=false)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_parse.cc:4549

#10 0x0000637e33f20a84 in mysql_parse (thd=0x6e8e8c000d60, rawbuf=0x6e8e8c01a4d0 "INSERT INTO t VALUES (1,2)", length=26, parser_state=0x768f7f910a80)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_parse.cc:8005

#11 0x0000637e33f1de4d in dispatch_command (command=COM_QUERY, thd=0x6e8e8c000d60, packet=0x6e8e8c00b701 "INSERT INTO t VALUES (1,2)", packet_length=26, blocking=true)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_parse.cc:1903

#12 0x0000637e33f21633 in do_command (thd=0x6e8e8c000d60, blocking=true)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_parse.cc:1437

#13 0x0000637e34127d29 in do_handle_one_connection (connect=0x637e593063a0, put_in_cache=true)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_connect.cc:1514

#14 0x0000637e34127ace in handle_one_connection (arg=0x637e593efbd0)at /test/mtest/MDEV-34723/bb-MDEV-34723-rucha_dbg/sql/sql_connect.cc:1426

#15 0x0000768fa589cb84 in start_thread (arg=<optimized out>)at ./nptl/pthread_create.c:447

#16 0x0000768fa5929ecc in clone3 ()at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78