Valgrind/MSAN warnings in dynamic_column_update_move_left

SELECT COLUMN_GET(COLUMN_ADD(COLUMN_CREATE(1,10),2,NULL,1,NULL),3 AS INTEGER);

==3319749==WARNING: MemorySanitizer: use-of-uninitialized-value

    #0 0x556c9b48a02e in dynamic_column_update_move_left /data/src/10.5-msan/mysys/ma_dyncol.c

    #1 0x556c9b48a02e in dynamic_column_update_many_fmt /data/src/10.5-msan/mysys/ma_dyncol.c:3568:11

    #2 0x556c9959b4b1 in Item_func_dyncol_add::val_str(String*) /data/src/10.5-msan/sql/item_strfunc.cc:4752:13

    #3 0x556c9959c56e in Item_dyncol_get::get_dyn_value(THD*, st_dynamic_column_value*, String*) /data/src/10.5-msan/sql/item_strfunc.cc:4848:17

    #4 0x556c9959e42c in Item_dyncol_get::val_int() /data/src/10.5-msan/sql/item_strfunc.cc:4964:7

    #5 0x556c995c5304 in Item_dyncol_get::val_int_signed_typecast() /data/src/10.5-msan/sql/item_strfunc.h:1768:21

    #6 0x556c994c2ff6 in Item_func_signed::val_int() /data/src/10.5-msan/sql/item_func.h:1329:30

    #7 0x556c98e60842 in Type_handler::Item_send_longlong(Item*, Protocol*, st_value*) const /data/src/10.5-msan/sql/sql_type.cc:7485:22

    #8 0x556c98e60842 in Type_handler_longlong::Item_send(Item*, Protocol*, st_value*) const /data/src/10.5-msan/sql/sql_type.h:5774:12

    #9 0x556c98179ac2 in Protocol::send_result_set_row(List<Item>*) /data/src/10.5-msan/sql/protocol.cc:1087:15

    #10 0x556c984177db in select_send::send_data(List<Item>&) /data/src/10.5-msan/sql/sql_class.cc:3155:17

    #11 0x556c987696b1 in select_result_sink::send_data_with_check(List<Item>&, st_select_lex_unit*, unsigned long long) /data/src/10.5-msan/sql/sql_class.h:5459:12

    #12 0x556c987696b1 in JOIN::exec_inner() /data/src/10.5-msan/sql/sql_select.cc:4470:22

    #13 0x556c98764668 in JOIN::exec() /data/src/10.5-msan/sql/sql_select.cc:4382:3

    #14 0x556c986cdae0 in mysql_select(THD*, TABLE_LIST*, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) /data/src/10.5-msan/sql/sql_select.cc:4859:9

    #15 0x556c986cc4f6 in handle_select(THD*, LEX*, select_result*, unsigned long) /data/src/10.5-msan/sql/sql_select.cc:450:10

    #16 0x556c986034ce in execute_sqlcom_select(THD*, TABLE_LIST*) /data/src/10.5-msan/sql/sql_parse.cc:6341:12

    #17 0x556c985dd60b in mysql_execute_command(THD*) /data/src/10.5-msan/sql/sql_parse.cc:4018:12

    #18 0x556c985c4937 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.5-msan/sql/sql_parse.cc:8118:18

    #19 0x556c985b7f03 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.5-msan/sql/sql_parse.cc:1891:7

    #20 0x556c985c68d8 in do_command(THD*) /data/src/10.5-msan/sql/sql_parse.cc:1375:17

    #21 0x556c98bc6c9f in do_handle_one_connection(CONNECT*, bool) /data/src/10.5-msan/sql/sql_connect.cc:1416:11

    #22 0x556c98bc6395 in handle_one_connection /data/src/10.5-msan/sql/sql_connect.cc:1318:5

    #23 0x556c99fdbf9a in pfs_spawn_thread /data/src/10.5-msan/storage/perfschema/pfs.cc:2201:3

    #24 0x7fc4b8a0bfd3 in start_thread nptl/./nptl/pthread_create.c:442:8

    #25 0x7fc4b8a8c5bb in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

  Memory was marked as uninitialized

    #0 0x556c980ac53e in __msan_allocated_memory (/mnt8t/src/10.5-msan/sql/mariadbd+0x77a53e)

    #1 0x556c9b422266 in my_malloc /data/src/10.5-msan/mysys/my_malloc.c:114:7

SUMMARY: MemorySanitizer: use-of-uninitialized-value /data/src/10.5-msan/mysys/ma_dyncol.c in dynamic_column_update_move_left

==3319964== Conditional jump or move depends on uninitialised value(s)

==3319964==    at 0x17C91B7: dynamic_column_update_move_left (ma_dyncol.c:2920)

==3319964==    by 0x17CA995: dynamic_column_update_many_fmt (ma_dyncol.c:3568)

==3319964==    by 0x17C9914: mariadb_dyncol_update_many_num (ma_dyncol.c:3272)

==3319964==    by 0xEDE230: Item_func_dyncol_add::val_str(String*) (item_strfunc.cc:4752)

==3319964==    by 0xEDE75A: Item_dyncol_get::get_dyn_value(THD*, st_dynamic_column_value*, String*) (item_strfunc.cc:4848)

==3319964==    by 0xEDEDCC: Item_dyncol_get::val_int() (item_strfunc.cc:4964)

==3319964==    by 0xEE342B: Item_dyncol_get::val_int_signed_typecast() (item_strfunc.h:1768)

==3319964==    by 0xEA38ED: Item_func_signed::val_int() (item_func.h:1329)

==3319964==    by 0xCDA272: Type_handler::Item_send_longlong(Item*, Protocol*, st_value*) const (sql_type.cc:7485)

==3319964==    by 0xCE8473: Type_handler_longlong::Item_send(Item*, Protocol*, st_value*) const (sql_type.h:5774)

==3319964==    by 0x91ADD1: Item::send(Protocol*, st_value*) (item.h:1068)

==3319964==    by 0x913C41: Protocol::send_result_set_row(List<Item>*) (protocol.cc:1087)

==3319964==    by 0x9D96A8: select_send::send_data(List<Item>&) (sql_class.cc:3155)

==3319964==    by 0xB022F4: select_result_sink::send_data_with_check(List<Item>&, st_select_lex_unit*, unsigned long long) (sql_class.h:5459)

==3319964==    by 0xAB37A2: JOIN::exec_inner() (sql_select.cc:4470)

==3319964==    by 0xAB2FFA: JOIN::exec() (sql_select.cc:4382)