TO_DATE: MSAN/valgrind uninitialised value errors parse_format_string

SET NAMES 'sjis';

--error ER_STD_INVALID_ARGUMENT

SELECT TO_DATE('P.M','P.M') AS x;

==2360964== Use of uninitialised value of size 8

==2360964==    at 0x13C879B: parse_format_string(String const*, unsigned short*, unsigned int*, MY_LOCALE const*, bool, String*, PARSE_TYPE_FLAGS*) (item_timefunc.cc:2793)

==2360964==    by 0x13CF699: Item_func_to_date::get_format() (item_timefunc.cc:4706)

==2360964==    by 0x13D02E8: Item_func_to_date::fix_length_and_dec(THD*) (item_timefunc.cc:4934)

==2360964==    by 0x12F8AAE: Item_func::fix_fields(THD*, Item**) (item_func.cc:412)

==2360964==    by 0xC9CEC1: Item::fix_fields_if_needed(THD*, Item**) (item.h:1143)

==2360964==    by 0xC9CEF6: Item::fix_fields_if_needed_for_scalar(THD*, Item**) (item.h:1152)

==2360964==    by 0xD27CC0: setup_fields(THD*, Bounds_checked_array<Item*>, List<Item>&, enum_column_usage, List<Item>*, List<Item>*, bool, THD_WHERE) (sql_base.cc:8261)

==2360964==    by 0xE56D2C: JOIN::prepare(TABLE_LIST*, Item*, unsigned int, st_order*, bool, st_order*, Item*, st_order*, st_select_lex*, st_select_lex_unit*) (sql_select.cc:1603)

==2360964==    by 0xE65097: 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*) (sql_select.cc:5425)

==2360964==    by 0xE52BE1: handle_select(THD*, LEX*, select_result*, unsigned long long) (sql_select.cc:636)

==2360964==    by 0xDF347C: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:6172)

==2360964==    by 0xDEAF50: mysql_execute_command(THD*, bool) (sql_parse.cc:3951)

==2360964==    by 0xDF8546: mysql_parse(THD*, char*, unsigned int, Parser_state*) (sql_parse.cc:7895)

==2360964==    by 0xDE461E: dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) (sql_parse.cc:1878)

==2360964==    by 0xDE2F77: do_command(THD*, bool) (sql_parse.cc:1417)

==2360964==    by 0xFFCC4B: do_handle_one_connection(CONNECT*, bool) (sql_connect.cc:1503)

==2361018==WARNING: MemorySanitizer: use-of-uninitialized-value

    #0 0x5564cd3f3012 in parse_format_string(String const*, unsigned short*, unsigned int*, MY_LOCALE const*, bool, String*, PARSE_TYPE_FLAGS*) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/item_timefunc.cc:2793:16

    #1 0x5564cd4032b8 in Item_func_to_date::get_format() /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/item_timefunc.cc:4706:9

    #2 0x5564cd4053dc in Item_func_to_date::fix_length_and_dec(THD*) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/item_timefunc.cc:4934:25

    #3 0x5564cd1e1f0d in Item_func::fix_fields(THD*, Item**) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/item_func.cc:412:7

    #4 0x5564cc4fe887 in Item::fix_fields_if_needed(THD*, Item**) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/item.h:1143:30

    #5 0x5564cc4fe887 in Item::fix_fields_if_needed_for_scalar(THD*, Item**) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/item.h:1152:12

    #6 0x5564cc4fe887 in setup_fields(THD*, Bounds_checked_array<Item*>, List<Item>&, enum_column_usage, List<Item>*, List<Item>*, bool, THD_WHERE) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_base.cc:8261:15

    #7 0x5564cc792080 in JOIN::prepare(TABLE_LIST*, Item*, unsigned int, st_order*, bool, st_order*, Item*, st_order*, st_select_lex*, st_select_lex_unit*) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_select.cc:1603:7

    #8 0x5564cc785452 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/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_select.cc:5425:21

    #9 0x5564cc784ac5 in handle_select(THD*, LEX*, select_result*, unsigned long long) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_select.cc:636:10

    #10 0x5564cc6c5948 in execute_sqlcom_select(THD*, TABLE_LIST*) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_parse.cc:6172:12

    #11 0x5564cc6b3590 in mysql_execute_command(THD*, bool) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_parse.cc:3951:12

    #12 0x5564cc6a1319 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_parse.cc:7895:18

    #13 0x5564cc69a5f4 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_parse.cc:1878:7

    #14 0x5564cc6a23d1 in do_command(THD*, bool) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_parse.cc:1417:17

    #15 0x5564ccb3dc6c in do_handle_one_connection(CONNECT*, bool) /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_connect.cc:1503:11

    #16 0x5564ccb3d746 in handle_one_connection /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/sql_connect.cc:1415:5

    #17 0x5564cd98ee67 in pfs_spawn_thread /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/storage/perfschema/pfs.cc:2198:3

    #18 0x7f549c8cd1c3 in start_thread nptl/pthread_create.c:442:8

    #19 0x7f549c94d85b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

  Uninitialized value was created by an allocation of 'format_str' in the stack frame

    #0 0x5564cd4030bb in Item_func_to_date::get_format() /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/item_timefunc.cc:4698:3

SUMMARY: MemorySanitizer: use-of-uninitialized-value /data/bld/preview-12.3/bb-12.3-MDEV-19683-to_date-msan/sql/item_timefunc.cc:2793:16 in parse_format_string(String const*, unsigned short*, unsigned int*, MY_LOCALE const*, bool, String*, PARSE_TYPE_FLAGS*)