[Draft] MSAN / valgrind errors in safe_substract / Histogram_builder::next

CREATE TABLE B (pk INTEGER AUTO_INCREMENT,

 col_int_nokey INTEGER,

 col_int_key INTEGER,

 col_date_key DATE,

 col_date_nokey DATE,

 col_time_key TIME,

 col_time_nokey TIME,

 col_datetime_key DATETIME,

 col_datetime_nokey DATETIME,

 col_varchar_key VARCHAR(1),

 col_varchar_nokey VARCHAR(1),

 PRIMARY KEY (pk DESC),

 KEY (col_varchar_key ASC, col_int_key)) CHARACTER SET cp1250 COLLATE cp1250_czech_cs;

INSERT /*! IGNORE */ INTO B (col_int_key, col_int_nokey,

 col_date_key, col_date_nokey,

 col_time_key, col_time_nokey,

 col_datetime_key, col_datetime_nokey,

 col_varchar_key, col_varchar_nokey) VALUES (6, 7, '2026-11-23', '2026-11-23', '09:19:37.055802', '09:19:37.055802', '1903-03-02 04:31:24.000649', '1903-03-02 04:31:24.000649', 'j', 'j');

ANALYZE TABLE B PERSISTENT FOR ALL;

==57350==WARNING: MemorySanitizer: use-of-uninitialized-value

    #0 0x55affe11a732 in safe_substract(unsigned long long, unsigned long long) /data/src/10.6-msan/sql/field.cc:1143:10

    #1 0x55affe11a732 in Field::pos_in_interval_val_str(Field*, Field*, unsigned int) /data/src/10.6-msan/sql/field.cc:1198:6

    #2 0x55affd8a6ba5 in Histogram_builder::next(void*, unsigned int) /data/src/10.6-msan/sql/sql_statistics.cc:1626:36

    #3 0x55b0003588ec in tree_walk_left_root_right /data/src/10.6-msan/mysys/tree.c:590:9

    #4 0x55b0003585fe in tree_walk /data/src/10.6-msan/mysys/tree.c:576:12

    #5 0x55affdad6eb6 in Unique::walk(TABLE*, int (*)(void*, unsigned int, void*), void*) /data/src/10.6-msan/sql/uniques.cc:654:12

    #6 0x55affd8a801e in Count_distinct_field::walk_tree_with_histogram(unsigned long long) /data/src/10.6-msan/sql/sql_statistics.cc:1754:11

    #7 0x55affd8a801e in Column_statistics_collected::finish(unsigned long long, double) /data/src/10.6-msan/sql/sql_statistics.cc:2426:23

    #8 0x55affd885138 in collect_statistics_for_table(THD*, TABLE*) /data/src/10.6-msan/sql/sql_statistics.cc:2725:37

    #9 0x55affdbdb488 in mysql_admin_table(THD*, TABLE_LIST*, st_ha_check_opt*, st_mysql_const_lex_string const*, thr_lock_type, bool, bool, unsigned int, int (*)(THD*, TABLE_LIST*, st_ha_check_opt*), int (handler::*)(THD*, st_ha_check_opt*), int (*)(THD*, TABLE_LIST*, st_ha_check_opt*), bool) /data/src/10.6-msan/sql/sql_admin.cc:1027:15

    #10 0x55affdbdef87 in Sql_cmd_analyze_table::execute(THD*) /data/src/10.6-msan/sql/sql_admin.cc:1521:8

    #11 0x55affd56a38e in mysql_execute_command(THD*, bool) /data/src/10.6-msan/sql/sql_parse.cc:6026:26

    #12 0x55affd55224a in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/src/10.6-msan/sql/sql_parse.cc:8050:18

    #13 0x55affd546790 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /data/src/10.6-msan/sql/sql_parse.cc:1896:7

    #14 0x55affd554640 in do_command(THD*, bool) /data/src/10.6-msan/sql/sql_parse.cc:1409:17

    #15 0x55affdb84e7f in do_handle_one_connection(CONNECT*, bool) /data/src/10.6-msan/sql/sql_connect.cc:1416:11

    #16 0x55affdb84465 in handle_one_connection /data/src/10.6-msan/sql/sql_connect.cc:1318:5

    #17 0x55affeffc18a in pfs_spawn_thread /data/src/10.6-msan/storage/perfschema/pfs.cc:2201:3

    #18 0x7fa74ffb4043 in start_thread nptl/./nptl/pthread_create.c:442:8

    #19 0x7fa75003461b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

  Uninitialized value was stored to memory at

    #0 0x55affe11a3e3 in char_prefix_to_ulonglong(unsigned char*) /data/src/10.6-msan/sql/field.cc:1131:11

    #1 0x55affe11a3e3 in Field::pos_in_interval_val_str(Field*, Field*, unsigned int) /data/src/10.6-msan/sql/field.cc:1195:9

  Uninitialized value was stored to memory at

    #0 0x55affe11a3aa in char_prefix_to_ulonglong(unsigned char*) /data/src/10.6-msan/sql/field.cc:1132:16

    #1 0x55affe11a3aa in Field::pos_in_interval_val_str(Field*, Field*, unsigned int) /data/src/10.6-msan/sql/field.cc:1195:9

  Uninitialized value was stored to memory at

    #0 0x55affe11a2ec in char_prefix_to_ulonglong(unsigned char*) /data/src/10.6-msan/sql/field.cc:1131:11

    #1 0x55affe11a2ec in Field::pos_in_interval_val_str(Field*, Field*, unsigned int) /data/src/10.6-msan/sql/field.cc:1195:9

  Uninitialized value was created by an allocation of 'minp_prefix' in the stack frame of function '_ZN5Field23pos_in_interval_val_strEPS_S0_j'

    #0 0x55affe119580 in Field::pos_in_interval_val_str(Field*, Field*, unsigned int) /data/src/10.6-msan/sql/field.cc:1180

SUMMARY: MemorySanitizer: use-of-uninitialized-value /data/src/10.6-msan/sql/field.cc:1143:10 in safe_substract(unsigned long long, unsigned long long)

Exiting