MSAN/Valgrind uninitialised value errors in TABLE::vers_switch_partition

--source include/have_partition.inc

CREATE TABLE t (a INT) WITH SYSTEM VERSIONING PARTITION BY SYSTEM_TIME LIMIT 100 PARTITIONS 3;

--error ER_DELAYED_NOT_SUPPORTED

INSERT DELAYED INTO t () VALUES ();

# Cleanup

DROP TABLE t;

==220086== Conditional jump or move depends on uninitialised value(s)

==220086==    at 0xA217F9: TABLE::vers_switch_partition(THD*, TABLE_LIST*, Open_table_context*) (sql_base.cc:1705)

==220086==    by 0xA22A2E: open_table(THD*, TABLE_LIST*, Open_table_context*) (sql_base.cc:2215)

==220086==    by 0xA26E63: open_and_process_table(THD*, TABLE_LIST*, unsigned int*, unsigned int, Prelocking_strategy*, bool, Open_table_context*) (sql_base.cc:4108)

==220086==    by 0xA2815A: open_tables(THD*, DDL_options_st const&, TABLE_LIST**, unsigned int*, unsigned int, Prelocking_strategy*) (sql_base.cc:4595)

==220086==    by 0xA2A14B: open_and_lock_tables(THD*, DDL_options_st const&, TABLE_LIST*, bool, unsigned int, Prelocking_strategy*) (sql_base.cc:5569)

==220086==    by 0xA1E16C: open_and_lock_tables(THD*, TABLE_LIST*, bool, unsigned int, Prelocking_strategy*) (sql_base.h:279)

==220086==    by 0xA29A34: open_n_lock_single_table(THD*, TABLE_LIST*, thr_lock_type, unsigned int, Prelocking_strategy*) (sql_base.cc:5414)

==220086==    by 0xA8C1D5: Delayed_insert::open_and_lock_table() (sql_insert.cc:3118)

==220086==    by 0xA8C4F0: handle_delayed_insert (sql_insert.cc:3228)

==220086==    by 0x11C7AF5: pfs_spawn_thread (pfs.cc:2201)

==220086==    by 0x4CE2EA6: start_thread (pthread_create.c:477)

==220086==    by 0x512CAEE: clone (clone.S:95)

commit 92bfc0e8c4bb5c86359c29458d67f3e7836ec18a

Author: Aleksey Midenkov

Date:   Fri May 6 10:45:17 2022 +0300

    MDEV-17554 Auto-create new partition for system versioned tables with history partitioned by INTERVAL/LIMIT

commit 75ede427e429b24001fc55bb284c110875fbf85a

Author: Aleksey Midenkov

Date:   Fri May 6 10:45:17 2022 +0300

    MDEV-27328 Change of SYSTEM_TIME partitioning options is not possible without data copy