Assertion 'ib_table.n_v_cols' failed in instant_alter_column_possible

USE test;

CREATE TABLE t (a BLOB) ENGINE=InnoDB;

INSERT INTO t VALUES ('a');

ALTER TABLE t ADD COLUMN (c INT GENERATED ALWAYS AS (a+1) VIRTUAL), ADD INDEX idx1 (c);

ALTER TABLE t ADD d INT, ALGORITHM=INPLACE;

mysqld: /test/10.5_dbg/storage/innobase/handler/handler0alter.cc:1467: bool instant_alter_column_possible(const dict_table_t&, const Alter_inplace_info*, const TABLE*, const TABLE*, bool): Assertion `ib_table.n_v_cols' failed.

Core was generated by `/test/MD211020-mariadb-10.5.7-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGABRT, Aborted.

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6)

    at ../sysdeps/unix/sysv/linux/pthread_kill.c:56

[Current thread is 1 (Thread 0x150a4c1ad700 (LWP 859941))]

(gdb) bt

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:56

#1  0x0000559d913e7869 in my_write_core (sig=sig@entry=6) at /test/10.5_dbg/mysys/stacktrace.c:424

#2  0x0000559d90b3cf1f in handle_fatal_signal (sig=6) at /test/10.5_dbg/sql/signal_handler.cc:330

#3  <signal handler called>

#4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50

#5  0x0000150a61229859 in __GI_abort () at abort.c:79

#6  0x0000150a61229729 in __assert_fail_base (fmt=0x150a613bf588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x559d9179b780 "ib_table.n_v_cols", file=0x559d91796998 "/test/10.5_dbg/storage/innobase/handler/handler0alter.cc", line=1467, function=<optimized out>) at assert.c:92

#7  0x0000150a6123af36 in __GI___assert_fail (assertion=assertion@entry=0x559d9179b780 "ib_table.n_v_cols", file=file@entry=0x559d91796998 "/test/10.5_dbg/storage/innobase/handler/handler0alter.cc", line=line@entry=1467, function=function@entry=0x559d91796d80 "bool instant_alter_column_possible(const dict_table_t&, const Alter_inplace_info*, const TABLE*, const TABLE*, bool)") at assert.c:101

#8  0x0000559d90f683ec in instant_alter_column_possible (ib_table=Python Exception <class 'AttributeError'> 'NoneType' object has no attribute 'pointer': 

Python Exception <class 'AttributeError'> 'NoneType' object has no attribute 'pointer': 

@0x1509f801e848: {id = 20, id_hash = 0x0, name = {m_name = 0x1509f801ce48 "test/t", static part_suffix = "#P#"}, name_hash = 0x0, heap = 0x1509f801e6b8, data_dir_path = 0x0, space = 0x1509f80207f8, space_id = 5, flags = 33, flags2 = 80, skip_alter_undo = 0, file_unreadable = 0, cached = 1, to_be_dropped = 0, n_def = 4, n_cols = 4, n_t_cols = 4, n_t_def = 4, n_v_def = 0, n_v_cols = 0, persistent_autoinc = 0, can_be_evicted = 1, corrupted = 0, drop_aborted = 1, cols = 0x1509f801ec38, v_cols = 0x1509f801ecb8, s_cols = 0x0, instant = 0x0, col_names = 0x1509f801ed10 "a", v_col_names = 0x0, vers_start = 0, vers_end = 0, is_system_db = false, dict_frm_mismatch = DICT_FRM_CONSISTENT, fts_doc_id_index = 0x0, indexes = {count = 2, start = 0x1509f8022158, end = 0x1509f8077d28, node = &dict_index_t::indexes, init = 51966}, freed_indexes = {count = 0, start = 0x0, end = 0x0, node = &dict_index_t::indexes, init = 51966}, foreign_list = {count = 0, start = 0x0, end = 0x0, node = &dict_foreign_t::heap, init = 0}, referenced_list = {count = 0, start = 0x0, end = 0x0, node = &dict_foreign_t::heap, init = 0}, table_LRU = {prev = 0x0, next = 0x150a2c0120c8}, fk_max_recusive_level = 0, n_foreign_key_checks_running = {m_counter = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = 0}, <No data fields>}}, query_cache_inv_trx_id = 30, def_trx_id = 31, foreign_set = std::set with 0 elements, referenced_set = std::set with 0 elements, stats_latch = {<latch_t> = {_vptr.latch_t = 0x559d91c902d8 <vtable for rw_lock_t+16>, m_id = LATCH_ID_INDEX_TREE, m_rw_lock = true}, <ilist_node<void>> = {next = 0x150a0401bb28, prev = 0x1509f80208b0}, created = true, lock_word = {m = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = 536870912}, <No data fields>}}, waiters = {m = {<std::__atomic_base<unsigned int>> = {static _S_alignment = 4, _M_i = 0}, <No data fields>}}, sx_recursive = 0, writer_thread = 0, event = 0x1509f801f3e8, wait_ex_event = 0x1509f801f478, cfile_name = 0x559d91811650 "/test/10.5_dbg/storage/innobase/dict/dict0mem.cc", last_x_file_name = 0x559d91812398 "/test/10.5_dbg/storage/innobase/dict/dict0stats.cc", cline = 214, is_block_lock = 0, last_x_line = 3262, count_os_wait = 0, pfs_psi = 0x0, debug_list = {count = 0, start = 0x0, end = 0x0, node = &rw_lock_debug_t::list, init = 51966}, level = SYNC_INDEX_TREE}, stats_latch_inited = true, stat_initialized = 1, stats_last_recalc = 0, stat_persistent = 0, stats_auto_recalc = 0, stats_sample_pages = 0, stat_n_rows = 1, stat_clustered_index_size = 1, stat_sum_of_other_index_sizes = 0, stat_modified_counter = 1, stats_bg_flag = 0 '\000', stats_error_printed = false, autoinc_lock = 0x1509f801ecb8, autoinc_mutex = {<std::__mutex_base> = {_M_mutex = pthread_mutex_t = {

            Type = Normal,

            Status = Not acquired,

            Robust = No,

            Shared = No,

            Protocol = None

          }}, <No data fields>}, autoinc = 0, n_waiting_or_granted_auto_inc_locks = 0, autoinc_trx = 0x0, fts = 0x0, quiesce = QUIESCE_NONE, n_rec_locks = 0, n_ref_count = {m_counter = {<std::__atomic_base<unsigned int>> = {static _S_alignment = 4, _M_i = 1}, <No data fields>}}, locks = {count = 0, start = 0x0, end = 0x0, node = &lock_table_t::locks, init = 51966}, update_time = 1604133412, magic_n = 76333786, vc_templ = 0x0}, ha_alter_info=ha_alter_info@entry=0x150a4c1a9740, table=0x1509f8024018, altered_table=altered_table@entry=0x150a4c1a97e0, strict=<optimized out>) at /test/10.5_dbg/storage/innobase/handler/handler0alter.cc:1467

#9  0x0000559d90f6fff4 in ha_innobase::check_if_supported_inplace_alter (this=0x1509f8024910, altered_table=0x150a4c1a97e0, ha_alter_info=0x150a4c1a9740) at /test/10.5_dbg/storage/innobase/handler/ha_innodb.h:445

#10 0x0000559d90954cc8 in mysql_alter_table (thd=thd@entry=0x1509f8000db8, new_db=new_db@entry=0x1509f8005800, new_name=new_name@entry=0x1509f8005c00, create_info=create_info@entry=0x150a4c1ab470, table_list=<optimized out>, table_list@entry=0x1509f8012a18, alter_info=alter_info@entry=0x150a4c1ab3a0, order_num=0, order=0x0, ignore=false, if_exists=false) at /test/10.5_dbg/sql/sql_table.cc:10526

#11 0x0000559d909d9f35 in Sql_cmd_alter_table::execute (this=<optimized out>, thd=0x1509f8000db8) at /test/10.5_dbg/sql/structs.h:559

#12 0x0000559d9087f64b in mysql_execute_command (thd=thd@entry=0x1509f8000db8) at /test/10.5_dbg/sql/sql_parse.cc:5952

#13 0x0000559d90865e17 in mysql_parse (thd=thd@entry=0x1509f8000db8, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x150a4c1ac3d0, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.5_dbg/sql/sql_parse.cc:7994

#14 0x0000559d90874133 in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x1509f8000db8, packet=packet@entry=0x1509f8008f89 "ALTER TABLE t ADD d INT, ALGORITHM=INPLACE", packet_length=packet_length@entry=42, is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false) at /test/10.5_dbg/sql/sql_class.h:1254

#15 0x0000559d9087785e in do_command (thd=0x1509f8000db8) at /test/10.5_dbg/sql/sql_parse.cc:1348

#16 0x0000559d909d22c6 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x559d935e6158, put_in_cache=put_in_cache@entry=true) at /test/10.5_dbg/sql/sql_connect.cc:1410

#17 0x0000559d909d29cd in handle_one_connection (arg=arg@entry=0x559d935e6158) at /test/10.5_dbg/sql/sql_connect.cc:1312

#18 0x0000559d90e87cfd in pfs_spawn_thread (arg=0x559d934ee178) at /test/10.5_dbg/storage/perfschema/pfs.cc:2201

#19 0x0000150a61737609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#20 0x0000150a61326293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95