Assertion failure in set_warning_truncated_wrong_value / Column_stat::load_histogram after failed constraint creation

CREATE TABLE t1 (a INT) ENGINE=MyISAM;

INSERT INTO t1 VALUES (1),(1);

CREATE TABLE t2 (b VARCHAR(255)) CHARACTER SET utf8mb4;

INSERT INTO t2 VALUES (_ASCII 0x06),('foo');

--error ER_DUP_ENTRY

ALTER TABLE t1 ADD UNIQUE (a);

SET histogram_type = JSON_HB;

ANALYZE TABLE t2 PERSISTENT FOR ALL;

SELECT * FROM t2;

# Cleanup

DROP TABLE t1, t2;

mariadbd: /data/src/preview-10.7-MDEV-21130-json-histograms/sql/field.cc:11173: void Field::set_warning_truncated_wrong_value(const char*, const char*): Assertion `table' failed.

210911 19:34:59 [ERROR] mysqld got signal 6 ;

#7  0x00007ff76e818f36 in __GI___assert_fail (assertion=0x55a1fb7be87e "table", file=0x55a1fb7ba498 "/data/src/preview-10.7-MDEV-21130-json-histograms/sql/field.cc", line=11173, function=0x55a1fb7be888 "void Field::set_warning_truncated_wrong_value(const char*, const char*)") at assert.c:101

#8  0x000055a1fa42b1d4 in Field::set_warning_truncated_wrong_value (this=0x7ff758055be8, type_arg=0x55a1fb7bcd7e "string", value=0x7ff76906fbb0 "\\xA5\\xA5\\xA5\\xA5\\xA5\\xA5...") at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/field.cc:11173

#9  0x000055a1fa411355 in Field_longstr::check_string_copy_error (this=0x7ff758055be8, copier=0x7ff76906fc80, end=0x7ff7581f657d "U", cs=0x55a1fc86ec60 <my_charset_bin>) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/field.cc:7204

#10 0x000055a1fa4314e5 in Field_longstr::check_conversion_status (this=0x7ff758055be8, copier=0x7ff76906fc80, end=0x7ff7581f657d "U", cs=0x55a1fc86ec60 <my_charset_bin>, count_spaces=true) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/field.h:2168

#11 0x000055a1fa431634 in Field_longstr::well_formed_copy_with_check (this=0x7ff758055be8, to=0x7ff758064bd3 "\004test\002t2\001b", to_length=1020, from_cs=0x55a1fc86ec60 <my_charset_bin>, from=0x7ff7581ee586 "\004test\002t2\001b", from_length=32759, nchars=255, count_spaces=true, copy_length=0x7ff76906fcf8) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/field.h:2185

#12 0x000055a1fa4158df in Field_varstring::store (this=0x7ff758055be8, from=0x7ff7581ee586 "\004test\002t2\001b", length=32759, cs=0x55a1fc86ec60 <my_charset_bin>) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/field.cc:7828

#13 0x000055a1fa08ef8a in Field::store_text (this=0x7ff758055be8, to=0x7ff7581ee586 "\004test\002t2\001b", length=32759, cs=0x55a1fc86ec60 <my_charset_bin>) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/field.h:936

#14 0x000055a1fa186e17 in Histogram_json_hb::parse (this=0x7ff75805e760, mem_root=0x7ff758060ad8, field=0x7ff758055be8, type_arg=JSON_HB, hist_data=0x7ff758068318 "{\n  \"histogram_hb_v1\": [\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    \"\006\",\n    "..., hist_data_len=2580) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/opt_histogram_json.cc:200

#15 0x000055a1f9f452f8 in Column_stat::load_histogram (this=0x7ff769070f90, mem_root=0x7ff758060ad8) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_statistics.cc:1235

#16 0x000055a1f9f3b42b in read_histograms_for_table (thd=0x7ff758000db8, table=0x7ff758065068, stat_tables=0x7ff769071090) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_statistics.cc:3168

#17 0x000055a1f9f3bfa2 in read_statistics_for_tables (thd=0x7ff758000db8, tables=0x7ff7580158e8) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_statistics.cc:3305

#18 0x000055a1f9f3b63c in read_statistics_for_tables_if_needed (thd=0x7ff758000db8, tables=0x7ff7580158e8) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_statistics.cc:3214

#19 0x000055a1f9c2137e in open_and_lock_tables (thd=0x7ff758000db8, options=..., tables=0x7ff7580158e8, derived=true, flags=0, prelocking_strategy=0x7ff769073878) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_base.cc:5266

#20 0x000055a1f9b95521 in open_and_lock_tables (thd=0x7ff758000db8, tables=0x7ff7580158e8, derived=true, flags=0) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_base.h:509

#21 0x000055a1f9d8287d in execute_sqlcom_select (thd=0x7ff758000db8, all_tables=0x7ff7580158e8) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_parse.cc:6177

#22 0x000055a1f9d6f42a in mysql_execute_command (thd=0x7ff758000db8, is_called_from_prepared_stmt=false) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_parse.cc:3946

#23 0x000055a1f9d8c86c in mysql_parse (thd=0x7ff758000db8, rawbuf=0x7ff758015290 "SELECT * FROM t2", length=16, parser_state=0x7ff769074480) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_parse.cc:8030

#24 0x000055a1f9d62b0c in dispatch_command (command=COM_QUERY, thd=0x7ff758000db8, packet=0x7ff75800b849 "SELECT * FROM t2", packet_length=16, blocking=true) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_parse.cc:1896

#25 0x000055a1f9d5fba2 in do_command (thd=0x7ff758000db8, blocking=true) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_parse.cc:1404

#26 0x000055a1fa0c9493 in do_handle_one_connection (connect=0x55a1ff2ee8c8, put_in_cache=true) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_connect.cc:1418

#27 0x000055a1fa0c8c5b in handle_one_connection (arg=0x55a1ff2ed1f8) at /data/src/preview-10.7-MDEV-21130-json-histograms/sql/sql_connect.cc:1312

#28 0x000055a1fa9aaa83 in pfs_spawn_thread (arg=0x55a1ff2ee418) at /data/src/preview-10.7-MDEV-21130-json-histograms/storage/perfschema/pfs.cc:2201

#29 0x00007ff76ed31609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#30 0x00007ff76e904293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95