Some connect engine tests fail with LeakSanitizer errors

$ perl ./mtr connect.bson

connect.bson                             [ pass ]    235

***Warnings generated in error logs during shutdown after running tests: connect.bson

==1298428==ERROR: LeakSanitizer: detected memory leaks

SUMMARY: AddressSanitizer: 12277 byte(s) leaked in 2 allocation(s).

Exception 666: Cannot write expanded column when Pretty is not 2

=================================================================

==1298428==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 9432 byte(s) in 1 object(s) allocated from:

    #0 0x74c45d in operator new(unsigned long) (/mnt8t/bld/10.3-asan-nightly/bin/mysqld+0x74c45d)

    #1 0x7f4c903b8068  (<unknown module>)

    #2 0x7f4c90574715  (<unknown module>)

    #3 0x7f4c902c7629  (<unknown module>)

    #4 0x7f4c902bdc7b  (<unknown module>)

    #5 0x7f4c9027d06e  (<unknown module>)

    #6 0x7f4c90297795  (<unknown module>)

    #7 0xde7013 in get_schema_stat_record(THD*, TABLE_LIST*, TABLE*, bool, st_mysql_const_lex_string const*, st_mysql_const_lex_string const*) /data/src/10.3/sql/sql_show.cc:6722:25

    #8 0xdaca44 in fill_schema_table_by_open(THD*, st_mem_root*, bool, TABLE*, st_schema_table*, st_mysql_const_lex_string*, st_mysql_const_lex_string*, Open_tables_backup*, bool) /data/src/10.3/sql/sql_show.cc:4707:13

    #9 0xdaa0ce in get_all_tables(THD*, TABLE_LIST*, Item*) /data/src/10.3/sql/sql_show.cc:5217:12

    #10 0xdd6759 in get_schema_tables_result(JOIN*, enum_schema_table_state) /data/src/10.3/sql/sql_show.cc:9030:11

    #11 0xcc3398 in JOIN::exec_inner() /data/src/10.3/sql/sql_select.cc:4134:7

    #12 0xcc084e in JOIN::exec() /data/src/10.3/sql/sql_select.cc:3965:3

    #13 0xc334dc in mysql_select(THD*, TABLE_LIST*, unsigned int, 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/src/10.3/sql/sql_select.cc:4374:9

    #14 0xc320c4 in handle_select(THD*, LEX*, select_result*, unsigned long) /data/src/10.3/sql/sql_select.cc:372:10

    #15 0xb7078d in execute_sqlcom_select(THD*, TABLE_LIST*) /data/src/10.3/sql/sql_parse.cc:6340:12

    #16 0xb53417 in mysql_execute_command(THD*) /data/src/10.3/sql/sql_parse.cc:3871:12

    #17 0xb42fc6 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.3/sql/sql_parse.cc:7871:18

    #18 0xb33b4c in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.3/sql/sql_parse.cc:1852:7

    #19 0xb3ce4c in do_command(THD*) /data/src/10.3/sql/sql_parse.cc:1398:17

    #20 0x1083096 in do_handle_one_connection(CONNECT*) /data/src/10.3/sql/sql_connect.cc:1403:11

    #21 0x1082763 in handle_one_connection /data/src/10.3/sql/sql_connect.cc:1308:3

    #22 0x2e99121 in pfs_spawn_thread /data/src/10.3/storage/perfschema/pfs.cc:1869:3

    #23 0x7f4c9884dea6 in start_thread nptl/pthread_create.c:477:8

Indirect leak of 2845 byte(s) in 1 object(s) allocated from:

    #0 0x71c7bd in malloc (/mnt8t/bld/10.3-asan-nightly/bin/mysqld+0x71c7bd)

    #1 0x7f4c903b8618  (<unknown module>)

    #2 0x7f4c903b8420  (<unknown module>)

    #3 0x7f4c90574715  (<unknown module>)

    #4 0x7f4c902c7629  (<unknown module>)

    #5 0x7f4c902bdc7b  (<unknown module>)

    #6 0x7f4c9027d06e  (<unknown module>)

    #7 0x7f4c90297795  (<unknown module>)

    #8 0xde7013 in get_schema_stat_record(THD*, TABLE_LIST*, TABLE*, bool, st_mysql_const_lex_string const*, st_mysql_const_lex_string const*) /data/src/10.3/sql/sql_show.cc:6722:25

    #9 0xdaca44 in fill_schema_table_by_open(THD*, st_mem_root*, bool, TABLE*, st_schema_table*, st_mysql_const_lex_string*, st_mysql_const_lex_string*, Open_tables_backup*, bool) /data/src/10.3/sql/sql_show.cc:4707:13

    #10 0xdaa0ce in get_all_tables(THD*, TABLE_LIST*, Item*) /data/src/10.3/sql/sql_show.cc:5217:12

    #11 0xdd6759 in get_schema_tables_result(JOIN*, enum_schema_table_state) /data/src/10.3/sql/sql_show.cc:9030:11

    #12 0xcc3398 in JOIN::exec_inner() /data/src/10.3/sql/sql_select.cc:4134:7

    #13 0xcc084e in JOIN::exec() /data/src/10.3/sql/sql_select.cc:3965:3

    #14 0xc334dc in mysql_select(THD*, TABLE_LIST*, unsigned int, 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/src/10.3/sql/sql_select.cc:4374:9

    #15 0xc320c4 in handle_select(THD*, LEX*, select_result*, unsigned long) /data/src/10.3/sql/sql_select.cc:372:10

    #16 0xb7078d in execute_sqlcom_select(THD*, TABLE_LIST*) /data/src/10.3/sql/sql_parse.cc:6340:12

    #17 0xb53417 in mysql_execute_command(THD*) /data/src/10.3/sql/sql_parse.cc:3871:12

    #18 0xb42fc6 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/src/10.3/sql/sql_parse.cc:7871:18

    #19 0xb33b4c in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/src/10.3/sql/sql_parse.cc:1852:7

    #20 0xb3ce4c in do_command(THD*) /data/src/10.3/sql/sql_parse.cc:1398:17

    #21 0x1083096 in do_handle_one_connection(CONNECT*) /data/src/10.3/sql/sql_connect.cc:1403:11

    #22 0x1082763 in handle_one_connection /data/src/10.3/sql/sql_connect.cc:1308:3

    #23 0x2e99121 in pfs_spawn_thread /data/src/10.3/storage/perfschema/pfs.cc:1869:3

    #24 0x7f4c9884dea6 in start_thread nptl/pthread_create.c:477:8

SUMMARY: AddressSanitizer: 12277 byte(s) leaked in 2 allocation(s).