UBSAN : downcast of address X which does not point to an object of type 'multi_update' in sql/sql_update.cc | Sql_cmd_update::update_single_table

--source include/have_innodb.inc

CREATE TABLE t1(a INT) ENGINE=INNODB;

UPDATE t1 SET a = 10 RETURNING a ;

/test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_update.cc:1382:4: runtime error: downcast of address 0x52d00016ad88 which does not point to an object of type 'multi_update'

0x52d00016ad88: note: object is of type 'select_send'

 00 00 00 00  50 03 34 8d ca 5e 00 00  18 52 16 00 b0 52 00 00  00 00 00 00 00 00 00 00  00 00 00 00

              ^~~~~~~~~~~~~~~~~~~~~~~

              vptr for 'select_send'

    #0 0x5eca8b459925 in Sql_cmd_update::update_single_table(THD*) /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_update.cc:1382:4

    #1 0x5eca8b47fc23 in Sql_cmd_update::execute_inner(THD*) /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_update.cc:3288:10

    #2 0x5eca8b1a3bb4 in Sql_cmd_dml::execute(THD*) /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_select.cc:34849:9

    #3 0x5eca8aef0e42 in mysql_execute_command(THD*, bool) /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_parse.cc:4442:27

    #4 0x5eca8aed2b40 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_parse.cc:7937:18

    #5 0x5eca8aec9ca2 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_parse.cc:1896:7

    #6 0x5eca8aed4e06 in do_command(THD*, bool) /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_parse.cc:1432:17

    #7 0x5eca8b65bfcc in do_handle_one_connection(CONNECT*, bool) /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_connect.cc:1503:11

    #8 0x5eca8b65b826 in handle_one_connection /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_connect.cc:1415:5

    #9 0x5eca89cca20c in asan_thread_start(void*) crtstuff.c

    #10 0x7effa509caa3 in start_thread nptl/pthread_create.c:447:8

    #11 0x7effa5129c6b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

SUMMARY: UndefinedBehaviorSanitizer: dynamic-type-mismatch /test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_update.cc:1382:4

/test/mtest/MDEV-5092/bb-13.0-MDEV-5092_opt_san/sql/sql_update.cc:1382:29: runtime error: member call on address 0x52d00016ad88 which does not point to an object of type 'multi_update'