Assertion `strncmp(str->ptr() + str->length() - 5, "cast(", 5) == 0' failed in Item_dyncol_get::print

CREATE TABLE t1 (a INT) ENGINE=InnoDB;

--connect (con1,localhost,root,,test)

--let $conid= `select connection_id()`

--delimiter $

--send

  BEGIN NOT ATOMIC

    DECLARE CONTINUE HANDLER FOR 1054 BEGIN END;

    LOOP

      SELECT * FROM t1 WHERE x = 1;

    END LOOP;

  END $

--delimiter ;

--connection default

--let $run= 10000

while ($run)

{

  SELECT * FROM t1 WHERE COLUMN_GET( COLUMN_CREATE( 1, 2 ), 3 AS INT );

  --dec $run

}

# Cleanup

--eval KILL $conid

DROP TABLE t1;

mysqld: /data/src/10.2/sql/item_strfunc.cc:5194: virtual void Item_dyncol_get::print(String*, enum_query_type): Assertion `strncmp(str->ptr() + str->length() - 5, "cast(", 5) == 0' failed.

200723 19:34:18 [ERROR] mysqld got signal 6 ;

#7  0x00007f7e56e48f12 in __GI___assert_fail (assertion=0x55dcf59f0a40 "strncmp(str->ptr() + str->length() - 5, \"cast(\", 5) == 0", file=0x55dcf59f0520 "/data/src/10.2/sql/item_strfunc.cc", line=5194, function=0x55dcf59f2200 <Item_dyncol_get::print(String*, enum_query_type)::__PRETTY_FUNCTION__> "virtual void Item_dyncol_get::print(String*, enum_query_type)") at assert.c:101

#8  0x000055dcf51ad52f in Item_dyncol_get::print (this=0x7f7e40013030, str=0x7f7e5117b280, query_type=QT_EXPLAIN) at /data/src/10.2/sql/item_strfunc.cc:5194

#9  0x000055dcf516d719 in Item_func_signed::print (this=0x7f7e400130f0, str=0x7f7e5117b280, query_type=QT_EXPLAIN) at /data/src/10.2/sql/item_func.cc:1079

#10 0x000055dcf51272d3 in dbug_print_item (item=0x7f7e400130f0) at /data/src/10.2/sql/item.cc:10835

#11 0x000055dcf4eb93cd in JOIN::prepare (this=0x7f7e40013298, tables_init=0x7f7e400126a0, wild_num=1, conds_init=0x7f7e400130f0, og_num=0, order_init=0x0, skip_order_by=false, group_init=0x0, having_init=0x0, proc_param_init=0x0, select_lex_arg=0x7f7e40004e28, unit_arg=0x7f7e400046e8) at /data/src/10.2/sql/sql_select.cc:711

#12 0x000055dcf4ec437c in mysql_select (thd=0x7f7e40000af0, tables=0x7f7e400126a0, wild_num=1, fields=..., conds=0x7f7e400130f0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7f7e40013278, unit=0x7f7e400046e8, select_lex=0x7f7e40004e28) at /data/src/10.2/sql/sql_select.cc:3811

#13 0x000055dcf4eb85ec in handle_select (thd=0x7f7e40000af0, lex=0x7f7e40004628, result=0x7f7e40013278, setup_tables_done_option=0) at /data/src/10.2/sql/sql_select.cc:361

#14 0x000055dcf4e84036 in execute_sqlcom_select (thd=0x7f7e40000af0, all_tables=0x7f7e400126a0) at /data/src/10.2/sql/sql_parse.cc:6218

#15 0x000055dcf4e7a8b7 in mysql_execute_command (thd=0x7f7e40000af0) at /data/src/10.2/sql/sql_parse.cc:3524

#16 0x000055dcf4e87d6d in mysql_parse (thd=0x7f7e40000af0, rawbuf=0x7f7e40012458 "SELECT * FROM t1 WHERE COLUMN_GET( COLUMN_CREATE( 1, 2 ), 3 AS INT )", length=68, parser_state=0x7f7e5117c610, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:7733

#17 0x000055dcf4e76099 in dispatch_command (command=COM_QUERY, thd=0x7f7e40000af0, packet=0x7f7e4008d451 "SELECT * FROM t1 WHERE COLUMN_GET( COLUMN_CREATE( 1, 2 ), 3 AS INT )", packet_length=68, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:1824

#18 0x000055dcf4e74b14 in do_command (thd=0x7f7e40000af0) at /data/src/10.2/sql/sql_parse.cc:1377

#19 0x000055dcf4fcaaef in do_handle_one_connection (connect=0x55dcf7f77ca0) at /data/src/10.2/sql/sql_connect.cc:1336

#20 0x000055dcf4fca85a in handle_one_connection (arg=0x55dcf7f77ca0) at /data/src/10.2/sql/sql_connect.cc:1241

#21 0x000055dcf57e0f12 in pfs_spawn_thread (arg=0x55dcf7ec4a70) at /data/src/10.2/storage/perfschema/pfs.cc:1869

#22 0x00007f7e58dd14a4 in start_thread (arg=0x7f7e5117d700) at pthread_create.c:456

#23 0x00007f7e56f05d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97