CREATE TABLE t1 (c1 CHAR(8));

INSERT INTO t1 VALUES ('10'),('-10');

CREATE TABLE t2 (c2 CHAR);

SET @a= CAST('10' AS CHAR);

SELECT c1 FROM t1 UNION SELECT - @a FROM t2;

2017-07-02 20:48:12 139766304167680 [ERROR] mysqld: Table '/data/bld/10.3/mysql-test/var/tmp/mysqld.1/#sql_1f02_0' is marked as crashed and should be repaired

mysqld: /data/src/10.3/storage/maria/ma_open.c:1369: _ma_state_info_write: Assertion `(&(&share->intern_lock)->m_mutex)->count > 0 && pthread_equal(pthread_self(), (&(&share->intern_lock)->m_mutex)->thread)' failed.

170702 20:48:12 [ERROR] mysqld got signal 6 ;

#7  0x00007f1de6bfdee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6

#8  0x0000563e55783d47 in _ma_state_info_write (share=0x7f1dd0062650, pWrite=1) at /data/src/10.3/storage/maria/ma_open.c:1369

#9  0x0000563e557c5b6c in maria_close (info=0x7f1dd00636b0) at /data/src/10.3/storage/maria/ma_close.c:146

#10 0x0000563e5574221a in ha_maria::close (this=0x7f1dd0041d78) at /data/src/10.3/storage/maria/ha_maria.cc:1274

#11 0x0000563e5553e293 in handler::ha_close (this=0x7f1dd0041d78) at /data/src/10.3/sql/handler.cc:2544

#12 0x0000563e55746754 in ha_maria::drop_table (this=0x7f1dd0041d78, name=0x7f1dd007f0c8 "/data/bld/10.3/mysql-test/var/tmp/mysqld.1/#sql_1f02_0") at /data/src/10.3/storage/maria/ha_maria.cc:2680

#13 0x0000563e55542b68 in handler::ha_drop_table (this=0x7f1dd0041d78, name=0x7f1dd007f0c8 "/data/bld/10.3/mysql-test/var/tmp/mysqld.1/#sql_1f02_0") at /data/src/10.3/sql/handler.cc:4325

#14 0x0000563e552f7415 in free_tmp_table (thd=0x7f1dd0000b00, entry=0x7f1dd007de08) at /data/src/10.3/sql/sql_select.cc:17779

#15 0x0000563e55371a2f in st_select_lex_unit::cleanup (this=0x7f1dd0004698) at /data/src/10.3/sql/sql_union.cc:1760

#16 0x0000563e5536bf8b in mysql_union (thd=0x7f1dd0000b00, lex=0x7f1dd00045d0, result=0x7f1dd0016218, unit=0x7f1dd0004698, setup_tables_done_option=0) at /data/src/10.3/sql/sql_union.cc:42

#17 0x0000563e552c76b0 in handle_select (thd=0x7f1dd0000b00, lex=0x7f1dd00045d0, result=0x7f1dd0016218, setup_tables_done_option=0) at /data/src/10.3/sql/sql_select.cc:351

#18 0x0000563e552938b5 in execute_sqlcom_select (thd=0x7f1dd0000b00, all_tables=0x7f1dd0014b10) at /data/src/10.3/sql/sql_parse.cc:6476

#19 0x0000563e55289c43 in mysql_execute_command (thd=0x7f1dd0000b00) at /data/src/10.3/sql/sql_parse.cc:3590

#20 0x0000563e55297306 in mysql_parse (thd=0x7f1dd0000b00, rawbuf=0x7f1dd00148e8 "SELECT c1 FROM t1 UNION SELECT - @a FROM t2", length=43, parser_state=0x7f1de0e94200, is_com_multi=false, is_next_command=false) at /data/src/10.3/sql/sql_parse.cc:7932

#21 0x0000563e55284f93 in dispatch_command (command=COM_QUERY, thd=0x7f1dd0000b00, packet=0x7f1dd0088521 "", packet_length=43, is_com_multi=false, is_next_command=false) at /data/src/10.3/sql/sql_parse.cc:1822

#22 0x0000563e5528390d in do_command (thd=0x7f1dd0000b00) at /data/src/10.3/sql/sql_parse.cc:1380

#23 0x0000563e553d17e4 in do_handle_one_connection (connect=0x563e58852bb0) at /data/src/10.3/sql/sql_connect.cc:1354

#24 0x0000563e553d1571 in handle_one_connection (arg=0x563e58852bb0) at /data/src/10.3/sql/sql_connect.cc:1260

#25 0x0000563e5582eb2f in pfs_spawn_thread (arg=0x563e587ada60) at /data/src/10.3/storage/perfschema/pfs.cc:1862

#26 0x00007f1de8b42494 in start_thread (arg=0x7f1de0e95700) at pthread_create.c:333

#27 0x00007f1de6cba93f in clone () from /lib/x86_64-linux-gnu/libc.so.6