SET @qtype= @@global.query_cache_type;

SET GLOBAL query_cache_type= ON;

SET query_cache_type= ON;

--delimiter $

CREATE FUNCTION f() RETURNS INT

BEGIN

  DELETE FROM x;

  RETURN 1;

END $

--delimiter ;

CREATE TABLE t1 (a INT);

SELECT SQL_CACHE f() FROM t1;

# Cleanup

DROP FUNCTION f;

DROP TABLE t1;

SET GLOBAL query_cache_type= @qtype;

#3  <signal handler called>

#4  Query_cache::process_and_count_tables (this=0x561d4d4dcca0 <query_cache>, thd=0x7f18dc000d90, tables_used=0x7f18dc017628, tables_type=0x7f18ede2b613 "") at /data/src/10.4/sql/sql_cache.cc:4109

#5  0x0000561d4bccc5af in Query_cache::is_cacheable (this=0x561d4d4dcca0 <query_cache>, thd=0x7f18dc000d90, lex=0x7f18dc004c10, tables_used=0x7f18dc016428, tables_type=0x7f18ede2b613 "") at /data/src/10.4/sql/sql_cache.cc:4165

#6  0x0000561d4bcc4a7c in Query_cache::store_query (this=0x561d4d4dcca0 <query_cache>, thd=0x7f18dc000d90, tables_used=0x7f18dc016428) at /data/src/10.4/sql/sql_cache.cc:1408

#7  0x0000561d4bd5b598 in execute_sqlcom_select (thd=0x7f18dc000d90, all_tables=0x7f18dc016428) at /data/src/10.4/sql/sql_parse.cc:6445

#8  0x0000561d4bd51dca in mysql_execute_command (thd=0x7f18dc000d90) at /data/src/10.4/sql/sql_parse.cc:3965

#9  0x0000561d4bd5f5eb in mysql_parse (thd=0x7f18dc000d90, rawbuf=0x7f18dc0147a8 "SELECT SQL_CACHE f() FROM t1", length=28, parser_state=0x7f18ede2c4d0, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:7992

#10 0x0000561d4bd4b92b in dispatch_command (command=COM_QUERY, thd=0x7f18dc000d90, packet=0x7f18dc00ac01 "SELECT SQL_CACHE f() FROM t1", packet_length=28, is_com_multi=false, is_next_command=false) at /data/src/10.4/sql/sql_parse.cc:1857

#11 0x0000561d4bd4a191 in do_command (thd=0x7f18dc000d90) at /data/src/10.4/sql/sql_parse.cc:1373

#12 0x0000561d4bedb218 in do_handle_one_connection (connect=0x561d4ef81f20) at /data/src/10.4/sql/sql_connect.cc:1412

#13 0x0000561d4bedaf61 in handle_one_connection (arg=0x561d4ef81f20) at /data/src/10.4/sql/sql_connect.cc:1316

#14 0x0000561d4c908e46 in pfs_spawn_thread (arg=0x561d4ef5ad20) at /data/src/10.4/storage/perfschema/pfs.cc:1869

#15 0x00007f18f44c2609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#16 0x00007f18f4096293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

commit de745ecf29721795710910a19bd0ea3389da804c

Author: Oleksandr Byelkin

Date:   Tue May 22 19:08:39 2018 +0200

    MDEV-11953: support of brackets in UNION/EXCEPT/INTERSECT operations