Also, I'm getting a crash when trying to debug a slightly complex example: delimiter | CREATE FUNCTION f10(param1 VARCHAR(11)) RETURNS TABLE return_table(name VARCHAR(11)) deterministic BEGIN insert into return_table values('foo'); END| DELIMITER ; select name from f21('aaa') where name like '%foo%'; Causes a crash: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7ffff7efa700 (LWP 5142)] 0x0000555555cb6000 in Item_field::fix_fields (this=0x7fff80006db8, thd=0x555558161ca0, reference=0x7fff80007070) at /home/psergey/dev-git/10.1-gsoc-repo/sql/item.cc:4928 (gdb) wher #0 0x0000555555cb6000 in Item_field::fix_fields (this=0x7fff80006db8, thd=0x555558161ca0, reference=0x7fff80007070) at /home/psergey/dev-git/10.1-gsoc-repo/sql/item.cc:4928 #1 0x0000555555cf86e8 in Item_func::fix_fields (this=0x7fff80006fe0, thd=0x555558161ca0, ref=0x7fff8000b060) at /home/psergey/dev-git/10.1-gsoc-repo/sql/item_func.cc:208 #2 0x0000555555cd9747 in Item_func_like::fix_fields (this=0x7fff80006fe0, thd=0x555558161ca0, ref=0x7fff8000b060) at /home/psergey/dev-git/10.1-gsoc-repo/sql/item_cmpfunc.cc:4856 #3 0x00005555559ff1b0 in setup_conds (thd=0x555558161ca0, tables=0x7fff80006780, leaves=..., conds=0x7fff8000b060) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_base.cc:8657 #4 0x0000555555aeb4f7 in setup_without_group (thd=0x555558161ca0, ref_pointer_array=0x7fff8000b198, tables=0x7fff80006780, leaves=..., fields=..., all_fields=..., conds=0x7fff8000b060, order=0x0, group=0x0, hidden_group_fields=0x7fff8000af40, reserved=0x555558165ffc) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_select.cc:631 #5 0x0000555555aa6d99 in JOIN::prepare (this=0x7fff8000ac48, rref_pointer_array=0x555558165fd8, tables_init=0x7fff80006780, wild_num=0, conds_init=0x7fff80006fe0, og_num=0, order_init=0x0, skip_order_by=false, group_init=0x0, having_init=0x0, proc_param_init=0x0, select_lex_arg=0x555558165d60, unit_arg=0x555558165660) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_select.cc:786 #6 0x0000555555aafcab in mysql_select (thd=0x555558161ca0, rref_pointer_array=0x555558165fd8, tables=0x7fff80006780, wild_num=0, fields=..., conds=0x7fff80006fe0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x7fff8000ac28, unit=0x555558165660, select_lex=0x555558165d60) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_select.cc:3301 #7 0x0000555555aa5fd7 in handle_select (thd=0x555558161ca0, lex=0x555558165598, result=0x7fff8000ac28, setup_tables_done_option=0) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_select.cc:371 #8 0x0000555555a65fbf in execute_sqlcom_select (thd=0x555558161ca0, all_tables=0x7fff80006780) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_parse.cc:5799 #9 0x0000555555a5c25f in mysql_execute_command (thd=0x555558161ca0) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_parse.cc:2939 #10 0x0000555555a69554 in mysql_parse (thd=0x555558161ca0, rawbuf=0x7fff800064a8 "select name from f21('aaa') where name like '%foo%'", length=51, parser_state=0x7ffff7ef90f0) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_parse.cc:7175 #11 0x0000555555a584a7 in dispatch_command (command=COM_QUERY, thd=0x555558161ca0, packet=0x555558168ef1 "select name from f21('aaa') where name like '%foo%'", packet_length=51) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_parse.cc:1470 #12 0x0000555555a571c1 in do_command (thd=0x555558161ca0) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_parse.cc:1093 #13 0x0000555555b95b3d in do_handle_one_connection (thd_arg=0x555558161ca0) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_connect.cc:1347 #14 0x0000555555b95882 in handle_one_connection (arg=0x555558161ca0) at /home/psergey/dev-git/10.1-gsoc-repo/sql/sql_connect.cc:1258 #15 0x00007ffff691de9a in start_thread (arg=0x7ffff7efa700) at pthread_create.c:308 #16 0x00007ffff604e3fd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 #17 0x0000000000000000 in ?? () (gdb) I am nut sure about the cause of this. It needs to be investigated. BR Sergei -- Sergei Petrunia, Software Developer MariaDB Corporation | Skype: sergefp | Blog: http://s.petrunia.net/blog