#3  <signal handler called>

#4  0x000000000067366f in st_join_table::get_examined_rows (this=0x1f81798)

    at /home/elenst/5.5-timour/sql/sql_select.cc:10260

#5  0x000000000066ad65 in JOIN::get_examined_rows (this=0x1f7dd30)

    at /home/elenst/5.5-timour/sql/sql_select.cc:6630

#6  0x0000000000867ee1 in Item_subselect::is_expensive (this=0x1f79bd0)

    at /home/elenst/5.5-timour/sql/item_subselect.cc:560

#7  0x000000000067566c in check_simple_equality (left_item=0x1f588a8, 

    right_item=0x1f79bd0, item=0x1f79d48, cond_equal=0x7f9bf69b0560)

    at /home/elenst/5.5-timour/sql/sql_select.cc:11247

#8  0x0000000000675d78 in check_equality (thd=0x1e66ac0, item=0x1f79d48, 

    cond_equal=0x7f9bf69b0560, eq_list=0x7f9bf69b05e0)

    at /home/elenst/5.5-timour/sql/sql_select.cc:11428

#9  0x00000000006761c8 in build_equal_items_for_cond (thd=0x1e66ac0, cond=0x1f79d48, 

    inherited=0x0) at /home/elenst/5.5-timour/sql/sql_select.cc:11594

#10 0x00000000006765cc in build_equal_items (thd=0x1e66ac0, cond=0x1f79d48, 

    inherited=0x0, join_list=0x1e69688, cond_equal_ref=0x1f7a390)

    at /home/elenst/5.5-timour/sql/sql_select.cc:11726

#11 0x00000000006797c3 in optimize_cond (join=0x1f79f88, conds=0x1f79d48, 

    join_list=0x1e69688, cond_value=0x1f7a270, cond_equal=0x1f7a390)

    at /home/elenst/5.5-timour/sql/sql_select.cc:13195

#12 0x000000000065ab36 in JOIN::optimize (this=0x1f79f88)

    at /home/elenst/5.5-timour/sql/sql_select.cc:1060

#13 0x0000000000661a94 in mysql_select (thd=0x1e66ac0, rref_pointer_array=0x1e69770, 

    tables=0x1f582c0, wild_num=1, fields=..., conds=0x1f79d48, og_num=0, order=0x0, 

    group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x1f79f68, 

    unit=0x1e68e40, select_lex=0x1e69518)

    at /home/elenst/5.5-timour/sql/sql_select.cc:3004

#14 0x0000000000658902 in handle_select (thd=0x1e66ac0, lex=0x1e68d90, result=0x1f79f68, 

    setup_tables_done_option=0) at /home/elenst/5.5-timour/sql/sql_select.cc:310

#15 0x0000000000632258 in execute_sqlcom_select (thd=0x1e66ac0, all_tables=0x1f582c0)

    at /home/elenst/5.5-timour/sql/sql_parse.cc:4616

#16 0x000000000062b2bb in mysql_execute_command (thd=0x1e66ac0)

    at /home/elenst/5.5-timour/sql/sql_parse.cc:2184

#17 0x0000000000634a7b in mysql_parse (thd=0x1e66ac0, 

    rawbuf=0x1f58048 "SELECT * FROM A \nWHERE a1 = ( \nSELECT COUNT(*) FROM A \nWHERE a1 IN ( SELECT a1 FROM A, B )\n)", length=92, parser_state=0x7f9bf69b1600)

    at /home/elenst/5.5-timour/sql/sql_parse.cc:5731

#18 0x0000000000628929 in dispatch_command (command=COM_QUERY, thd=0x1e66ac0, 

    packet=0x1fe7cc1 "SELECT * FROM A \nWHERE a1 = ( \nSELECT COUNT(*) FROM A \nWHERE a1 IN ( SELECT a1 FROM A, B )\n)", packet_length=92)

    at /home/elenst/5.5-timour/sql/sql_parse.cc:1055

#19 0x0000000000627bfc in do_command (thd=0x1e66ac0)

    at /home/elenst/5.5-timour/sql/sql_parse.cc:794

#20 0x0000000000723eed in do_handle_one_connection (thd_arg=0x1e66ac0)

    at /home/elenst/5.5-timour/sql/sql_connect.cc:1253

#21 0x00000000007239b0 in handle_one_connection (arg=0x1e66ac0)

    at /home/elenst/5.5-timour/sql/sql_connect.cc:1168

revision-id: timour@askmonty.org-20120517104605-5s2rh8r8840gvgs4

date: 2012-05-17 13:46:05 +0300

revno: 3403

SET optimizer_switch = 'materialization=on,semijoin=on';

CREATE TABLE A (a1 INT);

INSERT INTO A VALUES (4),(6);

CREATE TABLE B (b1 INT);

INSERT INTO B VALUES (1),(7);

SELECT * FROM A

WHERE a1 = ( 

  SELECT COUNT(*) FROM A 

  WHERE a1 IN ( SELECT a1 FROM A, B )

);