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mariadb/mysql-test/t/parser_stack.test
Alexander Nozdrin 6facd4cb13 Patch for Bug#27863 (excessive memory usage for many small queries in a 
multiquery packet).

Background:

  - a query can contain multiple SQL statements;

  - the server frees resources allocated to process a query when the
    whole query is handled. In other words, resources allocated to process
    one SQL statement from a multi-statement query are freed when all SQL
    statements are handled.

The problem was that the parser allocated a buffer of size of the whole
query for each SQL statement in a multi-statement query. Thus, if a query
had many SQL-statements (so, the query was long), but each SQL statement
was short, ther parser tried to allocate huge amount of memory (number of
small SQL statements * length of the whole query).

The memory was allocated for a so-called "cpp buffer", which is intended to
store pre-processed SQL statement -- SQL text without version specific
comments.

The fix is to allocate memory for the "cpp buffer" once for all SQL
statements (once for a query).
2010-05-14 22:11:25 +04:00

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# Copyright (C) 2008 Sun Microsystems, Inc
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# These tests are designed to cause an internal parser stack overflow,
# and trigger my_yyoverflow().
#
use test;
SELECT
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
1
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
;
prepare stmt from
"
SELECT
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
1
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
"
;
execute stmt;
--disable_warnings
drop view if exists view_overflow;
--enable_warnings
CREATE VIEW view_overflow AS
SELECT
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
1
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
;
SELECT * from view_overflow;
drop view view_overflow;
--disable_warnings
drop procedure if exists proc_overflow;
--enable_warnings
delimiter $$;
CREATE PROCEDURE proc_overflow()
BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
select 1;
select 2;
select 3;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END $$
delimiter ;$$
call proc_overflow();
drop procedure proc_overflow;
--disable_warnings
drop function if exists func_overflow;
--enable_warnings
delimiter $$;
create function func_overflow() returns int
BEGIN
DECLARE x int default 0;
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
SET x=x+1;
SET x=x+2;
SET x=x+3;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
return x;
END $$
delimiter ;$$
select func_overflow();
drop function func_overflow;
--disable_warnings
drop table if exists table_overflow;
--enable_warnings
create table table_overflow(a int, b int);
delimiter $$;
create trigger trigger_overflow before insert on table_overflow
for each row
BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN BEGIN
SET NEW.b := NEW.a;
SET NEW.b := NEW.b + 1;
SET NEW.b := NEW.b + 2;
SET NEW.b := NEW.b + 3;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END; END; END; END; END; END; END; END; END; END; END; END;
END $$
delimiter ;$$
insert into table_overflow set a=10;
insert into table_overflow set a=20;
select * from table_overflow;
drop table table_overflow;
--disable_warnings
drop procedure if exists proc_35577;
--enable_warnings
delimiter $$;
CREATE PROCEDURE proc_35577()
BEGIN
DECLARE z_done INT DEFAULT 0;
DECLARE t_done VARCHAR(5000);
outer_loop: LOOP
IF t_done=1 THEN
LEAVE outer_loop;
END IF;
inner_block:BEGIN
DECLARE z_done INT DEFAULT 0;
SET z_done = 0;
inner_loop: LOOP
IF z_done=1 THEN
LEAVE inner_loop;
END IF;
IF (t_done = 'a') THEN
IF (t_done <> 0) THEN
IF ( t_done > 0) THEN
IF (t_done = 'a') THEN
SET t_done = 'a';
ELSEIF (t_done = 'a') THEN
SET t_done = 'a';
ELSEIF(t_done = 'a') THEN
SET t_done = 'a';
ELSEIF(t_done = 'a') THEN
SET t_done = 'a';
ELSEIF(t_done = 'a') THEN
SET t_done = 'a';
ELSEIF(t_done = 'a') THEN
SET t_done = 'a';
ELSEIF(t_done = 'a') THEN
SET t_done = 'a';
ELSEIF(t_done = 'a') THEN
SET t_done = 'a';
END IF;
END IF;
END IF;
END IF;
END LOOP inner_loop;
END inner_block;
END LOOP outer_loop;
END $$
delimiter ;$$
drop procedure proc_35577;
#
# Bug#37269 (parser crash when creating stored procedure)
#
--disable_warnings
drop procedure if exists p_37269;
--enable_warnings
delimiter $$;
create procedure p_37269()
begin
declare done int default 0;
declare varb int default 0;
declare vara int default 0;
repeat
select now();
until done end repeat;
while varb do
select now();
begin
select now();
repeat
select now();
until done end repeat;
if vara then
select now();
repeat
select now();
loop
select now();
end loop;
repeat
select now();
label1: while varb do
select now();
end while label1;
if vara then
select now();
repeat
select now();
until done end repeat;
begin
select now();
while varb do
select now();
label1: while varb do
select now();
end while label1;
if vara then
select now();
while varb do
select now();
loop
select now();
end loop;
repeat
select now();
loop
select now();
while varb do
select now();
end while;
repeat
select now();
label1: loop
select now();
if vara then
select now();
end if;
end loop label1;
until done end repeat;
end loop;
until done end repeat;
end while;
end if;
end while;
end;
end if;
until done end repeat;
until done end repeat;
end if;
end;
end while;
end $$
delimiter ;$$
drop procedure p_37269;
#
# Bug#37228 (Sever crashes when creating stored procedure with more than
# 10 IF/ELSEIF)
#
--disable_warnings
drop procedure if exists p_37228;
--enable_warnings
delimiter $$;
create procedure p_37228 ()
BEGIN
DECLARE v INT DEFAULT 123;
IF (v > 1) THEN SET v = 1;
ELSEIF (v < 10) THEN SET v = 10;
ELSEIF (v < 11) THEN SET v = 11;
ELSEIF (v < 12) THEN SET v = 12;
ELSEIF (v < 13) THEN SET v = 13;
ELSEIF (v < 14) THEN SET v = 14;
ELSEIF (v < 15) THEN SET v = 15;
ELSEIF (v < 16) THEN SET v = 16;
ELSEIF (v < 17) THEN SET v = 17;
ELSEIF (v < 18) THEN SET v = 18;
ELSEIF (v < 19) THEN SET v = 19;
ELSEIF (v < 20) THEN SET v = 20;
ELSEIF (v < 21) THEN SET v = 21;
ELSEIF (v < 22) THEN SET v = 22;
ELSEIF (v < 23) THEN SET v = 23;
ELSEIF (v < 24) THEN SET v = 24;
ELSEIF (v < 25) THEN SET v = 25;
ELSEIF (v < 26) THEN SET v = 26;
ELSEIF (v < 27) THEN SET v = 27;
ELSEIF (v < 28) THEN SET v = 28;
ELSEIF (v < 29) THEN SET v = 29;
ELSEIF (v < 30) THEN SET v = 30;
ELSEIF (v < 31) THEN SET v = 31;
ELSEIF (v < 32) THEN SET v = 32;
ELSEIF (v < 33) THEN SET v = 33;
ELSEIF (v < 34) THEN SET v = 34;
ELSEIF (v < 35) THEN SET v = 35;
ELSEIF (v < 36) THEN SET v = 36;
ELSEIF (v < 37) THEN SET v = 37;
ELSEIF (v < 38) THEN SET v = 38;
ELSEIF (v < 39) THEN SET v = 39;
END IF;
END $$
delimiter ;$$
drop procedure p_37228;
#
# Bug#27863 (excessive memory usage for many small queries in a multiquery
# packet).
#
let $i=`select repeat("set @a=1;", 65535)`;
--disable_query_log
eval $i;
--enable_query_log
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