EVOLUTION-MANAGER

Edit File: delete_use_source.test

--source include/have_sequence.inc
--source include/have_innodb.inc
create table t1(c1 integer not null,c2 integer not null, key (c1)) engine=InnoDb;
create view v1 as select * from t1 where c1 in (0,1);

insert t1 select 0,seq from seq_1_to_500;
insert t1 select 1,seq from seq_1_to_100;
insert t1 select 2,seq from seq_1_to_50;
insert t1 select 3,seq from seq_1_to_20;
analyze table t1;

--echo #
--echo # Delete with limit (quick select - range acces)
--echo #

start transaction;
--enable_info
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 limit 1;
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 limit 1;
--disable_info
select count(*) from v1 where c1=0;
rollback;

--echo #
--echo # Delete
--echo #

start transaction;
--enable_info ONCE
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 ;
rollback;

--echo #
--echo # Delete with exists
--echo #

start transaction;
select count(*) from v1 where c1=2;
--enable_info
delete from t1 where c1=2 and exists(select 'x' from t1 b where b.c2<10);
delete from t1 where c1=2 and exists(select 'x' from t1 b where b.c2<10);
--disable_info
select count(*) from v1 where c1=2;
rollback;

--echo #
--echo # Delete through a view with limit (range access)
--echo #

start transaction;
explain delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
--enable_info
delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
--disable_info
select count(*) from v1 where c1=0;
rollback;

--echo #
--echo # Delete through a view (ALL access)
--echo #

start transaction;
explain delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500;
--enable_info ONCE
delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 ;
select count(*) from v1 where c1=0;
rollback;

--echo #
--echo # Delete failed due to trigger
--echo #

delimiter /;
create trigger trg after delete on t1 for each row
begin
  declare c int;
  begin
  if old.c1 = 1 then
    select count(*) into c from t1 where c1!=old.c1;
    SIGNAL SQLSTATE '45000' set table_name=c;
  end if;
  end;
end;
/
delimiter ;/

start transaction;
--error ER_SIGNAL_EXCEPTION
delete from t1 where c1=1 and (select count(*) from t1 b where b.c1=t1.c1) > 0 order by c2 asc limit 10;
rollback;
start transaction;
--error ER_SIGNAL_EXCEPTION
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) > 0 order by c1 desc limit 100;
select c1,count(*) from t1 group by c1;
rollback;

drop trigger trg;

--echo #
--echo # Delete through a view with returning
--echo #

start transaction;
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 order by c2 asc limit 10 returning c1,c2;
rollback;
start transaction;
delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 order by c2 desc limit 10 returning c1,c2;
rollback;

drop view v1;
drop table t1;

--echo #
--echo # Delete from table with more than 150000 rows
--echo #
create table t1(c1 integer not null,c2 integer not null, key (c1));
insert t1 select 0,seq from seq_1_to_128000;
insert t1 select 1,seq from seq_1_to_25600;
select count(*) from t1;

--echo # with a lot of memory for sort_buffer_size
set session sort_buffer_size = 1024000;
--enable_info ONCE
delete from t1 where c1=0 and exists(select 'x' from t1 b where b.c1<10);

--echo # with little memory for sort_buffer_size
insert t1 select 0,seq from seq_1_to_128000;
set session sort_buffer_size = 1024;
--enable_info ONCE
delete from t1 where c1=0 and exists(select 'x' from t1 b where b.c1<10);

drop table t1;