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MDEV-12137 DELETE statement with the same source and target
single-table deletes only
This commit is contained in:
halfspawn
committed by
Sergei Golubchik
Sergei Golubchik
parent
30fee6150a
commit
abf95afa2a
178
mysql-test/r/delete_use_source.result
Normal file
178
mysql-test/r/delete_use_source.result
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@ -0,0 +1,178 @@
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set sql_mode=oracle;
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use test;
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create or replace table tab_delete(c1 integer not null,c2 integer not null) engine=InnoDb;
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create index tab_delete_c1 on tab_delete(c1);
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create or replace view view_delete as select * from tab_delete where c1 in (0,1);
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CREATE or replace PROCEDURE gendata(a int, count int ) AS
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i INT:=0;
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BEGIN
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FOR i IN 1 .. count
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LOOP
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insert into tab_delete values (a,i);
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END LOOP;
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END;
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/
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create or replace trigger trg after delete on tab_delete for each row
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begin
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declare c int;
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begin
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if old.c1 = 1 then
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select count(*) into c from tab_delete where c1!=old.c1;
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SIGNAL SQLSTATE '45000' set table_name=c;
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end if;
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end;
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end;
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/
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set @count=500;
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call gendata(0,@count);
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call gendata(1,50);
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call gendata(2,20);
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call gendata(3,20);
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commit;
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#
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# Delete with limit (quick select - range acces)
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#
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start transaction;
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delete from tab_delete where (select count(*) from tab_delete b where b.c1=tab_delete.c1) = 500 limit 1;
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affected rows: 1
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delete from tab_delete where (select count(*) from tab_delete b where b.c1=tab_delete.c1) = 500 limit 1;
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affected rows: 0
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select count(*) from view_delete where c1=0;
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count(*)
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499
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rollback;
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#
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# Delete
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#
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start transaction;
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delete from tab_delete where (select count(*) from tab_delete b where b.c1=tab_delete.c1) = 500 ;
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affected rows: 500
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rollback;
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#
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# Delete with exists
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#
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start transaction;
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select count(*) from view_delete where c1=2;
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count(*)
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0
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delete from tab_delete where c1=2 and exists(select 'x' from tab_delete b where b.c2<10);
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affected rows: 20
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delete from tab_delete where c1=2 and exists(select 'x' from tab_delete b where b.c2<10);
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affected rows: 0
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select count(*) from view_delete where c1=2;
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count(*)
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0
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rollback;
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#
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# Delete throw a view with limit (range access)
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#
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start transaction;
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# Acces by range (quick_select), initied = INDEX
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# +------+--------------------+------------+-------+---------------+---------------+---------+--------------------+------+-------------+
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# | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
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# +------+--------------------+------------+-------+---------------+---------------+---------+--------------------+------+-------------+
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# | 1 | PRIMARY | tab_delete | range | tab_delete_c1 | tab_delete_c1 | 4 | NULL | 550 | Using where |
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# | 2 | DEPENDENT SUBQUERY | b | ref | tab_delete_c1 | tab_delete_c1 | 4 | test.tab_delete.c1 | 73 | Using index |
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# +------+--------------------+------------+-------+---------------+---------------+---------+--------------------+------+-------------+
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delete from view_delete where (select count(*) from tab_delete b where b.c1=view_delete.c1) = 500 limit 1;
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affected rows: 1
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delete from view_delete where (select count(*) from tab_delete b where b.c1=view_delete.c1) = 500 limit 1;
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affected rows: 0
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select count(*) from view_delete where c1=0;
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count(*)
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499
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rollback;
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#
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# Delete throw a view (ALL access)
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#
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start transaction;
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# Acces by pointer, initied = RND
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# +------+--------------------+------------+------+---------------+---------------+---------+--------------------+------+-------------+
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# | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
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# +------+--------------------+------------+------+---------------+---------------+---------+--------------------+------+-------------+
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# | 1 | PRIMARY | tab_delete | ALL | tab_delete_c1 | NULL | NULL | NULL | 589 | Using where |
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# | 2 | DEPENDENT SUBQUERY | b | ref | tab_delete_c1 | tab_delete_c1 | 4 | test.tab_delete.c1 | 295 | Using index |
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# +------+--------------------+------------+------+---------------+---------------+---------+--------------------+------+-------------+
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delete from view_delete where (select count(*) from tab_delete b where b.c1=view_delete.c1) = 500 ;
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affected rows: 500
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select count(*) from view_delete where c1=0;
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count(*)
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0
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rollback;
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#
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# Delete failed due to trigger
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#
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start transaction;
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delete from tab_delete where c1=1 and (select count(*) from tab_delete b where b.c1=tab_delete.c1) > 0 order by c2 asc limit 10;
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ERROR 45000: Unhandled user-defined exception condition
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rollback;
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start transaction;
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delete from tab_delete where (select count(*) from tab_delete b where b.c1=tab_delete.c1) > 0 order by c1 desc limit 100;
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ERROR 45000: Unhandled user-defined exception condition
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select c1,count(*) from tab_delete group by c1;
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c1 count(*)
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0 500
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1 50
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2 20
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3 20
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rollback;
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#
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# Delete throw a view with returning
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#
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start transaction;
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delete from tab_delete where (select count(*) from tab_delete b where b.c1=tab_delete.c1) = 500 order by c2 asc limit 10 returning c1,c2;
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c1 c2
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0 1
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0 2
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0 3
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0 4
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0 5
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0 6
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0 7
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0 8
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0 9
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0 10
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rollback;
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start transaction;
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delete from tab_delete where (select count(*) from tab_delete b where b.c1=tab_delete.c1) = 500 order by c2 desc limit 10 returning c1,c2;
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c1 c2
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0 491
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0 492
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0 493
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0 494
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0 495
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0 496
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0 497
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0 498
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0 499
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0 500
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rollback;
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#
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# Delete from table with more than 150000 rows
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#
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insert into tab_delete select * from tab_delete;
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insert into tab_delete select * from tab_delete;
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insert into tab_delete select * from tab_delete;
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insert into tab_delete select * from tab_delete;
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insert into tab_delete select * from tab_delete;
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insert into tab_delete select * from tab_delete;
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insert into tab_delete select * from tab_delete;
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insert into tab_delete select * from tab_delete;
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select count(*) from tab_delete;
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count(*)
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151040
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with high memory for sort_buffer_size
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SET SESSION sort_buffer_size = 1024000;
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start transaction;
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delete from tab_delete where c1=0 and exists(select 'x' from tab_delete b where b.c1<10);
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affected rows: 128000
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rollback;
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with few memory for sort_buffer_size
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SET SESSION sort_buffer_size = 1024;
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start transaction;
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delete from tab_delete where c1=0 and exists(select 'x' from tab_delete b where b.c1<10);
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affected rows: 128000
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rollback;
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drop procedure if exists gendata;
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drop view if exists view_delete;
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drop table if exists tab_delete;
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