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75d354a23a
Gain MySQL compatibility by allowing table aliases in a single table statement. This now supports the syntax of: DELETE [delete_opts] FROM tbl_name [[AS] tbl_alias] [PARTITION (partition_name [, partition_name] ...)] .... The delete.test is from MySQL commit 1a72b69778a9791be44525501960b08856833b8d / Change-Id: Iac3a2b5ed993f65b7f91acdfd60013c2344db5c0. Co-Author: Gleb Shchepa <gleb.shchepa@oracle.com> (for delete.test) Reviewed by Igor Babaev (igor@mariadb.com)
407 lines
11 KiB
Text
407 lines
11 KiB
Text
create table t1(c1 integer not null,c2 integer not null, key (c1))
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ENGINE=InnoDB STATS_PERSISTENT=1;
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create view v1 as select * from t1 where c1 in (0,1);
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insert t1 select 0,seq from seq_1_to_500;
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insert t1 select 1,seq from seq_1_to_100;
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insert t1 select 2,seq from seq_1_to_50;
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insert t1 select 3,seq from seq_1_to_20;
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analyze table t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status Engine-independent statistics collected
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test.t1 analyze status OK
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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 t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 limit 1;
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affected rows: 1
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delete from t1 where (select count(*) from t1 b where b.c1=t1.c1) = 500 limit 1;
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affected rows: 0
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select count(*) from v1 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 t1 where (select count(*) from t1 b where b.c1=t1.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 v1 where c1=2;
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count(*)
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0
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delete from t1 where c1=2 and exists(select 'x' from t1 b where b.c2<10);
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affected rows: 50
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delete from t1 where c1=2 and exists(select 'x' from t1 b where b.c2<10);
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affected rows: 0
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select count(*) from v1 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 through a view with limit (range access)
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#
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start transaction;
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explain delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 range c1 c1 4 NULL 600 Using index condition; Using where
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2 DEPENDENT SUBQUERY b ref c1 c1 4 test.t1.c1 167 Using index
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delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
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affected rows: 1
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delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 limit 1;
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affected rows: 0
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select count(*) from v1 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 through a view (ALL access)
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#
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start transaction;
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explain delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 range c1 c1 4 NULL # Using index condition; Using where
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2 DEPENDENT SUBQUERY b ref c1 c1 4 test.t1.c1 # Using index
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delete from v1 where (select count(*) from t1 b where b.c1=v1.c1) = 500 ;
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affected rows: 500
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select count(*) from v1 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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create trigger trg after delete on t1 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 t1 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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start transaction;
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delete from t1 where c1=1 and (select count(*) from t1 b where b.c1=t1.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 t1 where (select count(*) from t1 b where b.c1=t1.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 t1 group by c1;
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c1 count(*)
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0 500
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1 100
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2 50
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3 20
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rollback;
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drop trigger trg;
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#
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# Delete through a view with returning
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#
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start transaction;
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delete from t1 where (select count(*) from t1 b where b.c1=t1.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 t1 where (select count(*) from t1 b where b.c1=t1.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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drop view v1;
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drop table t1;
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#
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# Delete from table with more than 150000 rows
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#
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create table t1(c1 integer not null,c2 integer not null, key (c1));
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insert t1 select 0,seq from seq_1_to_128000;
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insert t1 select 1,seq from seq_1_to_25600;
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select count(*) from t1;
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count(*)
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153600
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# with a lot of memory for sort_buffer_size
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set session sort_buffer_size = 1024000;
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delete from t1 where c1=0 and exists(select 'x' from t1 b where b.c1<10);
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affected rows: 128000
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# with little memory for sort_buffer_size
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insert t1 select 0,seq from seq_1_to_128000;
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set session sort_buffer_size = 1024;
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delete from t1 where c1=0 and exists(select 'x' from t1 b where b.c1<10);
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affected rows: 128000
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drop table t1;
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#
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# MDEV-17954: multi-table DELETE with the same source and target
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#
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create table t1 (c1 int, c2 int, c3 int);
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insert into t1 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
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#
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# Single-table DELETE with the same source and target
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# handled as multi-table DELETE
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#
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explain delete from t1
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where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1 and a.c2 < 3);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where
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1 PRIMARY a ALL NULL NULL NULL NULL 8 Using where; FirstMatch(t1)
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delete from t1
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where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1 and a.c2 < 3);
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select * from t1;
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c1 c2 c3
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1 3 3
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2 3 6
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2 4 7
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2 5 8
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delete from t1;
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insert into t1 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
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prepare stmt from "delete from t1
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where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1 and a.c2 < 3)";
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execute stmt;
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select * from t1;
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c1 c2 c3
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1 3 3
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2 3 6
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2 4 7
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2 5 8
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delete from t1;
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insert into t1 values
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(2,2,5), (2,3,6), (2,4,7), (2,5,8);
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execute stmt;
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select * from t1;
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c1 c2 c3
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2 3 6
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2 4 7
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2 5 8
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deallocate prepare stmt;
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delete from t1;
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insert into t1 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
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#
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# Multi-table DELETE with the same source and target
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#
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create table t2 (c1 int, c2 int, c3 int);
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insert into t2 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,5,8);
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explain delete from t1 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 7
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where
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delete from t1 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1;
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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2 4 7
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delete from t1;
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insert into t1 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
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prepare stmt from "delete from t1 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1";
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execute stmt;
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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2 4 7
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delete from t1;
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insert into t1 values
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(2,2,5), (2,3,6), (2,4,7), (2,5,8);
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execute stmt;
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select * from t1;
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c1 c2 c3
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2 4 7
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deallocate prepare stmt;
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explain delete from t1 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1
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1 SIMPLE t2 ALL NULL NULL NULL NULL 7 Using where
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delete from t1 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1;
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select * from t1;
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c1 c2 c3
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2 4 7
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delete from t1;
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insert into t1 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
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prepare stmt from "delete from t1 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1";
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execute stmt;
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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2 4 7
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delete from t1;
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insert into t1 values
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(2,2,5), (2,3,6), (2,4,7), (2,5,8);
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execute stmt;
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select * from t1;
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c1 c2 c3
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2 4 7
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deallocate prepare stmt;
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delete from t1;
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insert into t1 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
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explain delete from t1,t2 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1 and t2.c1 > 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 7 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where
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delete from t1,t2 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1 and t2.c1 > 1;
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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2 4 7
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select * from t2;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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delete from t1;
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insert into t1 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
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delete from t2;
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insert into t2 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,5,8);
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prepare stmt from "delete from t1,t2 using t1,t2
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where t1.c2 = t2.c2 and t1.c1 > 1 and t2.c1 > 1";
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execute stmt;
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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2 4 7
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select * from t2;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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delete from t1;
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insert into t1 values
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(1,2,2), (1,3,3), (2,2,5), (2,3,6), (2,4,7), (2,5,8);
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delete from t2;
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insert into t2 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5);
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execute stmt;
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select * from t1;
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c1 c2 c3
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1 2 2
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1 3 3
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2 3 6
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2 4 7
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2 5 8
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select * from t2;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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2 1 4
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deallocate prepare stmt;
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drop table t1,t2;
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# End of 11.1
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#
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# MDEV-33988 DELETE (single table) to support table aliases
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#
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create table t1 (c1 int, c2 int, c3 int);
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insert into t1 values
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(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,5,7), (3,5,8);
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create table t2 (id int auto_increment primary key, a int, key(a));
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insert into t2(a) values (3), (5), (-1);
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# 1. The alias in delete coincides with the table name in IN subquery.
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explain extended
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delete from t1 t2 where t2.c1 in (select a from t2);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 8 100.00 Using where
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1 PRIMARY t2 ref a a 5 test.t2.c1 1 100.00 Using index; FirstMatch(t2)
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Warnings:
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Note 1003 delete from `test`.`t1` `t2` using (`test`.`t2`) where `test`.`t2`.`a` = `test`.`t2`.`c1`
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delete from t1 t2 where t2.c1 in (select a from t2);
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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1 3 3
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2 1 4
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2 2 5
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2 3 6
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2 5 7
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# 2. The alias in delete is different from the alias in IN subquery
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explain extended
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delete from t1 t_x where t_x.c2 IN (select a from t2 as t_y);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t_x ALL NULL NULL NULL NULL 7 100.00 Using where
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1 PRIMARY t_y ref a a 5 test.t_x.c2 1 100.00 Using index; FirstMatch(t_x)
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Warnings:
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Note 1003 delete from `test`.`t1` `t_x` using (`test`.`t2` `t_y`) where `test`.`t_y`.`a` = `test`.`t_x`.`c2`
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delete from t1 t_x where t_x.c2 IN (select a from t2 as t_y);
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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2 1 4
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2 2 5
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# 3. The alias in delete is the same as the alias in IN subquery.
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explain extended
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delete from t1 as t_x where t_x.c3 IN (select a from t2 t_x);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t_x ALL NULL NULL NULL NULL 4 100.00 Using where
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1 PRIMARY t_x ref a a 5 test.t_x.c3 1 100.00 Using index; FirstMatch(t_x)
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Warnings:
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Note 1003 delete from `test`.`t1` `t_x` using (`test`.`t2` `t_x`) where `test`.`t_x`.`a` = `test`.`t_x`.`c3`
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delete from t1 as t_x where t_x.c3 IN (select a from t2 t_x);
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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2 1 4
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# 4. The table in delete is the alias in IN subquery
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explain extended
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delete from t1 t2 where t2.c1 IN (select a -1 from t2 as t1);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 3 100.00
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1 PRIMARY t1 index NULL a 5 NULL 3 33.33 Using where; Using index; FirstMatch(t2)
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Warnings:
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Note 1003 delete from `test`.`t1` `t2` using (`test`.`t2` `t1`) where `test`.`t2`.`c1` = `test`.`t1`.`a` - 1
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delete from t1 t2 where t2.c1 IN (select a -1 from t2 as t1);
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select * from t1;
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c1 c2 c3
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1 1 1
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1 2 2
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drop table t1, t2;
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# End of 11.6
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