path: root/mysql-test/t/partition_pruning.test

#
# Partition pruning tests. Currently we only detect which partitions to
# prune, so the test is EXPLAINs.
#
-- source include/have_partition.inc

--disable_warnings
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
--enable_warnings


# Check if we can infer from condition on partition fields that 
# no records will match.
create table t1 ( a int not null) partition by hash(a) partitions 2;
insert into t1 values (1),(2),(3);
explain select * from t1 where a=5 and a=6;
drop table t1;

# Simple HASH partitioning
create table t1 (
  a int(11) not null
) partition by hash (a) partitions 2;
insert into t1 values (1),(2),(3);

explain partitions select * from t1 where a=1;
explain partitions select * from t1 where a=2;
explain partitions select * from t1 where a=1 or a=2;

# Partitioning over several fields
create table t2 (
  a int not null,
  b int not null
) partition by key(a,b) partitions 2;
insert into t2 values (1,1),(2,2),(3,3);

explain partitions select * from t2 where a=1;
explain partitions select * from t2 where b=1;

explain partitions select * from t2 where a=1 and b=1;

# RANGE(expr) partitioning 
create table t3 (
  a int
)
partition by range (a*1) ( 
  partition p0 values less than (10),
  partition p1 values less than (20)
);
insert into t3 values (5),(15);

explain partitions select * from t3 where a=11;
explain partitions select * from t3 where a=10;
explain partitions select * from t3 where a=20;

explain partitions select * from t3 where a=30;

# LIST(expr) partitioning
create table t4 (a int not null, b int not null) partition by LIST (a+b) (
  partition p0 values in (12),
  partition p1 values in (14)
);
insert into t4 values (10,2), (10,4);

# empty OR one
explain partitions select * from t4 where (a=10 and b=1) or (a=10 and b=2);

# empty OR one OR empty
explain partitions select * from t4 
  where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);

# one OR empty OR one
explain partitions select * from t4 where (a=10 and b=2) or (a=10 and b=3)
  or (a=10 and b = 4);

# empty OR full
explain partitions select * from t4 where (a=10 and b=1) or a=11;

# one OR full
explain partitions select * from t4 where (a=10 and b=2) or a=11;

drop table t1, t2, t3, t4;

# LIST(expr)/HASH subpartitioning.
create table t5 (a int not null, b int not null, 
                 c int not null, d int not null) 
partition by LIST(a+b) subpartition by HASH (c+d) subpartitions 2
(
  partition p0 values in (12),
  partition p1 values in (14)
);
 
insert into t5 values (10,2,0,0), (10,4,0,0), (10,2,0,1), (10,4,0,1);
explain partitions select * from t5;

# empty OR one OR empty
explain partitions select * from t5
  where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);

# one OR empty OR one
explain partitions select * from t5 where (a=10 and b=2) or (a=10 and b=3)
  or (a=10 and b = 4);

# conditions on subpartitions only
explain partitions select * from t5 where (c=1 and d=1);
explain partitions select * from t5 where (c=2 and d=1);

# mixed partition/subpartitions.
explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or 
(c=2 and d=1);

# same as above
explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or 
(b=2 and c=2 and d=1);

# LIST(field) partitioning, interval analysis.
create table t6 (a int not null) partition by LIST(a) (
  partition p1 values in (1),
  partition p3 values in (3),
  partition p5 values in (5),
  partition p7 values in (7),
  partition p9 values in (9)
);
insert into t6 values (1),(3),(5);

explain partitions select * from t6 where a <  1;
explain partitions select * from t6 where a <= 1;
explain partitions select * from t6 where a >  9;
explain partitions select * from t6 where a >= 9;

explain partitions select * from t6 where a > 0 and a < 5;
explain partitions select * from t6 where a > 5 and a < 12;
explain partitions select * from t6 where a > 3 and a < 8 ;

explain partitions select * from t6 where a >= 0 and a <= 5;
explain partitions select * from t6 where a >= 5 and a <= 12;
explain partitions select * from t6 where a >= 3 and a <= 8;

explain partitions select * from t6 where a > 3 and a < 5;

# RANGE(field) partitioning, interval analysis.
create table t7 (a int not null) partition by RANGE(a) (
  partition p10 values less than (10),
  partition p30 values less than (30),
  partition p50 values less than (50),
  partition p70 values less than (70),
  partition p90 values less than (90)
);
insert into t7 values (10),(30),(50);

# leftmost intervals
explain partitions select * from t7 where a < 5;
explain partitions select * from t7 where a < 10;
explain partitions select * from t7 where a <= 10;
explain partitions select * from t7 where a = 10;

#rightmost intervals
explain partitions select * from t7 where a < 90;
explain partitions select * from t7 where a = 90;
explain partitions select * from t7 where a > 90;
explain partitions select * from t7 where a >= 90;

# misc intervals
explain partitions select * from t7 where a > 11 and a < 29;

# LIST(monontonic_func) partitioning
create table t8 (a date not null) partition by RANGE(YEAR(a)) (
  partition p0 values less than (1980),
  partition p1 values less than (1990),
  partition p2 values less than (2000)
);
insert into t8 values ('1985-05-05'),('1995-05-05');

explain partitions select * from t8 where a < '1980-02-02';

# LIST(strict_monotonic_func) partitioning
create table t9 (a date not null) partition by RANGE(TO_DAYS(a)) (
  partition p0 values less than (732299), -- 2004-12-19
  partition p1 values less than (732468), -- 2005-06-06
  partition p2 values less than (732664)  -- 2005-12-19
);
insert into t9 values ('2005-05-05'), ('2005-04-04');

explain partitions select * from t9 where a <  '2004-12-19';
explain partitions select * from t9 where a <= '2004-12-19';

drop table t5,t6,t7,t8,t9;

# Test the case where we can't create partitioning 'index'
create table t1 (a enum('a','b','c','d') default 'a') 
  partition by hash (ascii(a)) partitions 2;
insert into t1 values ('a'),('b'),('c');
explain partitions select * from t1 where a='b';
drop table t1;

#
# Test cases for bugs found in code review:
#
create table t1 (
  a1 int not null
)
partition by range (a1) (
  partition p0 values less than (3),
  partition p1 values less than (6),
  partition p2 values less than (9)
);
insert into t1 values (1),(2),(3);
explain partitions select * from t1 where a1 > 3;
explain partitions select * from t1 where a1 >= 3;

explain partitions select * from t1 where a1 < 3 and a1 > 3;
drop table t1;

#
create table t3 (a int, b int) 
  partition by list(a) subpartition by hash(b) subpartitions 4 (
    partition p0 values in (1),
    partition p1 values in (2),
    partition p2 values in (3),
    partition p3 values in (4)
  );
insert into t3 values (1,1),(2,2),(3,3);

explain partitions select * from t3 where a=2 or b=1;
explain partitions select * from t3 where a=4 or b=2;
explain partitions select * from t3 where (a=2 or b=1) and (a=4 or b=2) ;
drop table t3;

# Test for NULLs
create table t1 (a int) partition by hash(a) partitions 2;
insert into t1 values (1),(2);
explain partitions select * from t1 where a is null;

# this uses both partitions
explain partitions select * from t1 where a is not null;
drop table t1;

# Join tests
create table t1 (a int not null, b int not null, key(a), key(b))
  partition by hash(a) partitions 4;
insert into t1 values (1,1),(2,2),(3,3),(4,4);

explain partitions 
select * from t1 X, t1 Y 
where X.b = Y.b and (X.a=1 or X.a=2) and (Y.a=2 or Y.a=3);

explain partitions
select * from t1 X, t1 Y where X.a = Y.a and (X.a=1 or X.a=2);

drop table t1;

# Tests for "short ranges"
create table t1 (a int) partition by hash(a) partitions 20;
insert into t1 values (1),(2),(3);
explain partitions select * from t1 where a >  1 and a < 3;
explain partitions select * from t1 where a >= 1 and a < 3;
explain partitions select * from t1 where a >  1 and a <= 3;
explain partitions select * from t1 where a >= 1 and a <= 3;
drop table t1;

create table t1 (a int, b int) 
 partition by list(a) subpartition by hash(b) subpartitions 20 
(
  partition p0 values in (0),
  partition p1 values in (1),
  partition p2 values in (2),
  partition p3 values in (3)
);
insert into t1 values (1,1),(2,2),(3,3);

explain partitions select * from t1 where b >  1 and b < 3;
explain partitions select * from t1 where b >  1 and b < 3 and (a =1 or a =2);
drop table t1;

# Test partition pruning for single-table UPDATE/DELETE.
# TODO: Currently we test only "all partitions pruned away" case. Add more
# tests when the patch that makes use of partition pruning results at
# execution phase is pushed.

create table t1 (a int) partition by list(a) (
  partition p0 values in (1,2),
  partition p1 values in (3,4)
);
insert into t1 values (1),(1),(2),(2),(3),(4),(3),(4);

# This won't do any table access
flush status;
update t1 set a=100 where a=5;
show status like 'Handler_read_rnd_next';

# ... as compared to this, which will scan both partitions
flush status;
update t1 set a=100 where a+1=5+1;
show status like 'Handler_read_rnd_next';

# Same as above for DELETE:
flush status;
delete from t1 where a=5;
show status like 'Handler_read_rnd_next';

flush status;
delete from t1 where a+1=5+1;
show status like 'Handler_read_rnd_next';

# Same as above multi-table UPDATE/DELETE
create table t2 like t1;
insert into t2 select * from t2;

flush status;
update t1,t2 set t1.a=1000, t2.a=1000 where t1.a=5 and t2.a=5;
show status like 'Handler_read_rnd_next';
# ^ This shows 3 accesses, these are caused by const table reads. 
# They should vanish when partition pruning results are used.

flush status;
delete t1,t2 from t1, t2 where t1.a=5 and t2.a=5;
show status like 'Handler_read_rnd_next';
drop table t1,t2;

#
# WL#2986 Tests (Checking if partition pruning results are used at query
#   execution phase)
#
CREATE TABLE `t1` (
  `a` int(11) default NULL
);
INSERT INTO t1 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

CREATE TABLE `t2` (
  `a` int(11) default NULL,
  KEY `a` (`a`)
) ;

insert into t2 select A.a + 10*(B.a + 10* C.a) from t1 A, t1 B, t1 C ;
insert into t1 select a from t2;

drop table t2;
CREATE TABLE `t2` (
  `a` int(11) default NULL,
  `b` int(11) default NULL
) 
PARTITION BY RANGE (a) (
PARTITION p0 VALUES LESS THAN (200),
PARTITION p1 VALUES LESS THAN (400),
PARTITION p2 VALUES LESS THAN (600),
PARTITION p3 VALUES LESS THAN (800),
PARTITION p4 VALUES LESS THAN (1001));

insert into t2 select a,1 from t1 where a < 200;
insert into t2 select a,2 from t1 where a >= 200 and a < 400;
insert into t2 select a,3 from t1 where a >= 400 and a < 600;
insert into t2 select a,4 from t1 where a >= 600 and a < 800;
insert into t2 select a,5 from t1 where a >= 800 and a < 1001;

explain partitions select * from t2;
explain partitions select * from t2 where a < 801 and a > 200;
explain partitions select * from t2 where a < 801 and a > 800;
explain partitions select * from t2 where a > 600;
explain partitions select * from t2 where a > 600 and b = 1;
explain partitions select * from t2 where a > 600 and b = 4;
explain partitions select * from t2 where a > 600 and b = 5;
explain partitions select * from t2 where b = 5;

flush status;
update t2 set b = 100 where b = 6;
show status like 'Handler_read_rnd_next';
flush status;
update t2 set a = 1002 where a = 1001;
show status like 'Handler_read_rnd_next';
flush status;
update t2 set b = 6 where a = 600;
show status like 'Handler_read_rnd_next';
flush status;
update t2 set b = 6 where a > 600 and a < 800;
show status like 'Handler_read_rnd_next';
flush status;
delete from t2 where a > 600;
show status like 'Handler_read_rnd_next';

drop table t2;
CREATE TABLE `t2` (
  `a` int(11) default NULL,
  `b` int(11) default NULL,
  index (b)
) 
PARTITION BY RANGE (a) (
PARTITION p0 VALUES LESS THAN (200),
PARTITION p1 VALUES LESS THAN (400),
PARTITION p2 VALUES LESS THAN (600),
PARTITION p3 VALUES LESS THAN (800),
PARTITION p4 VALUES LESS THAN (1001));

insert into t2 select a,1 from t1 where a < 100;
insert into t2 select a,2 from t1 where a >= 200 and a < 300;
insert into t2 select a,3 from t1 where a >= 300 and a < 400;
insert into t2 select a,4 from t1 where a >= 400 and a < 500;
insert into t2 select a,5 from t1 where a >= 500 and a < 600;
insert into t2 select a,6 from t1 where a >= 600 and a < 700;
insert into t2 select a,7 from t1 where a >= 700 and a < 800;
insert into t2 select a,8 from t1 where a >= 800 and a < 900;
insert into t2 select a,9 from t1 where a >= 900 and a < 1001;

explain partitions select * from t2;
# not using indexes
explain partitions select * from t2 where a = 101;
explain partitions select * from t2 where a = 550;
explain partitions select * from t2 where a = 833;
explain partitions select * from t2 where (a = 100 OR a = 900);
explain partitions select * from t2 where (a > 100 AND a < 600);
explain partitions select * from t2 where b = 4;
explain partitions select * from t2 where b = 6;
explain partitions select * from t2 where b in (1,3,5);
explain partitions select * from t2 where b in (2,4,6);
explain partitions select * from t2 where b in (7,8,9);
explain partitions select * from t2 where b > 5;
explain partitions select * from t2 where b > 5 and b < 8;
explain partitions select * from t2 where b > 5 and b < 7;
explain partitions select * from t2 where b > 0 and b < 5;

flush status;
update t2 set a = 111 where b = 10;
show status like 'Handler_read_rnd_next';
show status like 'Handler_read_key';
flush status;
update t2 set a = 111 where b in (5,6);
show status like 'Handler_read_rnd_next';
show status like 'Handler_read_key';
flush status;
update t2 set a = 222 where b = 7;
show status like 'Handler_read_rnd_next';
show status like 'Handler_read_key';
flush status;
delete from t2 where b = 7;
show status like 'Handler_read_rnd_next';
show status like 'Handler_read_key';
flush status;
delete from t2 where b > 5;
show status like 'Handler_read_rnd_next';
show status like 'Handler_read_key';
show status like 'Handler_read_prev';
show status like 'Handler_read_next';
flush status;
delete from t2 where b < 5 or b > 3;
show status like 'Handler_read_rnd_next';
show status like 'Handler_read_key';
show status like 'Handler_read_prev';
show status like 'Handler_read_next';

drop table t1, t2;

# BUG#18025 
#  part1: mediumint columns
create table t1 ( f_int1 mediumint, f_int2 integer) 
partition by list(mod(f_int1,4)) (
  partition p_3 values in (-3),
  partition p_2 values in (-2),
  partition p_1 values in (-1),
  partition p0 values in (0),
  partition p1 values in (1),
  partition p2 values in (2),
  partition p3 values in (3)
);

insert into t1 values (9, 9), (8, 8), (7, 7), (6, 6), (5, 5), 
                      (4, 4), (3, 3), (2, 2), (1, 1);
select * from t1 where f_int1 between 5 and 15 order by f_int1;

drop table t1;

#  part2: bug in pruning code
create table t1 (a char(10)) partition by list(length(a)) (
  partition p1 values in (1),
  partition p2 values in (2),
  partition p3 values in (3),
  partition p4 values in (4),
  partition p5 values in (5)
);
insert into t1 values ('a'),('bb'),('ccc'),('dddd'),('eeEee');
select * from t1 where a>='a' and a <= 'dddd';
explain partitions select * from t1 where a>='a' and a <= 'dddd';
drop table t1;

# BUG#18659: Assertion failure when subpartitioning is used and partition is
# "IS NULL"
create table t1 (f_int1 integer) partition by list(abs(mod(f_int1,2)))
  subpartition by hash(f_int1) subpartitions 2
(
  partition part1 values in (0),
  partition part2 values in (1),
  partition part4 values in (null)
);
insert into t1 set f_int1 = null;

select * from t1 where f_int1 is null;
explain partitions select * from t1 where f_int1 is null;
drop table t1;

#
# BUG#18558
#
create table t1 (a int not null, b int not null)
partition by list(a) 
  subpartition by hash(b) subpartitions 4 
(
  partition p0 values in (1),
  partition p1 values in (2),
  partition p2 values in (3)
);
insert into t1 values (1,1),(1,2),(1,3),(1,4),
  (2,1),(2,2),(2,3),(2,4);
explain partitions select * from t1 where a=1 AND (b=1 OR b=2);
drop table t1;

create table t1 (a int, b int not null)
partition by list(a) 
  subpartition by hash(b) subpartitions 2
(
  partition p0 values in (1),
  partition p1 values in (2),
  partition p2 values in (3),
  partition pn values in (NULL)
);
insert into t1 values (1,1),(1,2),(1,3),(1,4),
  (2,1),(2,2),(2,3),(2,4), (NULL,1);

explain partitions select * from t1 where a IS NULL AND (b=1 OR b=2);

explain partitions select * from t1 where (a IS NULL or a < 1) AND (b=1 OR b=2);
explain partitions select * from t1 where (a IS NULL or a < 2) AND (b=1 OR b=2);
explain partitions select * from t1 where (a IS NULL or a <= 1) AND (b=1 OR b=2);

drop table t1;

create table t1 ( a int)  partition by list (MOD(a, 10))
( partition p0  values in (0), partition p1 values in (1),
   partition p2 values in (2), partition p3 values in (3),
   partition p4 values in (4), partition p5 values in (5),
   partition p6 values in (6), partition pn values in (NULL)
);
insert into t1 values (NULL), (0),(1),(2),(3),(4),(5),(6);
explain partitions select * from t1 where a is null or a < 2;
drop table t1;

# Testcase from BUG#18751
create table t1 (s1 int) partition by list (s1) 
  (partition p1 values in (0), 
   partition p2 values in (1), 
   partition p3 values in (null));
 
insert into t1 values (0),(1),(null);
 
select count(*) from t1 where s1 < 0 or s1 is null;
explain partitions select count(*) from t1 where s1 < 0 or s1 is null;
drop table t1;

# No tests for NULLs in RANGE(monotonic_expr()) - they depend on BUG#15447
# being fixed.

#
# BUG#17946 Like searches fail with partitioning
#
create table t1 (a char(32) primary key)
partition by key()
partitions 100;
insert into t1 values ('na');
select * from t1;
select * from t1 where a like 'n%';
drop table t1;


# BUG#19055 Crashes for varchar_col=NUMBER or varchar_col IS NULL
create table t1 (s1 varchar(15)) partition by key (s1);
select * from t1 where s1 = 0 or s1 is null;
insert into t1 values ('aa'),('bb'),('0');
explain partitions select * from t1 where s1 = 0 or s1 is null;
drop table t1;

#
# BUG#19684: EXPLAIN PARTITIONS produces garbage in 'partitions' column when
# the length of string to be displayed exceeds some limit.
create table t2 (a int, b int)
  partition by LIST(a)
  subpartition by HASH(b) subpartitions 40
( partition p_0_long_partition_name values in(1),
  partition p_1_long_partition_name values in(2));

insert into t2 values (1,1),(2,2);

--vertical_results
explain partitions select * from t2;
--horizontal_results
drop table t2;