mariadb/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) ;

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

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