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path: root/src/test/regress/expected/partition_prune_hash_1.out
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--
-- Test Partition pruning for HASH partitioning
-- We keep this as a seperate test as hash functions return
-- values will vary based on CPU architecture.
--
create table hp (a int, b text) partition by hash (a, b);
create table hp0 partition of hp for values with (modulus 4, remainder 0);
create table hp3 partition of hp for values with (modulus 4, remainder 3);
create table hp1 partition of hp for values with (modulus 4, remainder 1);
create table hp2 partition of hp for values with (modulus 4, remainder 2);
insert into hp values (null, null);
insert into hp values (1, null);
insert into hp values (1, 'xxx');
insert into hp values (null, 'xxx');
insert into hp values (10, 'xxx');
insert into hp values (10, 'yyy');
select tableoid::regclass, * from hp order by 1;
 tableoid | a  |  b  
----------+----+-----
 hp0      |    | 
 hp0      |  1 | 
 hp0      | 10 | xxx
 hp3      |    | xxx
 hp3      | 10 | yyy
 hp2      |  1 | xxx
(6 rows)

-- partial keys won't prune, nor would non-equality conditions
explain (costs off) select * from hp where a = 1;
       QUERY PLAN        
-------------------------
 Append
   ->  Seq Scan on hp0
         Filter: (a = 1)
   ->  Seq Scan on hp1
         Filter: (a = 1)
   ->  Seq Scan on hp2
         Filter: (a = 1)
   ->  Seq Scan on hp3
         Filter: (a = 1)
(9 rows)

explain (costs off) select * from hp where b = 'xxx';
            QUERY PLAN             
-----------------------------------
 Append
   ->  Seq Scan on hp0
         Filter: (b = 'xxx'::text)
   ->  Seq Scan on hp1
         Filter: (b = 'xxx'::text)
   ->  Seq Scan on hp2
         Filter: (b = 'xxx'::text)
   ->  Seq Scan on hp3
         Filter: (b = 'xxx'::text)
(9 rows)

explain (costs off) select * from hp where a is null;
         QUERY PLAN          
-----------------------------
 Append
   ->  Seq Scan on hp0
         Filter: (a IS NULL)
   ->  Seq Scan on hp1
         Filter: (a IS NULL)
   ->  Seq Scan on hp2
         Filter: (a IS NULL)
   ->  Seq Scan on hp3
         Filter: (a IS NULL)
(9 rows)

explain (costs off) select * from hp where b is null;
         QUERY PLAN          
-----------------------------
 Append
   ->  Seq Scan on hp0
         Filter: (b IS NULL)
   ->  Seq Scan on hp1
         Filter: (b IS NULL)
   ->  Seq Scan on hp2
         Filter: (b IS NULL)
   ->  Seq Scan on hp3
         Filter: (b IS NULL)
(9 rows)

explain (costs off) select * from hp where a < 1 and b = 'xxx';
                   QUERY PLAN                    
-------------------------------------------------
 Append
   ->  Seq Scan on hp0
         Filter: ((a < 1) AND (b = 'xxx'::text))
   ->  Seq Scan on hp1
         Filter: ((a < 1) AND (b = 'xxx'::text))
   ->  Seq Scan on hp2
         Filter: ((a < 1) AND (b = 'xxx'::text))
   ->  Seq Scan on hp3
         Filter: ((a < 1) AND (b = 'xxx'::text))
(9 rows)

explain (costs off) select * from hp where a <> 1 and b = 'yyy';
                    QUERY PLAN                    
--------------------------------------------------
 Append
   ->  Seq Scan on hp0
         Filter: ((a <> 1) AND (b = 'yyy'::text))
   ->  Seq Scan on hp1
         Filter: ((a <> 1) AND (b = 'yyy'::text))
   ->  Seq Scan on hp2
         Filter: ((a <> 1) AND (b = 'yyy'::text))
   ->  Seq Scan on hp3
         Filter: ((a <> 1) AND (b = 'yyy'::text))
(9 rows)

-- pruning should work if non-null values are provided for all the keys
explain (costs off) select * from hp where a is null and b is null;
                  QUERY PLAN                   
-----------------------------------------------
 Append
   ->  Seq Scan on hp0
         Filter: ((a IS NULL) AND (b IS NULL))
(3 rows)

explain (costs off) select * from hp where a = 1 and b is null;
                QUERY PLAN                 
-------------------------------------------
 Append
   ->  Seq Scan on hp0
         Filter: ((b IS NULL) AND (a = 1))
(3 rows)

explain (costs off) select * from hp where a = 1 and b = 'xxx';
                   QUERY PLAN                    
-------------------------------------------------
 Append
   ->  Seq Scan on hp2
         Filter: ((a = 1) AND (b = 'xxx'::text))
(3 rows)

explain (costs off) select * from hp where a is null and b = 'xxx';
                     QUERY PLAN                      
-----------------------------------------------------
 Append
   ->  Seq Scan on hp3
         Filter: ((a IS NULL) AND (b = 'xxx'::text))
(3 rows)

explain (costs off) select * from hp where a = 10 and b = 'xxx';
                    QUERY PLAN                    
--------------------------------------------------
 Append
   ->  Seq Scan on hp0
         Filter: ((a = 10) AND (b = 'xxx'::text))
(3 rows)

explain (costs off) select * from hp where a = 10 and b = 'yyy';
                    QUERY PLAN                    
--------------------------------------------------
 Append
   ->  Seq Scan on hp3
         Filter: ((a = 10) AND (b = 'yyy'::text))
(3 rows)

explain (costs off) select * from hp where (a = 10 and b = 'yyy') or (a = 10 and b = 'xxx') or (a is null and b is null);
                                                       QUERY PLAN                                                        
-------------------------------------------------------------------------------------------------------------------------
 Append
   ->  Seq Scan on hp0
         Filter: (((a = 10) AND (b = 'yyy'::text)) OR ((a = 10) AND (b = 'xxx'::text)) OR ((a IS NULL) AND (b IS NULL)))
   ->  Seq Scan on hp3
         Filter: (((a = 10) AND (b = 'yyy'::text)) OR ((a = 10) AND (b = 'xxx'::text)) OR ((a IS NULL) AND (b IS NULL)))
(5 rows)

-- hash partitiong pruning doesn't occur with <> operator clauses
explain (costs off) select * from hp where a <> 1 and b <> 'xxx';
                    QUERY PLAN                     
---------------------------------------------------
 Append
   ->  Seq Scan on hp0
         Filter: ((a <> 1) AND (b <> 'xxx'::text))
   ->  Seq Scan on hp1
         Filter: ((a <> 1) AND (b <> 'xxx'::text))
   ->  Seq Scan on hp2
         Filter: ((a <> 1) AND (b <> 'xxx'::text))
   ->  Seq Scan on hp3
         Filter: ((a <> 1) AND (b <> 'xxx'::text))
(9 rows)

drop table hp;