CREATE FUNCTION
CREATE FUNCTION
CREATE TABLE
INSERT 0 100000
                                            QUERY PLAN                                             
---------------------------------------------------------------------------------------------------
 Seq Scan on t  (cost=0.00..1944.77 rows=3 width=8) (actual time=0.049..37.182 rows=10000 loops=1)
   Filter: ((a = 1) AND (b = 1))
   Rows Removed by Filter: 90000
 Planning Time: 0.380 ms
 Execution Time: 37.751 ms
(5 rows)

 clause | extstats 
--------+----------
(0 rows)

                          QUERY PLAN                           
---------------------------------------------------------------
 HashAggregate  (cost=1944.77..2044.89 rows=10012 width=12)
   Group Key: a, b
   ->  Seq Scan on t  (cost=0.00..1444.18 rows=100118 width=8)
(3 rows)

 clause | extstats 
--------+----------
(0 rows)

CREATE STATISTICS
ANALYZE
                   List of extended statistics
 Schema | Name | Definition  | Ndistinct | Dependencies |   MCV   
--------+------+-------------+-----------+--------------+---------
 public | s    | a, b FROM t | defined   | defined      | defined
(1 row)

                                              QUERY PLAN                                              
------------------------------------------------------------------------------------------------------
 Seq Scan on t  (cost=0.00..1943.00 rows=9947 width=8) (actual time=0.021..26.203 rows=10000 loops=1)
   Filter: ((a = 1) AND (b = 1))
   Rows Removed by Filter: 90000
   Ext Stats: public.s  Clauses: ((a = 1) AND (b = 1))
 Planning Time: 0.169 ms
 Execution Time: 26.958 ms
(6 rows)

            clause             |                 extstats                 
-------------------------------+------------------------------------------
 Filter: ((a = 1) AND (b = 1)) | public.s  Clauses: ((a = 1) AND (b = 1))
(1 row)

                                                  QUERY PLAN                                                   
---------------------------------------------------------------------------------------------------------------
 HashAggregate  (cost=1943.00..1943.10 rows=10 width=12) (actual time=96.912..96.918 rows=10 loops=1)
   Group Key: a, b
   Batches: 1  Memory Usage: 24kB
   ->  Seq Scan on t  (cost=0.00..1443.00 rows=100000 width=8) (actual time=0.026..24.280 rows=100000 loops=1)
         Ext Stats: public.s  Clauses: a, b
 Planning Time: 0.353 ms
 Execution Time: 96.974 ms
(7 rows)

     clause      |        extstats         
-----------------+-------------------------
 Group Key: a, b | public.s  Clauses: a, b
(1 row)

SET
                                                  QUERY PLAN                                                   
---------------------------------------------------------------------------------------------------------------
 HashAggregate  (cost=1943.00..1943.10 rows=10 width=12) (actual time=89.360..89.366 rows=10 loops=1)
   Group Key: a, b
   Batches: 1  Memory Usage: 24kB
   ->  Seq Scan on t  (cost=0.00..1443.00 rows=100000 width=8) (actual time=0.017..19.903 rows=100000 loops=1)
         Ext Stats: public.s  Clauses: a, b
         Ext Stats: public.s  Clauses: a, b
 Planning Time: 0.094 ms
 Execution Time: 89.409 ms
(8 rows)

     clause      |        extstats         
-----------------+-------------------------
 Group Key: a, b | public.s  Clauses: a, b
(1 row)

PREPARE
                                              QUERY PLAN                                              
------------------------------------------------------------------------------------------------------
 Seq Scan on t  (cost=0.00..1943.00 rows=9850 width=8) (actual time=0.024..27.818 rows=10000 loops=1)
   Filter: ((a = 5) AND (b = 5))
   Rows Removed by Filter: 90000
 Planning Time: 0.108 ms
 Execution Time: 28.510 ms
(5 rows)

DROP TABLE
DROP FUNCTION
                 List of extended statistics
 Schema | Name | Definition | Ndistinct | Dependencies | MCV 
--------+------+------------+-----------+--------------+-----
(0 rows)