set enable_seqscan=off;
CREATE TABLE test_int2 (
	i int2
);
INSERT INTO test_int2 VALUES (-2),(-1),(0),(1),(2),(3);
CREATE INDEX idx_int2 ON test_int2 USING gin (i);
SELECT * FROM test_int2 WHERE i<1::int2 ORDER BY i;
 i  
----
 -2
 -1
  0
(3 rows)

SELECT * FROM test_int2 WHERE i<=1::int2 ORDER BY i;
 i  
----
 -2
 -1
  0
  1
(4 rows)

SELECT * FROM test_int2 WHERE i=1::int2 ORDER BY i;
 i 
---
 1
(1 row)

SELECT * FROM test_int2 WHERE i>=1::int2 ORDER BY i;
 i 
---
 1
 2
 3
(3 rows)

SELECT * FROM test_int2 WHERE i>1::int2 ORDER BY i;
 i 
---
 2
 3
(2 rows)

explain (costs off)
SELECT * FROM test_int2 WHERE i<1::int4 ORDER BY i;
                QUERY PLAN                 
-------------------------------------------
 Sort
   Sort Key: i
   ->  Bitmap Heap Scan on test_int2
         Recheck Cond: (i < 1)
         ->  Bitmap Index Scan on idx_int2
               Index Cond: (i < 1)
(6 rows)

SELECT * FROM test_int2 WHERE i<1::int4 ORDER BY i;
 i  
----
 -2
 -1
  0
(3 rows)

SELECT * FROM test_int2 WHERE i<=1::int4 ORDER BY i;
 i  
----
 -2
 -1
  0
  1
(4 rows)

SELECT * FROM test_int2 WHERE i=1::int4 ORDER BY i;
 i 
---
 1
(1 row)

SELECT * FROM test_int2 WHERE i>=1::int4 ORDER BY i;
 i 
---
 1
 2
 3
(3 rows)

SELECT * FROM test_int2 WHERE i>1::int4 ORDER BY i;
 i 
---
 2
 3
(2 rows)

explain (costs off)
SELECT * FROM test_int2 WHERE i<1::int8 ORDER BY i;
                 QUERY PLAN                  
---------------------------------------------
 Sort
   Sort Key: i
   ->  Bitmap Heap Scan on test_int2
         Recheck Cond: (i < '1'::bigint)
         ->  Bitmap Index Scan on idx_int2
               Index Cond: (i < '1'::bigint)
(6 rows)

SELECT * FROM test_int2 WHERE i<1::int8 ORDER BY i;
 i  
----
 -2
 -1
  0
(3 rows)

SELECT * FROM test_int2 WHERE i<=1::int8 ORDER BY i;
 i  
----
 -2
 -1
  0
  1
(4 rows)

SELECT * FROM test_int2 WHERE i=1::int8 ORDER BY i;
 i 
---
 1
(1 row)

SELECT * FROM test_int2 WHERE i>=1::int8 ORDER BY i;
 i 
---
 1
 2
 3
(3 rows)

SELECT * FROM test_int2 WHERE i>1::int8 ORDER BY i;
 i 
---
 2
 3
(2 rows)

-- Check endpoint and out-of-range cases
INSERT INTO test_int2 VALUES ((-32768)::int2),(32767);
SELECT gin_clean_pending_list('idx_int2');
 gin_clean_pending_list 
------------------------
                      1
(1 row)

SELECT * FROM test_int2 WHERE i<(-32769)::int4 ORDER BY i;
 i 
---
(0 rows)

SELECT * FROM test_int2 WHERE i<=(-32769)::int4 ORDER BY i;
 i 
---
(0 rows)

SELECT * FROM test_int2 WHERE i=(-32769)::int4 ORDER BY i;
 i 
---
(0 rows)

SELECT * FROM test_int2 WHERE i>=(-32769)::int4 ORDER BY i;
   i    
--------
 -32768
     -2
     -1
      0
      1
      2
      3
  32767
(8 rows)

SELECT * FROM test_int2 WHERE i>(-32769)::int4 ORDER BY i;
   i    
--------
 -32768
     -2
     -1
      0
      1
      2
      3
  32767
(8 rows)

SELECT * FROM test_int2 WHERE i<32768::int4 ORDER BY i;
   i    
--------
 -32768
     -2
     -1
      0
      1
      2
      3
  32767
(8 rows)

SELECT * FROM test_int2 WHERE i<=32768::int4 ORDER BY i;
   i    
--------
 -32768
     -2
     -1
      0
      1
      2
      3
  32767
(8 rows)

SELECT * FROM test_int2 WHERE i=32768::int4 ORDER BY i;
 i 
---
(0 rows)

SELECT * FROM test_int2 WHERE i>=32768::int4 ORDER BY i;
 i 
---
(0 rows)

SELECT * FROM test_int2 WHERE i>32768::int4 ORDER BY i;
 i 
---
(0 rows)