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|
set enable_seqscan=off;
CREATE TABLE test_float8 (
i float8
);
INSERT INTO test_float8 VALUES (-2),(-1),(0),(1),(2),(3);
CREATE INDEX idx_float8 ON test_float8 USING rum (i);
SELECT * FROM test_float8 WHERE i<1::float8 ORDER BY i;
i
----
-2
-1
0
(3 rows)
SELECT * FROM test_float8 WHERE i<=1::float8 ORDER BY i;
i
----
-2
-1
0
1
(4 rows)
SELECT * FROM test_float8 WHERE i=1::float8 ORDER BY i;
i
---
1
(1 row)
SELECT * FROM test_float8 WHERE i>=1::float8 ORDER BY i;
i
---
1
2
3
(3 rows)
SELECT * FROM test_float8 WHERE i>1::float8 ORDER BY i;
i
---
2
3
(2 rows)
EXPLAIN (costs off)
SELECT *, i <=> 0::float8 FROM test_float8 ORDER BY i <=> 0::float8;
QUERY PLAN
--------------------------------------------
Index Scan using idx_float8 on test_float8
Order By: (i <=> '0'::double precision)
(2 rows)
SELECT *, i <=> 0::float8 FROM test_float8 ORDER BY i <=> 0::float8;
i | ?column?
----+----------
0 | 0
-1 | 1
1 | 1
-2 | 2
2 | 2
3 | 3
(6 rows)
EXPLAIN (costs off)
SELECT *, i <=> 1::float8 FROM test_float8 WHERE i<1::float8 ORDER BY i <=> 1::float8;
QUERY PLAN
--------------------------------------------
Index Scan using idx_float8 on test_float8
Index Cond: (i < '1'::double precision)
Order By: (i <=> '1'::double precision)
(3 rows)
SELECT *, i <=> 1::float8 FROM test_float8 WHERE i<1::float8 ORDER BY i <=> 1::float8;
i | ?column?
----+----------
0 | 1
-1 | 2
-2 | 3
(3 rows)
|
