cloudberry/contrib/btree_gist/expected/float8_optimizer.out at 8f7b81e5ac91fb4687f6e4cada3cb6e90005084d · apache/cloudberry · GitHub

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-- float8 check
CREATE TABLE float8tmp (a float8);
\copy float8tmp from 'data/float8.data'
SET enable_seqscan=on;
SELECT count(*) FROM float8tmp WHERE a <  -1890.0;
 count
-------
   237
(1 row)

SELECT count(*) FROM float8tmp WHERE a <= -1890.0;
 count
-------
   238
(1 row)

SELECT count(*) FROM float8tmp WHERE a  = -1890.0;
 count
-------
     1
(1 row)

SELECT count(*) FROM float8tmp WHERE a >= -1890.0;
 count
-------
   307
(1 row)

SELECT count(*) FROM float8tmp WHERE a >  -1890.0;
 count
-------
   306
(1 row)

SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
      a       |      ?column?
--------------+--------------------
        -1890 |                  0
 -2003.634512 | 113.63451200000009
  -1769.73634 | 120.26366000000007
(3 rows)

CREATE INDEX float8idx ON float8tmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM float8tmp WHERE a <  -1890.0::float8;
 count
-------
   237
(1 row)

SELECT count(*) FROM float8tmp WHERE a <= -1890.0::float8;
 count
-------
   238
(1 row)

SELECT count(*) FROM float8tmp WHERE a  = -1890.0::float8;
 count
-------
     1
(1 row)

SELECT count(*) FROM float8tmp WHERE a >= -1890.0::float8;
 count
-------
   307
(1 row)

SELECT count(*) FROM float8tmp WHERE a >  -1890.0::float8;
 count
-------
   306
(1 row)

EXPLAIN (COSTS OFF)
SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
                         QUERY PLAN
-------------------------------------------------------------
 Limit
   ->  Gather Motion 3:1  (slice1; segments: 3)
         Merge Key: ((a <-> '-1890'::double precision))
         ->  Limit
               ->  Index Only Scan using float8idx on float8tmp
                     Order By: (a <-> '-1890'::double precision)
(7 rows)

SELECT a, a <-> '-1890.0' FROM float8tmp ORDER BY a <-> '-1890.0' LIMIT 3;
      a       |      ?column?
--------------+--------------------
        -1890 |                  0
 -2003.634512 | 113.63451200000009
  -1769.73634 | 120.26366000000007
(3 rows)