src/test/regress/sql/tuplesort.sql

-- TODO: incremental sort is turned off by default, because it may have
-- wrong result for some core case. Turn it on to run the existing tests
-- and minimize the difference from upstream.
set enable_incremental_sort=on;

-- only use parallelism when explicitly intending to do so
SET max_parallel_maintenance_workers = 0;
SET max_parallel_workers = 0;

-- A table with contents that, when sorted, triggers abbreviated
-- key aborts. One easy way to achieve that is to use uuids that all
-- have the same prefix, as abbreviated keys for uuids just use the
-- first sizeof(Datum) bytes.
CREATE TEMP TABLE abbrev_abort_uuids (
    id serial not null,
    abort_increasing uuid,
    abort_decreasing uuid,
    noabort_increasing uuid,
    noabort_decreasing uuid);

INSERT INTO abbrev_abort_uuids (abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing)
    SELECT
        ('00000000-0000-0000-0000-'||to_char(g.i, '000000000000FM'))::uuid abort_increasing,
        ('00000000-0000-0000-0000-'||to_char(20000 - g.i, '000000000000FM'))::uuid abort_decreasing,
        (to_char(g.i % 10009, '00000000FM')||'-0000-0000-0000-'||to_char(g.i, '000000000000FM'))::uuid noabort_increasing,
        (to_char(((20000 - g.i) % 10009), '00000000FM')||'-0000-0000-0000-'||to_char(20000 - g.i, '000000000000FM'))::uuid noabort_decreasing
    FROM generate_series(0, 20000, 1) g(i);

-- and a few NULLs
INSERT INTO abbrev_abort_uuids(id) VALUES(0);
INSERT INTO abbrev_abort_uuids DEFAULT VALUES;
INSERT INTO abbrev_abort_uuids DEFAULT VALUES;

-- add just a few duplicates
INSERT INTO abbrev_abort_uuids (abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing)
    SELECT abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
    FROM abbrev_abort_uuids
    WHERE (id < 10 OR id > 19990) AND id % 3 = 0 AND abort_increasing is not null AND gp_segment_id = 0;

----
-- Check sort node uses of tuplesort wrt. abbreviated keys
----

-- plain sort triggering abbreviated abort
SELECT abort_increasing, abort_decreasing FROM abbrev_abort_uuids ORDER BY abort_increasing OFFSET 20000 - 4;
SELECT abort_increasing, abort_decreasing FROM abbrev_abort_uuids ORDER BY abort_decreasing NULLS FIRST OFFSET 20000 - 4;

-- plain sort not triggering abbreviated abort
SELECT noabort_increasing, noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_increasing OFFSET 20000 - 4;
SELECT noabort_increasing, noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_decreasing NULLS FIRST OFFSET 20000 - 4;

-- bounded sort (disables abbreviated keys)
SELECT abort_increasing, noabort_increasing FROM abbrev_abort_uuids ORDER BY abort_increasing LIMIT 5;
SELECT abort_increasing, noabort_increasing FROM abbrev_abort_uuids ORDER BY noabort_increasing NULLS FIRST LIMIT 5;


----
-- Check index creation uses of tuplesort wrt. abbreviated keys
----

-- index creation using abbreviated keys successfully
CREATE INDEX abbrev_abort_uuids__noabort_increasing_idx ON abbrev_abort_uuids (noabort_increasing);
CREATE INDEX abbrev_abort_uuids__noabort_decreasing_idx ON abbrev_abort_uuids (noabort_decreasing);

-- verify
EXPLAIN (COSTS OFF)
SELECT id, noabort_increasing, noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_increasing, id LIMIT 5;
SELECT id, noabort_increasing, noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_increasing, id LIMIT 5;
EXPLAIN (COSTS OFF)
SELECT id, noabort_increasing, noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_decreasing, id LIMIT 5;
SELECT id, noabort_increasing, noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_decreasing, id LIMIT 5;

-- index creation using abbreviated keys, hitting abort
CREATE INDEX abbrev_abort_uuids__abort_increasing_idx ON abbrev_abort_uuids (abort_increasing);
CREATE INDEX abbrev_abort_uuids__abort_decreasing_idx ON abbrev_abort_uuids (abort_decreasing);

-- verify
EXPLAIN (COSTS OFF)
SELECT id, abort_increasing, abort_decreasing FROM abbrev_abort_uuids ORDER BY abort_increasing, id LIMIT 5;
SELECT id, abort_increasing, abort_decreasing FROM abbrev_abort_uuids ORDER BY abort_increasing, id LIMIT 5;
EXPLAIN (COSTS OFF)
SELECT id, abort_increasing, abort_decreasing FROM abbrev_abort_uuids ORDER BY abort_decreasing, id LIMIT 5;
SELECT id, abort_increasing, abort_decreasing FROM abbrev_abort_uuids ORDER BY abort_decreasing, id LIMIT 5;


----
-- Check CLUSTER uses of tuplesort wrt. abbreviated keys
----

-- when aborting, increasing order
BEGIN;
SET LOCAL enable_indexscan = false;
CLUSTER abbrev_abort_uuids USING abbrev_abort_uuids__abort_increasing_idx;

-- head
SELECT id, abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
FROM abbrev_abort_uuids
ORDER BY ctid LIMIT 5;

-- tail
SELECT id, abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
FROM abbrev_abort_uuids
ORDER BY ctid DESC LIMIT 5;
ROLLBACK;

-- when aborting, decreasing order
BEGIN;
SET LOCAL enable_indexscan = false;
CLUSTER abbrev_abort_uuids USING abbrev_abort_uuids__abort_decreasing_idx;

-- head
SELECT id, abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
FROM abbrev_abort_uuids
ORDER BY ctid LIMIT 5;

-- tail
SELECT id, abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
FROM abbrev_abort_uuids
ORDER BY ctid DESC LIMIT 5;
ROLLBACK;

-- when not aborting, increasing order
BEGIN;
SET LOCAL enable_indexscan = false;
CLUSTER abbrev_abort_uuids USING abbrev_abort_uuids__noabort_increasing_idx;

-- head
SELECT id, abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
FROM abbrev_abort_uuids
ORDER BY ctid LIMIT 5;

-- tail
SELECT id, abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
FROM abbrev_abort_uuids
ORDER BY ctid DESC LIMIT 5;
ROLLBACK;

-- when no aborting, decreasing order
BEGIN;
SET LOCAL enable_indexscan = false;
CLUSTER abbrev_abort_uuids USING abbrev_abort_uuids__noabort_decreasing_idx;

-- head
SELECT id, abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
FROM abbrev_abort_uuids
ORDER BY ctid LIMIT 5;

-- tail
SELECT id, abort_increasing, abort_decreasing, noabort_increasing, noabort_decreasing
FROM abbrev_abort_uuids
ORDER BY ctid DESC LIMIT 5;
ROLLBACK;

----
-- test forward and backward scans for in-memory and disk based tuplesort
----

-- in-memory
BEGIN;
SET LOCAL enable_indexscan = false;
-- unfortunately can't show analyze output confirming sort method,
-- the memory used output wouldn't be stable
EXPLAIN (COSTS OFF) DECLARE c SCROLL CURSOR FOR SELECT noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_decreasing;
DECLARE c SCROLL CURSOR FOR SELECT noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_decreasing;

-- first and second
FETCH NEXT FROM c;
FETCH NEXT FROM c;

--start_ignore
--GDPB doesn't support backward fetch.
/*
 * scroll beyond beginning
 * FETCH BACKWARD FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH NEXT FROM c;
 * 
 * -- scroll beyond end end
 * FETCH LAST FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH NEXT FROM c;
 * FETCH NEXT FROM c;
 * FETCH NEXT FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH NEXT FROM c;
 */
--end_ignore

COMMIT;

-- disk based
BEGIN;
SET LOCAL enable_indexscan = false;
SET LOCAL work_mem = '100kB';
-- unfortunately can't show analyze output confirming sort method,
-- the memory used output wouldn't be stable
EXPLAIN (COSTS OFF) DECLARE c SCROLL CURSOR FOR SELECT noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_decreasing;
DECLARE c SCROLL CURSOR FOR SELECT noabort_decreasing FROM abbrev_abort_uuids ORDER BY noabort_decreasing;

-- first and second
FETCH NEXT FROM c;
FETCH NEXT FROM c;
--start_ignore
-- scroll beyond beginning
/*
 * FETCH BACKWARD FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH NEXT FROM c;
 * 
 * -- scroll beyond end end
 * FETCH LAST FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH NEXT FROM c;
 * FETCH NEXT FROM c;
 * FETCH NEXT FROM c;
 * FETCH BACKWARD FROM c;
 * FETCH NEXT FROM c;
 */
--end_ignore

COMMIT;


----
-- test tuplesort using both in-memory and disk sort
---

-- memory based
SELECT
    -- fixed-width by-value datum
    (array_agg(id ORDER BY id DESC NULLS FIRST))[0:5],
    -- fixed-width by-ref datum
    (array_agg(abort_increasing ORDER BY abort_increasing DESC NULLS LAST))[0:5],
    -- variable-width datum
    (array_agg(id::text ORDER BY id::text DESC NULLS LAST))[0:5],
    -- fixed width by-value datum tuplesort
    percentile_disc(0.99) WITHIN GROUP (ORDER BY id),
    -- ensure state is shared
    percentile_disc(0.01) WITHIN GROUP (ORDER BY id),
    -- fixed width by-ref datum tuplesort
    percentile_disc(0.8) WITHIN GROUP (ORDER BY abort_increasing),
    -- variable width by-ref datum tuplesort
    percentile_disc(0.2) WITHIN GROUP (ORDER BY id::text),
    -- multi-column tuplesort
    rank('00000000-0000-0000-0000-000000000000', '2', '2') WITHIN GROUP (ORDER BY noabort_increasing, id, id::text)
FROM (
    SELECT * FROM abbrev_abort_uuids
    UNION ALL
    SELECT NULL, NULL, NULL, NULL, NULL) s;

-- disk based (see also above)
BEGIN;
SET LOCAL work_mem = '100kB';

SELECT
    (array_agg(id ORDER BY id DESC NULLS FIRST))[0:5],
    (array_agg(abort_increasing ORDER BY abort_increasing DESC NULLS LAST))[0:5],
    (array_agg(id::text ORDER BY id::text DESC NULLS LAST))[0:5],
    percentile_disc(0.99) WITHIN GROUP (ORDER BY id),
    percentile_disc(0.01) WITHIN GROUP (ORDER BY id),
    percentile_disc(0.8) WITHIN GROUP (ORDER BY abort_increasing),
    percentile_disc(0.2) WITHIN GROUP (ORDER BY id::text),
    rank('00000000-0000-0000-0000-000000000000', '2', '2') WITHIN GROUP (ORDER BY noabort_increasing, id, id::text)
FROM (
    SELECT * FROM abbrev_abort_uuids
    UNION ALL
    SELECT NULL, NULL, NULL, NULL, NULL) s;

ROLLBACK;


----
-- test tuplesort mark/restore
---

CREATE TEMP TABLE test_mark_restore(col1 int, col2 int, col12 int);
-- need a few duplicates for mark/restore to matter
INSERT INTO test_mark_restore(col1, col2, col12)
   SELECT a.i, b.i, a.i * b.i FROM generate_series(1, 500) a(i), generate_series(1, 5) b(i);

BEGIN;

SET LOCAL enable_nestloop = off;
SET LOCAL enable_hashjoin = off;
SET LOCAL enable_material = off;

-- set query into variable once, to avoid repetition of the fairly long query
SELECT $$
    SELECT col12, count(distinct a.col1), count(distinct a.col2), count(distinct b.col1), count(distinct b.col2), count(*)
    FROM test_mark_restore a
        JOIN test_mark_restore b USING(col12)
    GROUP BY 1
    HAVING count(*) > 1
    ORDER BY 2 DESC, 1 DESC, 3 DESC, 4 DESC, 5 DESC, 6 DESC
    LIMIT 10
$$ AS qry \gset

-- test mark/restore with in-memory sorts
EXPLAIN (COSTS OFF) :qry;
:qry;

-- test mark/restore with on-disk sorts
SET LOCAL work_mem = '100kB';
EXPLAIN (COSTS OFF) :qry;
:qry;

COMMIT;