Adding upstream version 16.2.upstream/16.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 110 insertions, 0 deletions

diff --git a/src/test/regress/sql/tablesample.sql b/src/test/regress/sql/tablesample.sql
new file mode 100644
index 0000000..aa17994
--- /dev/null
+++ b/src/test/regress/sql/tablesample.sql
@@ -0,0 +1,110 @@
+CREATE TABLE test_tablesample (id int, name text) WITH (fillfactor=10);
+-- use fillfactor so we don't have to load too much data to get multiple pages
+
+INSERT INTO test_tablesample
+  SELECT i, repeat(i::text, 200) FROM generate_series(0, 9) s(i);
+
+SELECT t.id FROM test_tablesample AS t TABLESAMPLE SYSTEM (50) REPEATABLE (0);
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (100.0/11) REPEATABLE (0);
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (0);
+SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (50) REPEATABLE (0);
+SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (5.5) REPEATABLE (0);
+
+-- 100% should give repeatable count results (ie, all rows) in any case
+SELECT count(*) FROM test_tablesample TABLESAMPLE SYSTEM (100);
+SELECT count(*) FROM test_tablesample TABLESAMPLE SYSTEM (100) REPEATABLE (1+2);
+SELECT count(*) FROM test_tablesample TABLESAMPLE SYSTEM (100) REPEATABLE (0.4);
+
+CREATE VIEW test_tablesample_v1 AS
+  SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (10*2) REPEATABLE (2);
+CREATE VIEW test_tablesample_v2 AS
+  SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (99);
+\d+ test_tablesample_v1
+\d+ test_tablesample_v2
+
+-- check a sampled query doesn't affect cursor in progress
+BEGIN;
+DECLARE tablesample_cur SCROLL CURSOR FOR
+  SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (0);
+
+FETCH FIRST FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (0);
+
+FETCH NEXT FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+
+FETCH FIRST FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+FETCH NEXT FROM tablesample_cur;
+
+CLOSE tablesample_cur;
+END;
+
+EXPLAIN (COSTS OFF)
+  SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (2);
+EXPLAIN (COSTS OFF)
+  SELECT * FROM test_tablesample_v1;
+
+-- check inheritance behavior
+explain (costs off)
+  select count(*) from person tablesample bernoulli (100);
+select count(*) from person tablesample bernoulli (100);
+select count(*) from person;
+
+-- check that collations get assigned within the tablesample arguments
+SELECT count(*) FROM test_tablesample TABLESAMPLE bernoulli (('1'::text < '0'::text)::int);
+
+-- check behavior during rescans, as well as correct handling of min/max pct
+select * from
+  (values (0),(100)) v(pct),
+  lateral (select count(*) from tenk1 tablesample bernoulli (pct)) ss;
+select * from
+  (values (0),(100)) v(pct),
+  lateral (select count(*) from tenk1 tablesample system (pct)) ss;
+explain (costs off)
+select pct, count(unique1) from
+  (values (0),(100)) v(pct),
+  lateral (select * from tenk1 tablesample bernoulli (pct)) ss
+  group by pct;
+select pct, count(unique1) from
+  (values (0),(100)) v(pct),
+  lateral (select * from tenk1 tablesample bernoulli (pct)) ss
+  group by pct;
+select pct, count(unique1) from
+  (values (0),(100)) v(pct),
+  lateral (select * from tenk1 tablesample system (pct)) ss
+  group by pct;
+
+-- errors
+SELECT id FROM test_tablesample TABLESAMPLE FOOBAR (1);
+
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (NULL);
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (NULL);
+
+SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (-1);
+SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (200);
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (-1);
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (200);
+
+SELECT id FROM test_tablesample_v1 TABLESAMPLE BERNOULLI (1);
+INSERT INTO test_tablesample_v1 VALUES(1);
+
+WITH query_select AS (SELECT * FROM test_tablesample)
+SELECT * FROM query_select TABLESAMPLE BERNOULLI (5.5) REPEATABLE (1);
+
+SELECT q.* FROM (SELECT * FROM test_tablesample) as q TABLESAMPLE BERNOULLI (5);
+
+-- check partitioned tables support tablesample
+create table parted_sample (a int) partition by list (a);
+create table parted_sample_1 partition of parted_sample for values in (1);
+create table parted_sample_2 partition of parted_sample for values in (2);
+explain (costs off)
+  select * from parted_sample tablesample bernoulli (100);
+drop table parted_sample, parted_sample_1, parted_sample_2;