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-rw-r--r--src/test/regress/expected/rowsecurity.out24
-rw-r--r--src/test/regress/expected/rules.out4
-rw-r--r--src/test/regress/expected/sanity_check.out1
-rw-r--r--src/test/regress/expected/tablesample.out284
-rw-r--r--src/test/regress/output/misc.source5
-rw-r--r--src/test/regress/serial_schedule2
-rw-r--r--src/test/regress/sql/rowsecurity.sql8
-rw-r--r--src/test/regress/sql/tablesample.sql90
8 files changed, 271 insertions, 147 deletions
diff --git a/src/test/regress/expected/rowsecurity.out b/src/test/regress/expected/rowsecurity.out
index 414299a6941..e7c242cd22d 100644
--- a/src/test/regress/expected/rowsecurity.out
+++ b/src/test/regress/expected/rowsecurity.out
@@ -101,15 +101,17 @@ NOTICE: f_leak => great manga
44 | 8 | 1 | rls_regress_user2 | great manga | manga
(4 rows)
-SELECT * FROM document TABLESAMPLE BERNOULLI (50) REPEATABLE(1) WHERE f_leak(dtitle) ORDER BY did;
-NOTICE: f_leak => my first novel
+-- try a sampled version
+SELECT * FROM document TABLESAMPLE BERNOULLI(50) REPEATABLE(0)
+ WHERE f_leak(dtitle) ORDER BY did;
NOTICE: f_leak => my first manga
NOTICE: f_leak => great science fiction
+NOTICE: f_leak => great manga
did | cid | dlevel | dauthor | dtitle
-----+-----+--------+-------------------+-----------------------
- 1 | 11 | 1 | rls_regress_user1 | my first novel
4 | 44 | 1 | rls_regress_user1 | my first manga
6 | 22 | 1 | rls_regress_user2 | great science fiction
+ 8 | 44 | 1 | rls_regress_user2 | great manga
(3 rows)
-- viewpoint from rls_regress_user2
@@ -156,20 +158,20 @@ NOTICE: f_leak => great manga
44 | 8 | 1 | rls_regress_user2 | great manga | manga
(8 rows)
-SELECT * FROM document TABLESAMPLE BERNOULLI (50) REPEATABLE(1) WHERE f_leak(dtitle) ORDER BY did;
-NOTICE: f_leak => my first novel
-NOTICE: f_leak => my second novel
+-- try a sampled version
+SELECT * FROM document TABLESAMPLE BERNOULLI(50) REPEATABLE(0)
+ WHERE f_leak(dtitle) ORDER BY did;
NOTICE: f_leak => my first manga
+NOTICE: f_leak => my second manga
NOTICE: f_leak => great science fiction
-NOTICE: f_leak => great technology book
+NOTICE: f_leak => great manga
did | cid | dlevel | dauthor | dtitle
-----+-----+--------+-------------------+-----------------------
- 1 | 11 | 1 | rls_regress_user1 | my first novel
- 2 | 11 | 2 | rls_regress_user1 | my second novel
4 | 44 | 1 | rls_regress_user1 | my first manga
+ 5 | 44 | 2 | rls_regress_user1 | my second manga
6 | 22 | 1 | rls_regress_user2 | great science fiction
- 7 | 33 | 2 | rls_regress_user2 | great technology book
-(5 rows)
+ 8 | 44 | 1 | rls_regress_user2 | great manga
+(4 rows)
EXPLAIN (COSTS OFF) SELECT * FROM document WHERE f_leak(dtitle);
QUERY PLAN
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index cd5337531d4..1e5b0b9a2c4 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -2202,6 +2202,10 @@ street| SELECT r.name,
FROM ONLY road r,
real_city c
WHERE (c.outline ## r.thepath);
+test_tablesample_v1| SELECT test_tablesample.id
+ FROM test_tablesample TABLESAMPLE system ((10 * 2)) REPEATABLE (2);
+test_tablesample_v2| SELECT test_tablesample.id
+ FROM test_tablesample TABLESAMPLE system (99);
toyemp| SELECT emp.name,
emp.age,
emp.location,
diff --git a/src/test/regress/expected/sanity_check.out b/src/test/regress/expected/sanity_check.out
index 14acd16da3b..eb0bc88ef1f 100644
--- a/src/test/regress/expected/sanity_check.out
+++ b/src/test/regress/expected/sanity_check.out
@@ -128,7 +128,6 @@ pg_shdepend|t
pg_shdescription|t
pg_shseclabel|t
pg_statistic|t
-pg_tablesample_method|t
pg_tablespace|t
pg_transform|t
pg_trigger|t
diff --git a/src/test/regress/expected/tablesample.out b/src/test/regress/expected/tablesample.out
index 04e5eb8b807..727a8354397 100644
--- a/src/test/regress/expected/tablesample.out
+++ b/src/test/regress/expected/tablesample.out
@@ -1,107 +1,123 @@
-CREATE TABLE test_tablesample (id int, name text) WITH (fillfactor=10); -- force smaller pages 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) ORDER BY i;
-SELECT t.id FROM test_tablesample AS t TABLESAMPLE SYSTEM (50) REPEATABLE (10);
+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);
id
----
- 0
- 1
- 2
3
4
5
- 9
-(7 rows)
-
-SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (100.0/11) REPEATABLE (9999);
- id
-----
6
7
8
-(3 rows)
+(6 rows)
-SELECT count(*) FROM test_tablesample TABLESAMPLE SYSTEM (100);
- count
--------
- 10
-(1 row)
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (100.0/11) REPEATABLE (0);
+ id
+----
+(0 rows)
-SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (100);
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (0);
id
----
- 0
- 1
- 2
+ 3
+ 4
+ 5
6
7
8
- 9
-(7 rows)
+(6 rows)
-SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (50) REPEATABLE (100);
+SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (50) REPEATABLE (0);
id
----
- 0
- 1
- 3
4
5
+ 6
+ 7
+ 8
(5 rows)
-SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (5.5) REPEATABLE (1);
+SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (5.5) REPEATABLE (0);
id
----
- 0
- 5
-(2 rows)
+ 7
+(1 row)
-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);
-SELECT pg_get_viewdef('test_tablesample_v1'::regclass);
- pg_get_viewdef
---------------------------------------------------------------------------------
- SELECT test_tablesample.id +
- FROM test_tablesample TABLESAMPLE system (((10 * 2))::real) REPEATABLE (2);
+-- 100% should give repeatable count results (ie, all rows) in any case
+SELECT count(*) FROM test_tablesample TABLESAMPLE SYSTEM (100);
+ count
+-------
+ 10
(1 row)
-SELECT pg_get_viewdef('test_tablesample_v2'::regclass);
- pg_get_viewdef
------------------------------------------------------------
- SELECT test_tablesample.id +
- FROM test_tablesample TABLESAMPLE system ((99)::real);
+SELECT count(*) FROM test_tablesample TABLESAMPLE SYSTEM (100) REPEATABLE (1+2);
+ count
+-------
+ 10
+(1 row)
+
+SELECT count(*) FROM test_tablesample TABLESAMPLE SYSTEM (100) REPEATABLE (0.4);
+ count
+-------
+ 10
(1 row)
+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
+ View "public.test_tablesample_v1"
+ Column | Type | Modifiers | Storage | Description
+--------+---------+-----------+---------+-------------
+ id | integer | | plain |
+View definition:
+ SELECT test_tablesample.id
+ FROM test_tablesample TABLESAMPLE system ((10 * 2)) REPEATABLE (2);
+
+\d+ test_tablesample_v2
+ View "public.test_tablesample_v2"
+ Column | Type | Modifiers | Storage | Description
+--------+---------+-----------+---------+-------------
+ id | integer | | plain |
+View definition:
+ SELECT test_tablesample.id
+ FROM test_tablesample TABLESAMPLE system (99);
+
+-- check a sampled query doesn't affect cursor in progress
BEGIN;
-DECLARE tablesample_cur CURSOR FOR SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (100);
+DECLARE tablesample_cur CURSOR FOR
+ SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (0);
FETCH FIRST FROM tablesample_cur;
id
----
- 0
+ 3
(1 row)
FETCH NEXT FROM tablesample_cur;
id
----
- 1
+ 4
(1 row)
FETCH NEXT FROM tablesample_cur;
id
----
- 2
+ 5
(1 row)
-SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (10);
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (0);
id
----
- 0
- 1
- 2
3
4
5
- 9
-(7 rows)
+ 6
+ 7
+ 8
+(6 rows)
FETCH NEXT FROM tablesample_cur;
id
@@ -124,19 +140,19 @@ FETCH NEXT FROM tablesample_cur;
FETCH FIRST FROM tablesample_cur;
id
----
- 0
+ 3
(1 row)
FETCH NEXT FROM tablesample_cur;
id
----
- 1
+ 4
(1 row)
FETCH NEXT FROM tablesample_cur;
id
----
- 2
+ 5
(1 row)
FETCH NEXT FROM tablesample_cur;
@@ -159,41 +175,129 @@ FETCH NEXT FROM tablesample_cur;
CLOSE tablesample_cur;
END;
-EXPLAIN SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (10);
- QUERY PLAN
--------------------------------------------------------------------------------
- Sample Scan (system) on test_tablesample (cost=0.00..26.35 rows=635 width=4)
+EXPLAIN (COSTS OFF)
+ SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (2);
+ QUERY PLAN
+--------------------------------------------------------------------
+ Sample Scan on test_tablesample
+ Sampling: system ('50'::real) REPEATABLE ('2'::double precision)
+(2 rows)
+
+EXPLAIN (COSTS OFF)
+ SELECT * FROM test_tablesample_v1;
+ QUERY PLAN
+--------------------------------------------------------------------
+ Sample Scan on test_tablesample
+ Sampling: system ('20'::real) REPEATABLE ('2'::double precision)
+(2 rows)
+
+-- check inheritance behavior
+explain (costs off)
+ select count(*) from person tablesample bernoulli (100);
+ QUERY PLAN
+-------------------------------------------------
+ Aggregate
+ -> Append
+ -> Sample Scan on person
+ Sampling: bernoulli ('100'::real)
+ -> Sample Scan on emp
+ Sampling: bernoulli ('100'::real)
+ -> Sample Scan on student
+ Sampling: bernoulli ('100'::real)
+ -> Sample Scan on stud_emp
+ Sampling: bernoulli ('100'::real)
+(10 rows)
+
+select count(*) from person tablesample bernoulli (100);
+ count
+-------
+ 58
(1 row)
-EXPLAIN SELECT * FROM test_tablesample_v1;
- QUERY PLAN
--------------------------------------------------------------------------------
- Sample Scan (system) on test_tablesample (cost=0.00..10.54 rows=254 width=4)
+select count(*) from person;
+ count
+-------
+ 58
+(1 row)
+
+-- check that collations get assigned within the tablesample arguments
+SELECT count(*) FROM test_tablesample TABLESAMPLE bernoulli (('1'::text < '0'::text)::int);
+ count
+-------
+ 0
+(1 row)
+
+-- 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;
+ pct | count
+-----+-------
+ 0 | 0
+ 100 | 10000
+(2 rows)
+
+select * from
+ (values (0),(100)) v(pct),
+ lateral (select count(*) from tenk1 tablesample system (pct)) ss;
+ pct | count
+-----+-------
+ 0 | 0
+ 100 | 10000
+(2 rows)
+
+explain (costs off)
+select pct, count(unique1) from
+ (values (0),(100)) v(pct),
+ lateral (select * from tenk1 tablesample bernoulli (pct)) ss
+ group by pct;
+ QUERY PLAN
+--------------------------------------------------------
+ HashAggregate
+ Group Key: "*VALUES*".column1
+ -> Nested Loop
+ -> Values Scan on "*VALUES*"
+ -> Sample Scan on tenk1
+ Sampling: bernoulli ("*VALUES*".column1)
+(6 rows)
+
+select pct, count(unique1) from
+ (values (0),(100)) v(pct),
+ lateral (select * from tenk1 tablesample bernoulli (pct)) ss
+ group by pct;
+ pct | count
+-----+-------
+ 100 | 10000
+(1 row)
+
+select pct, count(unique1) from
+ (values (0),(100)) v(pct),
+ lateral (select * from tenk1 tablesample system (pct)) ss
+ group by pct;
+ pct | count
+-----+-------
+ 100 | 10000
(1 row)
-- errors
SELECT id FROM test_tablesample TABLESAMPLE FOOBAR (1);
-ERROR: tablesample method "foobar" does not exist
+ERROR: tablesample method foobar does not exist
LINE 1: SELECT id FROM test_tablesample TABLESAMPLE FOOBAR (1);
- ^
+ ^
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (NULL);
+ERROR: TABLESAMPLE parameter cannot be null
SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (NULL);
-ERROR: REPEATABLE clause must be NOT NULL numeric value
-LINE 1: ... test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (NULL);
- ^
+ERROR: TABLESAMPLE REPEATABLE parameter cannot be null
SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (-1);
-ERROR: invalid sample size
-HINT: Sample size must be numeric value between 0 and 100 (inclusive).
+ERROR: sample percentage must be between 0 and 100
SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (200);
-ERROR: invalid sample size
-HINT: Sample size must be numeric value between 0 and 100 (inclusive).
+ERROR: sample percentage must be between 0 and 100
SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (-1);
-ERROR: invalid sample size
-HINT: Sample size must be numeric value between 0 and 100 (inclusive).
+ERROR: sample percentage must be between 0 and 100
SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (200);
-ERROR: invalid sample size
-HINT: Sample size must be numeric value between 0 and 100 (inclusive).
+ERROR: sample percentage must be between 0 and 100
SELECT id FROM test_tablesample_v1 TABLESAMPLE BERNOULLI (1);
-ERROR: TABLESAMPLE clause can only be used on tables and materialized views
+ERROR: TABLESAMPLE clause can only be applied to tables and materialized views
LINE 1: SELECT id FROM test_tablesample_v1 TABLESAMPLE BERNOULLI (1)...
^
INSERT INTO test_tablesample_v1 VALUES(1);
@@ -202,30 +306,10 @@ DETAIL: Views containing TABLESAMPLE are not automatically updatable.
HINT: To enable inserting into the view, provide an INSTEAD OF INSERT trigger or an unconditional ON INSERT DO INSTEAD rule.
WITH query_select AS (SELECT * FROM test_tablesample)
SELECT * FROM query_select TABLESAMPLE BERNOULLI (5.5) REPEATABLE (1);
-ERROR: TABLESAMPLE clause can only be used on tables and materialized views
+ERROR: TABLESAMPLE clause can only be applied to tables and materialized views
LINE 2: SELECT * FROM query_select TABLESAMPLE BERNOULLI (5.5) REPEA...
^
SELECT q.* FROM (SELECT * FROM test_tablesample) as q TABLESAMPLE BERNOULLI (5);
ERROR: syntax error at or near "TABLESAMPLE"
LINE 1: ...CT q.* FROM (SELECT * FROM test_tablesample) as q TABLESAMPL...
^
--- catalog sanity
-SELECT *
-FROM pg_tablesample_method
-WHERE tsminit IS NULL
- OR tsmseqscan IS NULL
- OR tsmpagemode IS NULL
- OR tsmnextblock IS NULL
- OR tsmnexttuple IS NULL
- OR tsmend IS NULL
- OR tsmreset IS NULL
- OR tsmcost IS NULL;
- tsmname | tsmseqscan | tsmpagemode | tsminit | tsmnextblock | tsmnexttuple | tsmexaminetuple | tsmend | tsmreset | tsmcost
----------+------------+-------------+---------+--------------+--------------+-----------------+--------+----------+---------
-(0 rows)
-
--- done
-DROP TABLE test_tablesample CASCADE;
-NOTICE: drop cascades to 2 other objects
-DETAIL: drop cascades to view test_tablesample_v1
-drop cascades to view test_tablesample_v2
diff --git a/src/test/regress/output/misc.source b/src/test/regress/output/misc.source
index 70c9cc356a6..9eedb363d06 100644
--- a/src/test/regress/output/misc.source
+++ b/src/test/regress/output/misc.source
@@ -686,6 +686,9 @@ SELECT user_relns() AS user_relns
test_range_excl
test_range_gist
test_range_spgist
+ test_tablesample
+ test_tablesample_v1
+ test_tablesample_v2
test_tsvector
testjsonb
text_tbl
@@ -705,7 +708,7 @@ SELECT user_relns() AS user_relns
tvvmv
varchar_tbl
xacttest
-(127 rows)
+(130 rows)
SELECT name(equipment(hobby_construct(text 'skywalking', text 'mer')));
name
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 3a607cff46c..15d74d4e6eb 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -110,6 +110,7 @@ test: lock
test: replica_identity
test: rowsecurity
test: object_address
+test: tablesample
test: alter_generic
test: alter_operator
test: misc
@@ -156,4 +157,3 @@ test: with
test: xml
test: event_trigger
test: stats
-test: tablesample
diff --git a/src/test/regress/sql/rowsecurity.sql b/src/test/regress/sql/rowsecurity.sql
index 039070b85b7..e86f8143142 100644
--- a/src/test/regress/sql/rowsecurity.sql
+++ b/src/test/regress/sql/rowsecurity.sql
@@ -94,14 +94,18 @@ SET row_security TO ON;
SELECT * FROM document WHERE f_leak(dtitle) ORDER BY did;
SELECT * FROM document NATURAL JOIN category WHERE f_leak(dtitle) ORDER BY did;
-SELECT * FROM document TABLESAMPLE BERNOULLI (50) REPEATABLE(1) WHERE f_leak(dtitle) ORDER BY did;
+-- try a sampled version
+SELECT * FROM document TABLESAMPLE BERNOULLI(50) REPEATABLE(0)
+ WHERE f_leak(dtitle) ORDER BY did;
-- viewpoint from rls_regress_user2
SET SESSION AUTHORIZATION rls_regress_user2;
SELECT * FROM document WHERE f_leak(dtitle) ORDER BY did;
SELECT * FROM document NATURAL JOIN category WHERE f_leak(dtitle) ORDER BY did;
-SELECT * FROM document TABLESAMPLE BERNOULLI (50) REPEATABLE(1) WHERE f_leak(dtitle) ORDER BY did;
+-- try a sampled version
+SELECT * FROM document TABLESAMPLE BERNOULLI(50) REPEATABLE(0)
+ WHERE f_leak(dtitle) ORDER BY did;
EXPLAIN (COSTS OFF) SELECT * FROM document WHERE f_leak(dtitle);
EXPLAIN (COSTS OFF) SELECT * FROM document NATURAL JOIN category WHERE f_leak(dtitle);
diff --git a/src/test/regress/sql/tablesample.sql b/src/test/regress/sql/tablesample.sql
index 7b3eb9bedf7..eec97934966 100644
--- a/src/test/regress/sql/tablesample.sql
+++ b/src/test/regress/sql/tablesample.sql
@@ -1,26 +1,37 @@
-CREATE TABLE test_tablesample (id int, name text) WITH (fillfactor=10); -- force smaller pages so we don't have to load too much data to get multiple pages
+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) ORDER BY i;
+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 (10);
-SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (100.0/11) REPEATABLE (9999);
+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 id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (100);
-SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (50) REPEATABLE (100);
-SELECT id FROM test_tablesample TABLESAMPLE BERNOULLI (5.5) REPEATABLE (1);
+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);
-SELECT pg_get_viewdef('test_tablesample_v1'::regclass);
-SELECT pg_get_viewdef('test_tablesample_v2'::regclass);
+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 CURSOR FOR SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (100);
+DECLARE tablesample_cur 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 (10);
+SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (0);
FETCH NEXT FROM tablesample_cur;
FETCH NEXT FROM tablesample_cur;
@@ -36,12 +47,45 @@ FETCH NEXT FROM tablesample_cur;
CLOSE tablesample_cur;
END;
-EXPLAIN SELECT id FROM test_tablesample TABLESAMPLE SYSTEM (50) REPEATABLE (10);
-EXPLAIN SELECT * FROM test_tablesample_v1;
+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);
@@ -56,19 +100,3 @@ 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);
-
--- catalog sanity
-
-SELECT *
-FROM pg_tablesample_method
-WHERE tsminit IS NULL
- OR tsmseqscan IS NULL
- OR tsmpagemode IS NULL
- OR tsmnextblock IS NULL
- OR tsmnexttuple IS NULL
- OR tsmend IS NULL
- OR tsmreset IS NULL
- OR tsmcost IS NULL;
-
--- done
-DROP TABLE test_tablesample CASCADE;
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-21 05:03:35 +0000