Attempt to stabilize partitionwise_aggregate test

In b07642db, we added code to trigger autovacuums based on the number of
INSERTs into a table. This seems to have cause some destabilization of
the regression tests. Likely this is due to an autovacuum triggering
mid-test and (per theory from Tom Lane) one of the test's queries causes
autovacuum to skip some number of pages, resulting in the reltuples
estimate changing.

The failure that this is attempting to fix is around the order of subnodes
in an Append. Since the planner orders these according to the subnode
cost, then it's possible that a small change in the reltuples value changes
the subnode's cost enough that it swaps position with one of its fellow
subnodes.

The failure here only seems to occur on slower buildfarm machines. In this
case, lousyjack, which seems have taken over 8 minutes to run just
the partitionwise_aggregate test. Such a slow run would increase the
chances that the autovacuum launcher would trigger a vacuum mid-test.
Faster machines run this test in sub second time, so have a much smaller
window for an autovacuum to trigger.

Here we fix this by disabling autovacuum on all tables created in the test.

Additionally, this reverts the change made in the
partitionwise_aggregate test in 2dc16efe.

Discussion: https://postgr.es/m/22297.1585797192@sss.pgh.pa.us

src/test/regress/expected/partition_aggregate.out

@@ -2,6 +2,9 @@
 -- PARTITION_AGGREGATE
 -- Test partitionwise aggregation on partitioned tables
 --
+-- Note: Various tests located within are sensitive to tables being
+-- auto-vacuumed while the tests are running.  For this reason we
+-- run autovacuum_enabled = off for all tables.
 -- Enable partitionwise aggregate, which by default is disabled.
 SET enable_partitionwise_aggregate TO true;
 -- Enable partitionwise join, which by default is disabled.
@@ -12,9 +15,9 @@ SET max_parallel_workers_per_gather TO 0;
 -- Tests for list partitioned tables.
 --
 CREATE TABLE pagg_tab (a int, b int, c text, d int) PARTITION BY LIST(c);
-CREATE TABLE pagg_tab_p1 PARTITION OF pagg_tab FOR VALUES IN ('0000', '0001', '0002', '0003');
-CREATE TABLE pagg_tab_p2 PARTITION OF pagg_tab FOR VALUES IN ('0004', '0005', '0006', '0007');
-CREATE TABLE pagg_tab_p3 PARTITION OF pagg_tab FOR VALUES IN ('0008', '0009', '0010', '0011');
+CREATE TABLE pagg_tab_p1 PARTITION OF pagg_tab FOR VALUES IN ('0000', '0001', '0002', '0003') WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_p2 PARTITION OF pagg_tab FOR VALUES IN ('0004', '0005', '0006', '0007') WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_p3 PARTITION OF pagg_tab FOR VALUES IN ('0008', '0009', '0010', '0011') WITH (autovacuum_enabled = off);
 INSERT INTO pagg_tab SELECT i % 20, i % 30, to_char(i % 12, 'FM0000'), i % 30 FROM generate_series(0, 2999) i;
 ANALYZE pagg_tab;
 -- When GROUP BY clause matches; full aggregation is performed for each partition.
@@ -397,13 +400,13 @@ SELECT a, sum(b order by a) FROM pagg_tab GROUP BY a ORDER BY 1, 2;
 
 -- JOIN query
 CREATE TABLE pagg_tab1(x int, y int) PARTITION BY RANGE(x);
-CREATE TABLE pagg_tab1_p1 PARTITION OF pagg_tab1 FOR VALUES FROM (0) TO (10);
-CREATE TABLE pagg_tab1_p2 PARTITION OF pagg_tab1 FOR VALUES FROM (10) TO (20);
-CREATE TABLE pagg_tab1_p3 PARTITION OF pagg_tab1 FOR VALUES FROM (20) TO (30);
+CREATE TABLE pagg_tab1_p1 PARTITION OF pagg_tab1 FOR VALUES FROM (0) TO (10) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab1_p2 PARTITION OF pagg_tab1 FOR VALUES FROM (10) TO (20) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab1_p3 PARTITION OF pagg_tab1 FOR VALUES FROM (20) TO (30) WITH (autovacuum_enabled = off);
 CREATE TABLE pagg_tab2(x int, y int) PARTITION BY RANGE(y);
-CREATE TABLE pagg_tab2_p1 PARTITION OF pagg_tab2 FOR VALUES FROM (0) TO (10);
-CREATE TABLE pagg_tab2_p2 PARTITION OF pagg_tab2 FOR VALUES FROM (10) TO (20);
-CREATE TABLE pagg_tab2_p3 PARTITION OF pagg_tab2 FOR VALUES FROM (20) TO (30);
+CREATE TABLE pagg_tab2_p1 PARTITION OF pagg_tab2 FOR VALUES FROM (0) TO (10) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab2_p2 PARTITION OF pagg_tab2 FOR VALUES FROM (10) TO (20) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab2_p3 PARTITION OF pagg_tab2 FOR VALUES FROM (20) TO (30) WITH (autovacuum_enabled = off);
 INSERT INTO pagg_tab1 SELECT i % 30, i % 20 FROM generate_series(0, 299, 2) i;
 INSERT INTO pagg_tab2 SELECT i % 20, i % 30 FROM generate_series(0, 299, 3) i;
 ANALYZE pagg_tab1;
@@ -817,9 +820,9 @@ SELECT a.x, a.y, count(*) FROM (SELECT * FROM pagg_tab1 WHERE x = 1 AND x = 2) a
 
 -- Partition by multiple columns
 CREATE TABLE pagg_tab_m (a int, b int, c int) PARTITION BY RANGE(a, ((a+b)/2));
-CREATE TABLE pagg_tab_m_p1 PARTITION OF pagg_tab_m FOR VALUES FROM (0, 0) TO (10, 10);
-CREATE TABLE pagg_tab_m_p2 PARTITION OF pagg_tab_m FOR VALUES FROM (10, 10) TO (20, 20);
-CREATE TABLE pagg_tab_m_p3 PARTITION OF pagg_tab_m FOR VALUES FROM (20, 20) TO (30, 30);
+CREATE TABLE pagg_tab_m_p1 PARTITION OF pagg_tab_m FOR VALUES FROM (0, 0) TO (10, 10) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_m_p2 PARTITION OF pagg_tab_m FOR VALUES FROM (10, 10) TO (20, 20) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_m_p3 PARTITION OF pagg_tab_m FOR VALUES FROM (20, 20) TO (30, 30) WITH (autovacuum_enabled = off);
 INSERT INTO pagg_tab_m SELECT i % 30, i % 40, i % 50 FROM generate_series(0, 2999) i;
 ANALYZE pagg_tab_m;
 -- Partial aggregation as GROUP BY clause does not match with PARTITION KEY
@@ -923,18 +926,18 @@ SELECT a, c, sum(b), avg(c), count(*) FROM pagg_tab_m GROUP BY (a+b)/2, 2, 1 HAV
 
 -- Test with multi-level partitioning scheme
 CREATE TABLE pagg_tab_ml (a int, b int, c text) PARTITION BY RANGE(a);
-CREATE TABLE pagg_tab_ml_p1 PARTITION OF pagg_tab_ml FOR VALUES FROM (0) TO (10);
+CREATE TABLE pagg_tab_ml_p1 PARTITION OF pagg_tab_ml FOR VALUES FROM (0) TO (10) WITH (autovacuum_enabled = off);
 CREATE TABLE pagg_tab_ml_p2 PARTITION OF pagg_tab_ml FOR VALUES FROM (10) TO (20) PARTITION BY LIST (c);
-CREATE TABLE pagg_tab_ml_p2_s1 PARTITION OF pagg_tab_ml_p2 FOR VALUES IN ('0000', '0001');
-CREATE TABLE pagg_tab_ml_p2_s2 PARTITION OF pagg_tab_ml_p2 FOR VALUES IN ('0002', '0003');
+CREATE TABLE pagg_tab_ml_p2_s1 PARTITION OF pagg_tab_ml_p2 FOR VALUES IN ('0000', '0001') WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_ml_p2_s2 PARTITION OF pagg_tab_ml_p2 FOR VALUES IN ('0002', '0003') WITH (autovacuum_enabled = off);
 -- This level of partitioning has different column positions than the parent
 CREATE TABLE pagg_tab_ml_p3(b int, c text, a int) PARTITION BY RANGE (b);
-CREATE TABLE pagg_tab_ml_p3_s1(c text, a int, b int);
-CREATE TABLE pagg_tab_ml_p3_s2 PARTITION OF pagg_tab_ml_p3 FOR VALUES FROM (5) TO (10);
+CREATE TABLE pagg_tab_ml_p3_s1(c text, a int, b int) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_ml_p3_s2 PARTITION OF pagg_tab_ml_p3 FOR VALUES FROM (5) TO (10) WITH (autovacuum_enabled = off);
 ALTER TABLE pagg_tab_ml_p3 ATTACH PARTITION pagg_tab_ml_p3_s1 FOR VALUES FROM (0) TO (5);
 ALTER TABLE pagg_tab_ml ATTACH PARTITION pagg_tab_ml_p3 FOR VALUES FROM (20) TO (30);
 INSERT INTO pagg_tab_ml SELECT i % 30, i % 10, to_char(i % 4, 'FM0000') FROM generate_series(0, 29999) i;
-VACUUM (ANALYZE) pagg_tab_ml;
+ANALYZE pagg_tab_ml;
 -- For Parallel Append
 SET max_parallel_workers_per_gather TO 2;
 -- Full aggregation at level 1 as GROUP BY clause matches with PARTITION KEY
@@ -1329,9 +1332,9 @@ SELECT a, sum(b), count(*) FROM pagg_tab_ml GROUP BY a, b, c HAVING avg(b) > 7 O
 -- costing such plans.
 SET parallel_setup_cost TO 10;
 CREATE TABLE pagg_tab_para(x int, y int) PARTITION BY RANGE(x);
-CREATE TABLE pagg_tab_para_p1 PARTITION OF pagg_tab_para FOR VALUES FROM (0) TO (10);
-CREATE TABLE pagg_tab_para_p2 PARTITION OF pagg_tab_para FOR VALUES FROM (10) TO (20);
-CREATE TABLE pagg_tab_para_p3 PARTITION OF pagg_tab_para FOR VALUES FROM (20) TO (30);
+CREATE TABLE pagg_tab_para_p1 PARTITION OF pagg_tab_para FOR VALUES FROM (0) TO (10) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_para_p2 PARTITION OF pagg_tab_para FOR VALUES FROM (10) TO (20) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_para_p3 PARTITION OF pagg_tab_para FOR VALUES FROM (20) TO (30) WITH (autovacuum_enabled = off);
 INSERT INTO pagg_tab_para SELECT i % 30, i % 20 FROM generate_series(0, 29999) i;
 ANALYZE pagg_tab_para;
 -- When GROUP BY clause matches; full aggregation is performed for each partition.

src/test/regress/sql/partition_aggregate.sql

@@ -2,6 +2,9 @@
 -- PARTITION_AGGREGATE
 -- Test partitionwise aggregation on partitioned tables
 --
+-- Note: Various tests located within are sensitive to tables being
+-- auto-vacuumed while the tests are running.  For this reason we
+-- run autovacuum_enabled = off for all tables.
 
 -- Enable partitionwise aggregate, which by default is disabled.
 SET enable_partitionwise_aggregate TO true;
@@ -14,9 +17,9 @@ SET max_parallel_workers_per_gather TO 0;
 -- Tests for list partitioned tables.
 --
 CREATE TABLE pagg_tab (a int, b int, c text, d int) PARTITION BY LIST(c);
-CREATE TABLE pagg_tab_p1 PARTITION OF pagg_tab FOR VALUES IN ('0000', '0001', '0002', '0003');
-CREATE TABLE pagg_tab_p2 PARTITION OF pagg_tab FOR VALUES IN ('0004', '0005', '0006', '0007');
-CREATE TABLE pagg_tab_p3 PARTITION OF pagg_tab FOR VALUES IN ('0008', '0009', '0010', '0011');
+CREATE TABLE pagg_tab_p1 PARTITION OF pagg_tab FOR VALUES IN ('0000', '0001', '0002', '0003') WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_p2 PARTITION OF pagg_tab FOR VALUES IN ('0004', '0005', '0006', '0007') WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_p3 PARTITION OF pagg_tab FOR VALUES IN ('0008', '0009', '0010', '0011') WITH (autovacuum_enabled = off);
 INSERT INTO pagg_tab SELECT i % 20, i % 30, to_char(i % 12, 'FM0000'), i % 30 FROM generate_series(0, 2999) i;
 ANALYZE pagg_tab;
 
@@ -91,14 +94,14 @@ SELECT a, sum(b order by a) FROM pagg_tab GROUP BY a ORDER BY 1, 2;
 -- JOIN query
 
 CREATE TABLE pagg_tab1(x int, y int) PARTITION BY RANGE(x);
-CREATE TABLE pagg_tab1_p1 PARTITION OF pagg_tab1 FOR VALUES FROM (0) TO (10);
-CREATE TABLE pagg_tab1_p2 PARTITION OF pagg_tab1 FOR VALUES FROM (10) TO (20);
-CREATE TABLE pagg_tab1_p3 PARTITION OF pagg_tab1 FOR VALUES FROM (20) TO (30);
+CREATE TABLE pagg_tab1_p1 PARTITION OF pagg_tab1 FOR VALUES FROM (0) TO (10) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab1_p2 PARTITION OF pagg_tab1 FOR VALUES FROM (10) TO (20) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab1_p3 PARTITION OF pagg_tab1 FOR VALUES FROM (20) TO (30) WITH (autovacuum_enabled = off);
 
 CREATE TABLE pagg_tab2(x int, y int) PARTITION BY RANGE(y);
-CREATE TABLE pagg_tab2_p1 PARTITION OF pagg_tab2 FOR VALUES FROM (0) TO (10);
-CREATE TABLE pagg_tab2_p2 PARTITION OF pagg_tab2 FOR VALUES FROM (10) TO (20);
-CREATE TABLE pagg_tab2_p3 PARTITION OF pagg_tab2 FOR VALUES FROM (20) TO (30);
+CREATE TABLE pagg_tab2_p1 PARTITION OF pagg_tab2 FOR VALUES FROM (0) TO (10) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab2_p2 PARTITION OF pagg_tab2 FOR VALUES FROM (10) TO (20) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab2_p3 PARTITION OF pagg_tab2 FOR VALUES FROM (20) TO (30) WITH (autovacuum_enabled = off);
 
 INSERT INTO pagg_tab1 SELECT i % 30, i % 20 FROM generate_series(0, 299, 2) i;
 INSERT INTO pagg_tab2 SELECT i % 20, i % 30 FROM generate_series(0, 299, 3) i;
@@ -174,9 +177,9 @@ SELECT a.x, a.y, count(*) FROM (SELECT * FROM pagg_tab1 WHERE x = 1 AND x = 2) a
 -- Partition by multiple columns
 
 CREATE TABLE pagg_tab_m (a int, b int, c int) PARTITION BY RANGE(a, ((a+b)/2));
-CREATE TABLE pagg_tab_m_p1 PARTITION OF pagg_tab_m FOR VALUES FROM (0, 0) TO (10, 10);
-CREATE TABLE pagg_tab_m_p2 PARTITION OF pagg_tab_m FOR VALUES FROM (10, 10) TO (20, 20);
-CREATE TABLE pagg_tab_m_p3 PARTITION OF pagg_tab_m FOR VALUES FROM (20, 20) TO (30, 30);
+CREATE TABLE pagg_tab_m_p1 PARTITION OF pagg_tab_m FOR VALUES FROM (0, 0) TO (10, 10) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_m_p2 PARTITION OF pagg_tab_m FOR VALUES FROM (10, 10) TO (20, 20) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_m_p3 PARTITION OF pagg_tab_m FOR VALUES FROM (20, 20) TO (30, 30) WITH (autovacuum_enabled = off);
 INSERT INTO pagg_tab_m SELECT i % 30, i % 40, i % 50 FROM generate_series(0, 2999) i;
 ANALYZE pagg_tab_m;
 
@@ -199,21 +202,21 @@ SELECT a, c, sum(b), avg(c), count(*) FROM pagg_tab_m GROUP BY (a+b)/2, 2, 1 HAV
 -- Test with multi-level partitioning scheme
 
 CREATE TABLE pagg_tab_ml (a int, b int, c text) PARTITION BY RANGE(a);
-CREATE TABLE pagg_tab_ml_p1 PARTITION OF pagg_tab_ml FOR VALUES FROM (0) TO (10);
+CREATE TABLE pagg_tab_ml_p1 PARTITION OF pagg_tab_ml FOR VALUES FROM (0) TO (10) WITH (autovacuum_enabled = off);
 CREATE TABLE pagg_tab_ml_p2 PARTITION OF pagg_tab_ml FOR VALUES FROM (10) TO (20) PARTITION BY LIST (c);
-CREATE TABLE pagg_tab_ml_p2_s1 PARTITION OF pagg_tab_ml_p2 FOR VALUES IN ('0000', '0001');
-CREATE TABLE pagg_tab_ml_p2_s2 PARTITION OF pagg_tab_ml_p2 FOR VALUES IN ('0002', '0003');
+CREATE TABLE pagg_tab_ml_p2_s1 PARTITION OF pagg_tab_ml_p2 FOR VALUES IN ('0000', '0001') WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_ml_p2_s2 PARTITION OF pagg_tab_ml_p2 FOR VALUES IN ('0002', '0003') WITH (autovacuum_enabled = off);
 
 -- This level of partitioning has different column positions than the parent
 CREATE TABLE pagg_tab_ml_p3(b int, c text, a int) PARTITION BY RANGE (b);
-CREATE TABLE pagg_tab_ml_p3_s1(c text, a int, b int);
-CREATE TABLE pagg_tab_ml_p3_s2 PARTITION OF pagg_tab_ml_p3 FOR VALUES FROM (5) TO (10);
+CREATE TABLE pagg_tab_ml_p3_s1(c text, a int, b int) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_ml_p3_s2 PARTITION OF pagg_tab_ml_p3 FOR VALUES FROM (5) TO (10) WITH (autovacuum_enabled = off);
 
 ALTER TABLE pagg_tab_ml_p3 ATTACH PARTITION pagg_tab_ml_p3_s1 FOR VALUES FROM (0) TO (5);
 ALTER TABLE pagg_tab_ml ATTACH PARTITION pagg_tab_ml_p3 FOR VALUES FROM (20) TO (30);
 
 INSERT INTO pagg_tab_ml SELECT i % 30, i % 10, to_char(i % 4, 'FM0000') FROM generate_series(0, 29999) i;
-VACUUM (ANALYZE) pagg_tab_ml;
+ANALYZE pagg_tab_ml;
 
 -- For Parallel Append
 SET max_parallel_workers_per_gather TO 2;
@@ -284,9 +287,9 @@ SELECT a, sum(b), count(*) FROM pagg_tab_ml GROUP BY a, b, c HAVING avg(b) > 7 O
 SET parallel_setup_cost TO 10;
 
 CREATE TABLE pagg_tab_para(x int, y int) PARTITION BY RANGE(x);
-CREATE TABLE pagg_tab_para_p1 PARTITION OF pagg_tab_para FOR VALUES FROM (0) TO (10);
-CREATE TABLE pagg_tab_para_p2 PARTITION OF pagg_tab_para FOR VALUES FROM (10) TO (20);
-CREATE TABLE pagg_tab_para_p3 PARTITION OF pagg_tab_para FOR VALUES FROM (20) TO (30);
+CREATE TABLE pagg_tab_para_p1 PARTITION OF pagg_tab_para FOR VALUES FROM (0) TO (10) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_para_p2 PARTITION OF pagg_tab_para FOR VALUES FROM (10) TO (20) WITH (autovacuum_enabled = off);
+CREATE TABLE pagg_tab_para_p3 PARTITION OF pagg_tab_para FOR VALUES FROM (20) TO (30) WITH (autovacuum_enabled = off);
 
 INSERT INTO pagg_tab_para SELECT i % 30, i % 20 FROM generate_series(0, 29999) i;