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Try to stabilize EXPLAIN output in partition_check test.

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Commit 7d8ac9814bc9bb6df2d845dbabed38d7284c7c2c adjusted these
tests in the hope of preserving the plan shape, but I failed to
notice that the three partitions were, on my local machine, choosing
two different plan shapes.  This is probably related to the fact
that all three tables have exactly the same row count.  Try to
improve the situation by making pht1_e about half as large as
the other two.

Per Tom Lane and the buildfarm.

Discussion: http://postgr.es/m/25380.1519277713@sss.pgh.pa.us
This commit is contained in:
Robert Haas 2018-02-22 08:51:00 -05:00
parent 7d8ac9814b
commit 9a5c4f58f3
2 changed files with 27 additions and 33 deletions
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58
src/test/regress/expected/partition_join.out
View File

@ -1285,13 +1285,13 @@ CREATE TABLE pht1_e (a int, b int, c text) PARTITION BY HASH(ltrim(c, 'A'));
CREATE TABLE pht1_e_p1 PARTITION OF pht1_e FOR VALUES WITH (MODULUS 3, REMAINDER 0);
CREATE TABLE pht1_e_p2 PARTITION OF pht1_e FOR VALUES WITH (MODULUS 3, REMAINDER 1);
CREATE TABLE pht1_e_p3 PARTITION OF pht1_e FOR VALUES WITH (MODULUS 3, REMAINDER 2);
INSERT INTO pht1_e SELECT i, i, 'A' || to_char(i/50, 'FM0000') FROM generate_series(0, 599, 2) i;
INSERT INTO pht1_e SELECT i, i, 'A' || to_char(i/50, 'FM0000') FROM generate_series(0, 299, 2) i;
ANALYZE pht1_e;
-- test partition matching with N-way join
EXPLAIN (COSTS OFF)
SELECT avg(t1.a), avg(t2.b), avg(t3.a + t3.b), t1.c, t2.c, t3.c FROM pht1 t1, pht2 t2, pht1_e t3 WHERE t1.b = t2.b AND t1.c = t2.c AND ltrim(t3.c, 'A') = t1.c GROUP BY t1.c, t2.c, t3.c ORDER BY t1.c, t2.c, t3.c;
QUERY PLAN
--------------------------------------------------------------------------------------------
QUERY PLAN
--------------------------------------------------------------------------------------
GroupAggregate
Group Key: t1.c, t2.c, t3.c
-> Sort
@ -1308,41 +1308,35 @@ SELECT avg(t1.a), avg(t2.b), avg(t3.a + t3.b), t1.c, t2.c, t3.c FROM pht1 t1, ph
-> Hash
-> Seq Scan on pht1_e_p1 t3
-> Hash Join
Hash Cond: (ltrim(t3_1.c, 'A'::text) = t1_1.c)
-> Seq Scan on pht1_e_p2 t3_1
Hash Cond: (t1_1.c = ltrim(t3_1.c, 'A'::text))
-> Hash Join
Hash Cond: ((t1_1.b = t2_1.b) AND (t1_1.c = t2_1.c))
-> Seq Scan on pht1_p2 t1_1
-> Hash
-> Seq Scan on pht2_p2 t2_1
-> Hash
-> Hash Join
Hash Cond: ((t1_1.b = t2_1.b) AND (t1_1.c = t2_1.c))
-> Seq Scan on pht1_p2 t1_1
-> Hash
-> Seq Scan on pht2_p2 t2_1
-> Seq Scan on pht1_e_p2 t3_1
-> Hash Join
Hash Cond: (ltrim(t3_2.c, 'A'::text) = t1_2.c)
-> Seq Scan on pht1_e_p3 t3_2
Hash Cond: (t1_2.c = ltrim(t3_2.c, 'A'::text))
-> Hash Join
Hash Cond: ((t1_2.b = t2_2.b) AND (t1_2.c = t2_2.c))
-> Seq Scan on pht1_p3 t1_2
-> Hash
-> Seq Scan on pht2_p3 t2_2
-> Hash
-> Hash Join
Hash Cond: ((t1_2.b = t2_2.b) AND (t1_2.c = t2_2.c))
-> Seq Scan on pht1_p3 t1_2
-> Hash
-> Seq Scan on pht2_p3 t2_2
-> Seq Scan on pht1_e_p3 t3_2
(33 rows)
SELECT avg(t1.a), avg(t2.b), avg(t3.a + t3.b), t1.c, t2.c, t3.c FROM pht1 t1, pht2 t2, pht1_e t3 WHERE t1.b = t2.b AND t1.c = t2.c AND ltrim(t3.c, 'A') = t1.c GROUP BY t1.c, t2.c, t3.c ORDER BY t1.c, t2.c, t3.c;
avg | avg | avg | c | c | c
----------------------+----------------------+-----------------------+------+------+-------
24.0000000000000000 | 24.0000000000000000 | 48.0000000000000000 | 0000 | 0000 | A0000
75.0000000000000000 | 75.0000000000000000 | 148.0000000000000000 | 0001 | 0001 | A0001
123.0000000000000000 | 123.0000000000000000 | 248.0000000000000000 | 0002 | 0002 | A0002
174.0000000000000000 | 174.0000000000000000 | 348.0000000000000000 | 0003 | 0003 | A0003
225.0000000000000000 | 225.0000000000000000 | 448.0000000000000000 | 0004 | 0004 | A0004
273.0000000000000000 | 273.0000000000000000 | 548.0000000000000000 | 0005 | 0005 | A0005
324.0000000000000000 | 324.0000000000000000 | 648.0000000000000000 | 0006 | 0006 | A0006
375.0000000000000000 | 375.0000000000000000 | 748.0000000000000000 | 0007 | 0007 | A0007
423.0000000000000000 | 423.0000000000000000 | 848.0000000000000000 | 0008 | 0008 | A0008
474.0000000000000000 | 474.0000000000000000 | 948.0000000000000000 | 0009 | 0009 | A0009
525.0000000000000000 | 525.0000000000000000 | 1048.0000000000000000 | 0010 | 0010 | A0010
573.0000000000000000 | 573.0000000000000000 | 1148.0000000000000000 | 0011 | 0011 | A0011
(12 rows)
avg | avg | avg | c | c | c
----------------------+----------------------+----------------------+------+------+-------
24.0000000000000000 | 24.0000000000000000 | 48.0000000000000000 | 0000 | 0000 | A0000
75.0000000000000000 | 75.0000000000000000 | 148.0000000000000000 | 0001 | 0001 | A0001
123.0000000000000000 | 123.0000000000000000 | 248.0000000000000000 | 0002 | 0002 | A0002
174.0000000000000000 | 174.0000000000000000 | 348.0000000000000000 | 0003 | 0003 | A0003
225.0000000000000000 | 225.0000000000000000 | 448.0000000000000000 | 0004 | 0004 | A0004
273.0000000000000000 | 273.0000000000000000 | 548.0000000000000000 | 0005 | 0005 | A0005
(6 rows)
--
-- multiple levels of partitioning

2
src/test/regress/sql/partition_join.sql
View File

@ -253,7 +253,7 @@ CREATE TABLE pht1_e (a int, b int, c text) PARTITION BY HASH(ltrim(c, 'A'));
CREATE TABLE pht1_e_p1 PARTITION OF pht1_e FOR VALUES WITH (MODULUS 3, REMAINDER 0);
CREATE TABLE pht1_e_p2 PARTITION OF pht1_e FOR VALUES WITH (MODULUS 3, REMAINDER 1);
CREATE TABLE pht1_e_p3 PARTITION OF pht1_e FOR VALUES WITH (MODULUS 3, REMAINDER 2);
INSERT INTO pht1_e SELECT i, i, 'A' || to_char(i/50, 'FM0000') FROM generate_series(0, 599, 2) i;
INSERT INTO pht1_e SELECT i, i, 'A' || to_char(i/50, 'FM0000') FROM generate_series(0, 299, 2) i;
ANALYZE pht1_e;
-- test partition matching with N-way join