postgres.git / summary / log / commit / refs
commit f5bb46fb2e65f951fe22c166756dab9743b33a8a
Author: Noah Misch <noah@leadboat.com>
Date: Sat Jul 13 15:09:33 2024 +0000
First released in: 18.0, 14.13, 15.8, 16.4, 17.0
Don't lose partitioned table reltuples=0 after relhassubclass=f.
ANALYZE sets relhassubclass=f when a partitioned table no longer has
partitions. An ANALYZE doing that proceeded to apply the inplace update
of pg_class.reltuples to the old pg_class tuple instead of the new
tuple, losing that reltuples=0 change if the ANALYZE committed.
Non-partitioning inheritance trees were unaffected. Back-patch to v14,
where commit 375aed36ad83f0e021e9bdd3a0034c0c992c66dc introduced
maintenance of partitioned table pg_class.reltuples.
Reported by Alexander Lakhin.
Discussion: https://postgr.es/m/a295b499-dcab-6a99-c06e-01cf60593344@gmail.com
src/backend/commands/analyze.c | 7 +++++-
src/test/regress/expected/vacuum.out | 47 ++++++++++++++++++++++++++++++++++++
src/test/regress/sql/vacuum.sql | 29 ++++++++++++++++++++++
3 files changed, 82 insertions(+), 1 deletion(-)
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 7d2cd249972..c590a2adc35 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -629,7 +629,11 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
else
relallvisible = 0;
- /* Update pg_class for table relation */
+ /*
+ * Update pg_class for table relation. CCI first, in case acquirefunc
+ * updated pg_class.
+ */
+ CommandCounterIncrement();
vac_update_relstats(onerel,
relpages,
totalrows,
@@ -664,6 +668,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
* Partitioned tables don't have storage, so we don't set any fields
* in their pg_class entries except for reltuples and relhasindex.
*/
+ CommandCounterIncrement();
vac_update_relstats(onerel, -1, totalrows,
0, hasindex, InvalidTransactionId,
InvalidMultiXactId,
diff --git a/src/test/regress/expected/vacuum.out b/src/test/regress/expected/vacuum.out
index 330fcd884c5..2eba7128876 100644
--- a/src/test/regress/expected/vacuum.out
+++ b/src/test/regress/expected/vacuum.out
@@ -82,6 +82,53 @@ BEGIN;
INSERT INTO vactst SELECT generate_series(301, 400);
DELETE FROM vactst WHERE i % 5 <> 0; -- delete a few rows inside
ANALYZE vactst;
+COMMIT;
+-- Test ANALYZE setting relhassubclass=f for non-partitioning inheritance
+BEGIN;
+CREATE TABLE past_inh_parent ();
+CREATE TABLE past_inh_child () INHERITS (past_inh_parent);
+INSERT INTO past_inh_child DEFAULT VALUES;
+INSERT INTO past_inh_child DEFAULT VALUES;
+ANALYZE past_inh_parent;
+SELECT reltuples, relhassubclass
+ FROM pg_class WHERE oid = 'past_inh_parent'::regclass;
+ reltuples | relhassubclass
+-----------+----------------
+ 0 | t
+(1 row)
+
+DROP TABLE past_inh_child;
+ANALYZE past_inh_parent;
+SELECT reltuples, relhassubclass
+ FROM pg_class WHERE oid = 'past_inh_parent'::regclass;
+ reltuples | relhassubclass
+-----------+----------------
+ 0 | f
+(1 row)
+
+COMMIT;
+-- Test ANALYZE setting relhassubclass=f for partitioning
+BEGIN;
+CREATE TABLE past_parted (i int) PARTITION BY LIST(i);
+CREATE TABLE past_part PARTITION OF past_parted FOR VALUES IN (1);
+INSERT INTO past_parted VALUES (1),(1);
+ANALYZE past_parted;
+DROP TABLE past_part;
+SELECT reltuples, relhassubclass
+ FROM pg_class WHERE oid = 'past_parted'::regclass;
+ reltuples | relhassubclass
+-----------+----------------
+ 2 | t
+(1 row)
+
+ANALYZE past_parted;
+SELECT reltuples, relhassubclass
+ FROM pg_class WHERE oid = 'past_parted'::regclass;
+ reltuples | relhassubclass
+-----------+----------------
+ 0 | f
+(1 row)
+
COMMIT;
VACUUM FULL pg_am;
VACUUM FULL pg_class;
diff --git a/src/test/regress/sql/vacuum.sql b/src/test/regress/sql/vacuum.sql
index 0b63ef8dc66..548cd7accac 100644
--- a/src/test/regress/sql/vacuum.sql
+++ b/src/test/regress/sql/vacuum.sql
@@ -67,6 +67,35 @@ DELETE FROM vactst WHERE i % 5 <> 0; -- delete a few rows inside
ANALYZE vactst;
COMMIT;
+-- Test ANALYZE setting relhassubclass=f for non-partitioning inheritance
+BEGIN;
+CREATE TABLE past_inh_parent ();
+CREATE TABLE past_inh_child () INHERITS (past_inh_parent);
+INSERT INTO past_inh_child DEFAULT VALUES;
+INSERT INTO past_inh_child DEFAULT VALUES;
+ANALYZE past_inh_parent;
+SELECT reltuples, relhassubclass
+ FROM pg_class WHERE oid = 'past_inh_parent'::regclass;
+DROP TABLE past_inh_child;
+ANALYZE past_inh_parent;
+SELECT reltuples, relhassubclass
+ FROM pg_class WHERE oid = 'past_inh_parent'::regclass;
+COMMIT;
+
+-- Test ANALYZE setting relhassubclass=f for partitioning
+BEGIN;
+CREATE TABLE past_parted (i int) PARTITION BY LIST(i);
+CREATE TABLE past_part PARTITION OF past_parted FOR VALUES IN (1);
+INSERT INTO past_parted VALUES (1),(1);
+ANALYZE past_parted;
+DROP TABLE past_part;
+SELECT reltuples, relhassubclass
+ FROM pg_class WHERE oid = 'past_parted'::regclass;
+ANALYZE past_parted;
+SELECT reltuples, relhassubclass
+ FROM pg_class WHERE oid = 'past_parted'::regclass;
+COMMIT;
+
VACUUM FULL pg_am;
VACUUM FULL pg_class;
VACUUM FULL pg_database;
[parent: dd12eb33aff9]