From e98a4de7d23a54a6c861795ad8e920a59613e08b Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Tue, 27 Feb 2018 15:56:51 -0500 Subject: [PATCH] Use the correct tuplestore read pointer in a NamedTuplestoreScan. Tom Kazimiers reported that transition tables don't work correctly when they are scanned by more than one executor node. That's because commit 18ce3a4ab allocated separate read pointers for each executor node, as it must, but failed to make them active at the appropriate times. Repair. Thomas Munro Discussion: https://postgr.es/m/20180224034748.bixarv6632vbxgeb%40dewberry.localdomain --- .../executor/nodeNamedtuplestorescan.c | 2 ++ src/test/regress/expected/plpgsql.out | 22 ++++++++++++++++ src/test/regress/sql/plpgsql.sql | 26 +++++++++++++++++++ 3 files changed, 50 insertions(+) diff --git a/src/backend/executor/nodeNamedtuplestorescan.c b/src/backend/executor/nodeNamedtuplestorescan.c index 4d898b1f83..b260ad2594 100644 --- a/src/backend/executor/nodeNamedtuplestorescan.c +++ b/src/backend/executor/nodeNamedtuplestorescan.c @@ -40,6 +40,7 @@ NamedTuplestoreScanNext(NamedTuplestoreScanState *node) * Get the next tuple from tuplestore. Return NULL if no more tuples. */ slot = node->ss.ss_ScanTupleSlot; + tuplestore_select_read_pointer(node->relation, node->readptr); (void) tuplestore_gettupleslot(node->relation, true, false, slot); return slot; } @@ -116,6 +117,7 @@ ExecInitNamedTuplestoreScan(NamedTuplestoreScan *node, EState *estate, int eflag * The new read pointer copies its position from read pointer 0, which * could be anywhere, so explicitly rewind it. */ + tuplestore_select_read_pointer(scanstate->relation, scanstate->readptr); tuplestore_rescan(scanstate->relation); /* diff --git a/src/test/regress/expected/plpgsql.out b/src/test/regress/expected/plpgsql.out index d294e53634..722715049c 100644 --- a/src/test/regress/expected/plpgsql.out +++ b/src/test/regress/expected/plpgsql.out @@ -5559,6 +5559,28 @@ LINE 1: SELECT (SELECT string_agg(id || '=' || name, ',') FROM d) QUERY: SELECT (SELECT string_agg(id || '=' || name, ',') FROM d) CONTEXT: PL/pgSQL function alter_table_under_transition_tables_upd_func() line 3 at RAISE -- +-- Test multiple reference to a transition table +-- +CREATE TABLE multi_test (i int); +INSERT INTO multi_test VALUES (1); +CREATE OR REPLACE FUNCTION multi_test_trig() RETURNS trigger +LANGUAGE plpgsql AS $$ +BEGIN + RAISE NOTICE 'count = %', (SELECT COUNT(*) FROM new_test); + RAISE NOTICE 'count union = %', + (SELECT COUNT(*) + FROM (SELECT * FROM new_test UNION ALL SELECT * FROM new_test) ss); + RETURN NULL; +END$$; +CREATE TRIGGER my_trigger AFTER UPDATE ON multi_test + REFERENCING NEW TABLE AS new_test OLD TABLE as old_test + FOR EACH STATEMENT EXECUTE PROCEDURE multi_test_trig(); +UPDATE multi_test SET i = i; +NOTICE: count = 1 +NOTICE: count union = 2 +DROP TABLE multi_test; +DROP FUNCTION multi_test_trig(); +-- -- Check type parsing and record fetching from partitioned tables -- CREATE TABLE partitioned_table (a int, b text) PARTITION BY LIST (a); diff --git a/src/test/regress/sql/plpgsql.sql b/src/test/regress/sql/plpgsql.sql index f17cf0b49b..f405d157bb 100644 --- a/src/test/regress/sql/plpgsql.sql +++ b/src/test/regress/sql/plpgsql.sql @@ -4503,6 +4503,32 @@ ALTER TABLE alter_table_under_transition_tables UPDATE alter_table_under_transition_tables SET id = id; +-- +-- Test multiple reference to a transition table +-- + +CREATE TABLE multi_test (i int); +INSERT INTO multi_test VALUES (1); + +CREATE OR REPLACE FUNCTION multi_test_trig() RETURNS trigger +LANGUAGE plpgsql AS $$ +BEGIN + RAISE NOTICE 'count = %', (SELECT COUNT(*) FROM new_test); + RAISE NOTICE 'count union = %', + (SELECT COUNT(*) + FROM (SELECT * FROM new_test UNION ALL SELECT * FROM new_test) ss); + RETURN NULL; +END$$; + +CREATE TRIGGER my_trigger AFTER UPDATE ON multi_test + REFERENCING NEW TABLE AS new_test OLD TABLE as old_test + FOR EACH STATEMENT EXECUTE PROCEDURE multi_test_trig(); + +UPDATE multi_test SET i = i; + +DROP TABLE multi_test; +DROP FUNCTION multi_test_trig(); + -- -- Check type parsing and record fetching from partitioned tables --