Adding upstream version 16.2.upstream/16.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 164 insertions, 0 deletions

diff --git a/src/test/regress/sql/prepared_xacts.sql b/src/test/regress/sql/prepared_xacts.sql
new file mode 100644
index 0000000..2f0bb55
--- /dev/null
+++ b/src/test/regress/sql/prepared_xacts.sql
@@ -0,0 +1,164 @@
+--
+-- PREPARED TRANSACTIONS (two-phase commit)
+--
+-- We can't readily test persistence of prepared xacts within the
+-- regression script framework, unfortunately.  Note that a crash
+-- isn't really needed ... stopping and starting the postmaster would
+-- be enough, but we can't even do that here.
+
+
+-- create a simple table that we'll use in the tests
+CREATE TABLE pxtest1 (foobar VARCHAR(10));
+
+INSERT INTO pxtest1 VALUES ('aaa');
+
+
+-- Test PREPARE TRANSACTION
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+UPDATE pxtest1 SET foobar = 'bbb' WHERE foobar = 'aaa';
+SELECT * FROM pxtest1;
+PREPARE TRANSACTION 'foo1';
+
+SELECT * FROM pxtest1;
+
+-- Test pg_prepared_xacts system view
+SELECT gid FROM pg_prepared_xacts;
+
+-- Test ROLLBACK PREPARED
+ROLLBACK PREPARED 'foo1';
+
+SELECT * FROM pxtest1;
+
+SELECT gid FROM pg_prepared_xacts;
+
+
+-- Test COMMIT PREPARED
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+INSERT INTO pxtest1 VALUES ('ddd');
+SELECT * FROM pxtest1;
+PREPARE TRANSACTION 'foo2';
+
+SELECT * FROM pxtest1;
+
+COMMIT PREPARED 'foo2';
+
+SELECT * FROM pxtest1;
+
+-- Test duplicate gids
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+UPDATE pxtest1 SET foobar = 'eee' WHERE foobar = 'ddd';
+SELECT * FROM pxtest1;
+PREPARE TRANSACTION 'foo3';
+
+SELECT gid FROM pg_prepared_xacts;
+
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+INSERT INTO pxtest1 VALUES ('fff');
+
+-- This should fail, because the gid foo3 is already in use
+PREPARE TRANSACTION 'foo3';
+
+SELECT * FROM pxtest1;
+
+ROLLBACK PREPARED 'foo3';
+
+SELECT * FROM pxtest1;
+
+-- Test serialization failure (SSI)
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+UPDATE pxtest1 SET foobar = 'eee' WHERE foobar = 'ddd';
+SELECT * FROM pxtest1;
+PREPARE TRANSACTION 'foo4';
+
+SELECT gid FROM pg_prepared_xacts;
+
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+SELECT * FROM pxtest1;
+
+-- This should fail, because the two transactions have a write-skew anomaly
+INSERT INTO pxtest1 VALUES ('fff');
+PREPARE TRANSACTION 'foo5';
+
+SELECT gid FROM pg_prepared_xacts;
+
+ROLLBACK PREPARED 'foo4';
+
+SELECT gid FROM pg_prepared_xacts;
+
+-- Clean up
+DROP TABLE pxtest1;
+
+-- Test detection of session-level and xact-level locks on same object
+BEGIN;
+SELECT pg_advisory_lock(1);
+SELECT pg_advisory_xact_lock_shared(1);
+PREPARE TRANSACTION 'foo6';  -- fails
+
+-- Test subtransactions
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+  CREATE TABLE pxtest2 (a int);
+  INSERT INTO pxtest2 VALUES (1);
+  SAVEPOINT a;
+    INSERT INTO pxtest2 VALUES (2);
+  ROLLBACK TO a;
+  SAVEPOINT b;
+  INSERT INTO pxtest2 VALUES (3);
+PREPARE TRANSACTION 'regress-one';
+
+CREATE TABLE pxtest3(fff int);
+
+-- Test shared invalidation
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+  DROP TABLE pxtest3;
+  CREATE TABLE pxtest4 (a int);
+  INSERT INTO pxtest4 VALUES (1);
+  INSERT INTO pxtest4 VALUES (2);
+  DECLARE foo CURSOR FOR SELECT * FROM pxtest4;
+  -- Fetch 1 tuple, keeping the cursor open
+  FETCH 1 FROM foo;
+PREPARE TRANSACTION 'regress-two';
+
+-- No such cursor
+FETCH 1 FROM foo;
+
+-- Table doesn't exist, the creation hasn't been committed yet
+SELECT * FROM pxtest2;
+
+-- There should be two prepared transactions
+SELECT gid FROM pg_prepared_xacts;
+
+-- pxtest3 should be locked because of the pending DROP
+begin;
+lock table pxtest3 in access share mode nowait;
+rollback;
+
+-- Disconnect, we will continue testing in a different backend
+\c -
+
+-- There should still be two prepared transactions
+SELECT gid FROM pg_prepared_xacts;
+
+-- pxtest3 should still be locked because of the pending DROP
+begin;
+lock table pxtest3 in access share mode nowait;
+rollback;
+
+-- Commit table creation
+COMMIT PREPARED 'regress-one';
+\d pxtest2
+SELECT * FROM pxtest2;
+
+-- There should be one prepared transaction
+SELECT gid FROM pg_prepared_xacts;
+
+-- Commit table drop
+COMMIT PREPARED 'regress-two';
+SELECT * FROM pxtest3;
+
+-- There should be no prepared transactions
+SELECT gid FROM pg_prepared_xacts;
+
+-- Clean up
+DROP TABLE pxtest2;
+DROP TABLE pxtest3;  -- will still be there if prepared xacts are disabled
+DROP TABLE pxtest4;