Adding upstream version 13.4.upstream/13.4upstream

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

2 files changed, 604 insertions, 0 deletions

diff --git a/contrib/dblink/sql/.gitignore b/contrib/dblink/sql/.gitignore
new file mode 100644
index 0000000..d175078
--- /dev/null
+++ b/contrib/dblink/sql/.gitignore
@@ -0,0 +1 @@
+/paths.sql
diff --git a/contrib/dblink/sql/dblink.sql b/contrib/dblink/sql/dblink.sql
new file mode 100644
index 0000000..3e96b98
--- /dev/null
+++ b/contrib/dblink/sql/dblink.sql
@@ -0,0 +1,603 @@
+CREATE EXTENSION dblink;
+
+-- want context for notices
+\set SHOW_CONTEXT always
+
+CREATE TABLE foo(f1 int, f2 text, f3 text[], primary key (f1,f2));
+INSERT INTO foo VALUES (0,'a','{"a0","b0","c0"}');
+INSERT INTO foo VALUES (1,'b','{"a1","b1","c1"}');
+INSERT INTO foo VALUES (2,'c','{"a2","b2","c2"}');
+INSERT INTO foo VALUES (3,'d','{"a3","b3","c3"}');
+INSERT INTO foo VALUES (4,'e','{"a4","b4","c4"}');
+INSERT INTO foo VALUES (5,'f','{"a5","b5","c5"}');
+INSERT INTO foo VALUES (6,'g','{"a6","b6","c6"}');
+INSERT INTO foo VALUES (7,'h','{"a7","b7","c7"}');
+INSERT INTO foo VALUES (8,'i','{"a8","b8","c8"}');
+INSERT INTO foo VALUES (9,'j','{"a9","b9","c9"}');
+
+-- misc utilities
+
+-- list the primary key fields
+SELECT *
+FROM dblink_get_pkey('foo');
+
+-- build an insert statement based on a local tuple,
+-- replacing the primary key values with new ones
+SELECT dblink_build_sql_insert('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_insert('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
+
+-- build an update statement based on a local tuple,
+-- replacing the primary key values with new ones
+SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_update('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
+
+-- build a delete statement based on a local tuple,
+SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_delete('foo','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}');
+
+-- repeat the test for table with primary key index with included columns
+CREATE TABLE foo_1(f1 int, f2 text, f3 text[], primary key (f1,f2) include (f3));
+INSERT INTO foo_1 VALUES (0,'a','{"a0","b0","c0"}');
+INSERT INTO foo_1 VALUES (1,'b','{"a1","b1","c1"}');
+INSERT INTO foo_1 VALUES (2,'c','{"a2","b2","c2"}');
+INSERT INTO foo_1 VALUES (3,'d','{"a3","b3","c3"}');
+INSERT INTO foo_1 VALUES (4,'e','{"a4","b4","c4"}');
+INSERT INTO foo_1 VALUES (5,'f','{"a5","b5","c5"}');
+INSERT INTO foo_1 VALUES (6,'g','{"a6","b6","c6"}');
+INSERT INTO foo_1 VALUES (7,'h','{"a7","b7","c7"}');
+INSERT INTO foo_1 VALUES (8,'i','{"a8","b8","c8"}');
+INSERT INTO foo_1 VALUES (9,'j','{"a9","b9","c9"}');
+
+-- misc utilities
+
+-- list the primary key fields
+SELECT *
+FROM dblink_get_pkey('foo_1');
+
+-- build an insert statement based on a local tuple,
+-- replacing the primary key values with new ones
+SELECT dblink_build_sql_insert('foo_1','1 2',2,'{"0", "a"}','{"99", "xyz"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_insert('foo_1','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
+
+-- build an update statement based on a local tuple,
+-- replacing the primary key values with new ones
+SELECT dblink_build_sql_update('foo_1','1 2',2,'{"0", "a"}','{"99", "xyz"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_update('foo_1','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}','{"99", "xyz", "{za0,zb0,zc0}"}');
+
+-- build a delete statement based on a local tuple,
+SELECT dblink_build_sql_delete('foo_1','1 2',2,'{"0", "a"}');
+-- too many pk fields, should fail
+SELECT dblink_build_sql_delete('foo_1','1 2 3 4',4,'{"0", "a", "{a0,b0,c0}"}');
+
+DROP TABLE foo_1;
+
+-- retest using a quoted and schema qualified table
+CREATE SCHEMA "MySchema";
+CREATE TABLE "MySchema"."Foo"(f1 int, f2 text, f3 text[], primary key (f1,f2));
+INSERT INTO "MySchema"."Foo" VALUES (0,'a','{"a0","b0","c0"}');
+
+-- list the primary key fields
+SELECT *
+FROM dblink_get_pkey('"MySchema"."Foo"');
+
+-- build an insert statement based on a local tuple,
+-- replacing the primary key values with new ones
+SELECT dblink_build_sql_insert('"MySchema"."Foo"','1 2',2,'{"0", "a"}','{"99", "xyz"}');
+
+-- build an update statement based on a local tuple,
+-- replacing the primary key values with new ones
+SELECT dblink_build_sql_update('"MySchema"."Foo"','1 2',2,'{"0", "a"}','{"99", "xyz"}');
+
+-- build a delete statement based on a local tuple,
+SELECT dblink_build_sql_delete('"MySchema"."Foo"','1 2',2,'{"0", "a"}');
+
+CREATE FUNCTION connection_parameters() RETURNS text LANGUAGE SQL AS $f$
+       SELECT $$dbname='$$||current_database()||$$' port=$$||current_setting('port');
+$f$;
+
+-- regular old dblink
+SELECT *
+FROM dblink(connection_parameters(),'SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- should generate "connection not available" error
+SELECT *
+FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- The first-level connection's backend will crash on exit given OpenLDAP
+-- [2.4.24, 2.4.31].  We won't see evidence of any crash until the victim
+-- process terminates and the postmaster responds.  If process termination
+-- entails writing a core dump, that can take awhile.  Wait for the process to
+-- vanish.  At that point, the postmaster has called waitpid() on the crashed
+-- process, and it will accept no new connections until it has reinitialized
+-- the cluster.  (We can't exploit pg_stat_activity, because the crash happens
+-- after the backend updates shared memory to reflect its impending exit.)
+DO $pl$
+DECLARE
+	detail text;
+BEGIN
+	PERFORM wait_pid(crash_pid)
+	FROM dblink(connection_parameters(), $$
+		SELECT pg_backend_pid() FROM dblink(
+			'service=test_ldap '||connection_parameters(),
+			-- This string concatenation is a hack to shoehorn a
+			-- set_pgservicefile call into the SQL statement.
+			'SELECT 1' || set_pgservicefile('pg_service.conf')
+		) t(c int)
+	$$) AS t(crash_pid int);
+EXCEPTION WHEN OTHERS THEN
+	GET STACKED DIAGNOSTICS detail = PG_EXCEPTION_DETAIL;
+	-- Expected error in a non-LDAP build.
+	IF NOT detail LIKE 'syntax error in service file%' THEN RAISE; END IF;
+END
+$pl$;
+
+-- create a persistent connection
+SELECT dblink_connect(connection_parameters());
+
+-- use the persistent connection
+SELECT *
+FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- open a cursor with bad SQL and fail_on_error set to false
+SELECT dblink_open('rmt_foo_cursor','SELECT * FROM foobar',false);
+
+-- reset remote transaction state
+SELECT dblink_exec('ABORT');
+
+-- open a cursor
+SELECT dblink_open('rmt_foo_cursor','SELECT * FROM foo');
+
+-- close the cursor
+SELECT dblink_close('rmt_foo_cursor',false);
+
+-- open the cursor again
+SELECT dblink_open('rmt_foo_cursor','SELECT * FROM foo');
+
+-- fetch some data
+SELECT *
+FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
+
+SELECT *
+FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
+
+-- this one only finds two rows left
+SELECT *
+FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
+
+-- intentionally botch a fetch
+SELECT *
+FROM dblink_fetch('rmt_foobar_cursor',4,false) AS t(a int, b text, c text[]);
+
+-- reset remote transaction state
+SELECT dblink_exec('ABORT');
+
+-- close the wrong cursor
+SELECT dblink_close('rmt_foobar_cursor',false);
+
+-- should generate 'cursor "rmt_foo_cursor" not found' error
+SELECT *
+FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
+
+-- this time, 'cursor "rmt_foo_cursor" not found' as a notice
+SELECT *
+FROM dblink_fetch('rmt_foo_cursor',4,false) AS t(a int, b text, c text[]);
+
+-- close the persistent connection
+SELECT dblink_disconnect();
+
+-- should generate "connection not available" error
+SELECT *
+FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- put more data into our table, first using arbitrary connection syntax
+-- but truncate the actual return value so we can use diff to check for success
+SELECT substr(dblink_exec(connection_parameters(),'INSERT INTO foo VALUES(10,''k'',''{"a10","b10","c10"}'')'),1,6);
+
+-- create a persistent connection
+SELECT dblink_connect(connection_parameters());
+
+-- put more data into our table, using persistent connection syntax
+-- but truncate the actual return value so we can use diff to check for success
+SELECT substr(dblink_exec('INSERT INTO foo VALUES(11,''l'',''{"a11","b11","c11"}'')'),1,6);
+
+-- let's see it
+SELECT *
+FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[]);
+
+-- bad remote select
+SELECT *
+FROM dblink('SELECT * FROM foobar',false) AS t(a int, b text, c text[]);
+
+-- change some data
+SELECT dblink_exec('UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
+
+-- let's see it
+SELECT *
+FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE a = 11;
+
+-- botch a change to some other data
+SELECT dblink_exec('UPDATE foobar SET f3[2] = ''b99'' WHERE f1 = 11',false);
+
+-- delete some data
+SELECT dblink_exec('DELETE FROM foo WHERE f1 = 11');
+
+-- let's see it
+SELECT *
+FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE a = 11;
+
+-- close the persistent connection
+SELECT dblink_disconnect();
+
+--
+-- tests for the new named persistent connection syntax
+--
+
+-- should generate "missing "=" after "myconn" in connection info string" error
+SELECT *
+FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- create a named persistent connection
+SELECT dblink_connect('myconn',connection_parameters());
+
+-- use the named persistent connection
+SELECT *
+FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- use the named persistent connection, but get it wrong
+SELECT *
+FROM dblink('myconn','SELECT * FROM foobar',false) AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- create a second named persistent connection
+-- should error with "duplicate connection name"
+SELECT dblink_connect('myconn',connection_parameters());
+
+-- create a second named persistent connection with a new name
+SELECT dblink_connect('myconn2',connection_parameters());
+
+-- use the second named persistent connection
+SELECT *
+FROM dblink('myconn2','SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- close the second named persistent connection
+SELECT dblink_disconnect('myconn2');
+
+-- open a cursor incorrectly
+SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foobar',false);
+
+-- reset remote transaction state
+SELECT dblink_exec('myconn','ABORT');
+
+-- test opening cursor in a transaction
+SELECT dblink_exec('myconn','BEGIN');
+
+-- an open transaction will prevent dblink_open() from opening its own
+SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
+
+-- this should not commit the transaction because the client opened it
+SELECT dblink_close('myconn','rmt_foo_cursor');
+
+-- this should succeed because we have an open transaction
+SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
+
+-- commit remote transaction
+SELECT dblink_exec('myconn','COMMIT');
+
+-- test automatic transactions for multiple cursor opens
+SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
+
+-- the second cursor
+SELECT dblink_open('myconn','rmt_foo_cursor2','SELECT * FROM foo');
+
+-- this should not commit the transaction
+SELECT dblink_close('myconn','rmt_foo_cursor2');
+
+-- this should succeed because we have an open transaction
+SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
+
+-- this should commit the transaction
+SELECT dblink_close('myconn','rmt_foo_cursor');
+
+-- this should fail because there is no open transaction
+SELECT dblink_exec('myconn','DECLARE xact_test CURSOR FOR SELECT * FROM foo');
+
+-- reset remote transaction state
+SELECT dblink_exec('myconn','ABORT');
+
+-- open a cursor
+SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
+
+-- fetch some data
+SELECT *
+FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
+
+SELECT *
+FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
+
+-- this one only finds three rows left
+SELECT *
+FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
+
+-- fetch some data incorrectly
+SELECT *
+FROM dblink_fetch('myconn','rmt_foobar_cursor',4,false) AS t(a int, b text, c text[]);
+
+-- reset remote transaction state
+SELECT dblink_exec('myconn','ABORT');
+
+-- should generate 'cursor "rmt_foo_cursor" not found' error
+SELECT *
+FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
+
+-- close the named persistent connection
+SELECT dblink_disconnect('myconn');
+
+-- should generate "missing "=" after "myconn" in connection info string" error
+SELECT *
+FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE t.a > 7;
+
+-- create a named persistent connection
+SELECT dblink_connect('myconn',connection_parameters());
+
+-- put more data into our table, using named persistent connection syntax
+-- but truncate the actual return value so we can use diff to check for success
+SELECT substr(dblink_exec('myconn','INSERT INTO foo VALUES(11,''l'',''{"a11","b11","c11"}'')'),1,6);
+
+-- let's see it
+SELECT *
+FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[]);
+
+-- change some data
+SELECT dblink_exec('myconn','UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
+
+-- let's see it
+SELECT *
+FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE a = 11;
+
+-- delete some data
+SELECT dblink_exec('myconn','DELETE FROM foo WHERE f1 = 11');
+
+-- let's see it
+SELECT *
+FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
+WHERE a = 11;
+
+-- close the named persistent connection
+SELECT dblink_disconnect('myconn');
+
+-- close the named persistent connection again
+-- should get 'connection "myconn" not available' error
+SELECT dblink_disconnect('myconn');
+
+-- test asynchronous queries
+SELECT dblink_connect('dtest1', connection_parameters());
+SELECT * from
+ dblink_send_query('dtest1', 'select * from foo where f1 < 3') as t1;
+
+SELECT dblink_connect('dtest2', connection_parameters());
+SELECT * from
+ dblink_send_query('dtest2', 'select * from foo where f1 > 2 and f1 < 7') as t1;
+
+SELECT dblink_connect('dtest3', connection_parameters());
+SELECT * from
+ dblink_send_query('dtest3', 'select * from foo where f1 > 6') as t1;
+
+CREATE TEMPORARY TABLE result AS
+(SELECT * from dblink_get_result('dtest1') as t1(f1 int, f2 text, f3 text[]))
+UNION
+(SELECT * from dblink_get_result('dtest2') as t2(f1 int, f2 text, f3 text[]))
+UNION
+(SELECT * from dblink_get_result('dtest3') as t3(f1 int, f2 text, f3 text[]))
+ORDER by f1;
+
+-- dblink_get_connections returns an array with elements in a machine-dependent
+-- ordering, so we must resort to unnesting and sorting for a stable result
+create function unnest(anyarray) returns setof anyelement
+language sql strict immutable as $$
+select $1[i] from generate_series(array_lower($1,1), array_upper($1,1)) as i
+$$;
+
+SELECT * FROM unnest(dblink_get_connections()) ORDER BY 1;
+
+SELECT dblink_is_busy('dtest1');
+
+SELECT dblink_disconnect('dtest1');
+SELECT dblink_disconnect('dtest2');
+SELECT dblink_disconnect('dtest3');
+
+SELECT * from result;
+
+SELECT dblink_connect('dtest1', connection_parameters());
+SELECT * from
+ dblink_send_query('dtest1', 'select * from foo where f1 < 3') as t1;
+
+SELECT dblink_cancel_query('dtest1');
+SELECT dblink_error_message('dtest1');
+SELECT dblink_disconnect('dtest1');
+
+-- test foreign data wrapper functionality
+CREATE ROLE regress_dblink_user;
+DO $d$
+    BEGIN
+        EXECUTE $$CREATE SERVER fdtest FOREIGN DATA WRAPPER dblink_fdw
+            OPTIONS (dbname '$$||current_database()||$$',
+                     port '$$||current_setting('port')||$$'
+            )$$;
+    END;
+$d$;
+
+CREATE USER MAPPING FOR public SERVER fdtest
+  OPTIONS (server 'localhost');  -- fail, can't specify server here
+CREATE USER MAPPING FOR public SERVER fdtest OPTIONS (user :'USER');
+
+GRANT USAGE ON FOREIGN SERVER fdtest TO regress_dblink_user;
+GRANT EXECUTE ON FUNCTION dblink_connect_u(text, text) TO regress_dblink_user;
+
+SET SESSION AUTHORIZATION regress_dblink_user;
+-- should fail
+SELECT dblink_connect('myconn', 'fdtest');
+-- should succeed
+SELECT dblink_connect_u('myconn', 'fdtest');
+SELECT * FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[]);
+
+\c - -
+REVOKE USAGE ON FOREIGN SERVER fdtest FROM regress_dblink_user;
+REVOKE EXECUTE ON FUNCTION dblink_connect_u(text, text) FROM regress_dblink_user;
+DROP USER regress_dblink_user;
+DROP USER MAPPING FOR public SERVER fdtest;
+DROP SERVER fdtest;
+
+-- test asynchronous notifications
+SELECT dblink_connect(connection_parameters());
+
+--should return listen
+SELECT dblink_exec('LISTEN regression');
+--should return listen
+SELECT dblink_exec('LISTEN foobar');
+
+SELECT dblink_exec('NOTIFY regression');
+SELECT dblink_exec('NOTIFY foobar');
+
+SELECT notify_name, be_pid = (select t.be_pid from dblink('select pg_backend_pid()') as t(be_pid int)) AS is_self_notify, extra from dblink_get_notify();
+
+SELECT * from dblink_get_notify();
+
+SELECT dblink_disconnect();
+
+-- test dropped columns in dblink_build_sql_insert, dblink_build_sql_update
+CREATE TEMP TABLE test_dropped
+(
+	col1 INT NOT NULL DEFAULT 111,
+	id SERIAL PRIMARY KEY,
+	col2 INT NOT NULL DEFAULT 112,
+	col2b INT NOT NULL DEFAULT 113
+);
+
+INSERT INTO test_dropped VALUES(default);
+
+ALTER TABLE test_dropped
+	DROP COLUMN col1,
+	DROP COLUMN col2,
+	ADD COLUMN col3 VARCHAR(10) NOT NULL DEFAULT 'foo',
+	ADD COLUMN col4 INT NOT NULL DEFAULT 42;
+
+SELECT dblink_build_sql_insert('test_dropped', '1', 1,
+                               ARRAY['1'::TEXT], ARRAY['2'::TEXT]);
+
+SELECT dblink_build_sql_update('test_dropped', '1', 1,
+                               ARRAY['1'::TEXT], ARRAY['2'::TEXT]);
+
+SELECT dblink_build_sql_delete('test_dropped', '1', 1,
+                               ARRAY['2'::TEXT]);
+
+-- test local mimicry of remote GUC values that affect datatype I/O
+SET datestyle = ISO, MDY;
+SET intervalstyle = postgres;
+SET timezone = UTC;
+SELECT dblink_connect('myconn',connection_parameters());
+SELECT dblink_exec('myconn', 'SET datestyle = GERMAN, DMY;');
+
+-- single row synchronous case
+SELECT *
+FROM dblink('myconn',
+    'SELECT * FROM (VALUES (''12.03.2013 00:00:00+00'')) t')
+  AS t(a timestamptz);
+
+-- multi-row synchronous case
+SELECT *
+FROM dblink('myconn',
+    'SELECT * FROM
+     (VALUES (''12.03.2013 00:00:00+00''),
+             (''12.03.2013 00:00:00+00'')) t')
+  AS t(a timestamptz);
+
+-- single-row asynchronous case
+SELECT *
+FROM dblink_send_query('myconn',
+    'SELECT * FROM
+     (VALUES (''12.03.2013 00:00:00+00'')) t');
+CREATE TEMPORARY TABLE result AS
+(SELECT * from dblink_get_result('myconn') as t(t timestamptz))
+UNION ALL
+(SELECT * from dblink_get_result('myconn') as t(t timestamptz));
+SELECT * FROM result;
+DROP TABLE result;
+
+-- multi-row asynchronous case
+SELECT *
+FROM dblink_send_query('myconn',
+    'SELECT * FROM
+     (VALUES (''12.03.2013 00:00:00+00''),
+             (''12.03.2013 00:00:00+00'')) t');
+CREATE TEMPORARY TABLE result AS
+(SELECT * from dblink_get_result('myconn') as t(t timestamptz))
+UNION ALL
+(SELECT * from dblink_get_result('myconn') as t(t timestamptz))
+UNION ALL
+(SELECT * from dblink_get_result('myconn') as t(t timestamptz));
+SELECT * FROM result;
+DROP TABLE result;
+
+-- Try an ambiguous interval
+SELECT dblink_exec('myconn', 'SET intervalstyle = sql_standard;');
+SELECT *
+FROM dblink('myconn',
+    'SELECT * FROM (VALUES (''-1 2:03:04'')) i')
+  AS i(i interval);
+
+-- Try swapping to another format to ensure the GUCs are tracked
+-- properly through a change.
+CREATE TEMPORARY TABLE result (t timestamptz);
+
+SELECT dblink_exec('myconn', 'SET datestyle = ISO, MDY;');
+INSERT INTO result
+  SELECT *
+  FROM dblink('myconn',
+              'SELECT * FROM (VALUES (''03.12.2013 00:00:00+00'')) t')
+    AS t(a timestamptz);
+
+SELECT dblink_exec('myconn', 'SET datestyle = GERMAN, DMY;');
+INSERT INTO result
+  SELECT *
+  FROM dblink('myconn',
+              'SELECT * FROM (VALUES (''12.03.2013 00:00:00+00'')) t')
+    AS t(a timestamptz);
+
+SELECT * FROM result;
+
+DROP TABLE result;
+
+-- Check error throwing in dblink_fetch
+SELECT dblink_open('myconn','error_cursor',
+       'SELECT * FROM (VALUES (''1''), (''not an int'')) AS t(text);');
+SELECT *
+FROM dblink_fetch('myconn','error_cursor', 1) AS t(i int);
+SELECT *
+FROM dblink_fetch('myconn','error_cursor', 1) AS t(i int);
+
+-- Make sure that the local settings have retained their values in spite
+-- of shenanigans on the connection.
+SHOW datestyle;
+SHOW intervalstyle;
+
+-- Clean up GUC-setting tests
+SELECT dblink_disconnect('myconn');
+RESET datestyle;
+RESET intervalstyle;
+RESET timezone;