Update dblink extension for parallel query.

Almost all functions provided by this extension are PARALLEL
RESTRICTED.  Mostly, that's because the leader's TCP connections won't
be shared with the workers, but in some cases like dblink_get_pkey
it's because they obtain locks which might be released early if taken
within a parallel worker.  dblink_fdw_validator probably can't be used
in a query anyway, but there would be no problem from the point of
view of parallel query if it were, so it's PARALLEL SAFE.

Andreas Karlsson

contrib/dblink/Makefile

@@ -6,7 +6,8 @@ PG_CPPFLAGS = -I$(libpq_srcdir)
 SHLIB_LINK = $(libpq)
 
 EXTENSION = dblink
-DATA = dblink--1.1.sql dblink--1.0--1.1.sql dblink--unpackaged--1.0.sql
+DATA = dblink--1.2.sql dblink--1.1--1.2.sql dblink--1.0--1.1.sql \
+	dblink--unpackaged--1.0.sql
 PGFILEDESC = "dblink - connect to other PostgreSQL databases"
 
 REGRESS = paths dblink

contrib/dblink/dblink--1.1--1.2.sql

+/* contrib/dblink/dblink--1.1--1.2.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION dblink UPDATE TO '1.2'" to load this file. \quit
+
+ALTER FUNCTION dblink_connect(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_connect(text, text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_connect_u(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_connect_u(text, text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_disconnect() PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_disconnect(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_open(text, text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_open(text, text, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_open(text, text, text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_open(text, text, text, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_fetch(text, int) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_fetch(text, int, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_fetch(text, text, int) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_fetch(text, text, int, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_close(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_close(text, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_close(text, text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_close(text, text, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink(text, text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink(text, text, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink(text, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_exec(text, text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_exec(text, text, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_exec(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_exec(text, boolean) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_get_pkey(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_build_sql_insert(text, int2vector, int, _text, _text) PARALLEL SAFE;
+ALTER FUNCTION dblink_build_sql_delete(text, int2vector, int, _text) PARALLEL SAFE;
+ALTER FUNCTION dblink_build_sql_update(text, int2vector, int, _text, _text) PARALLEL SAFE;
+ALTER FUNCTION dblink_current_query() PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_send_query(text, text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_is_busy(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_get_result(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_get_result(text, bool) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_get_connections() PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_cancel_query(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_error_message(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_get_notify() PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_get_notify(text) PARALLEL RESTRICTED;
+ALTER FUNCTION dblink_fdw_validator(text[], oid) PARALLEL SAFE;

contrib/dblink/dblink--1.1.sql → contrib/dblink/dblink--1.2.sql

-/* contrib/dblink/dblink--1.1.sql */
+/* contrib/dblink/dblink--1.2.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION dblink" to load this file. \quit
@@ -8,12 +8,12 @@
 CREATE FUNCTION dblink_connect (text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_connect'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_connect (text, text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_connect'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 -- dblink_connect_u allows non-superusers to use
 -- non-password authenticated connections, but initially
@@ -21,12 +21,12 @@ LANGUAGE C STRICT;
 CREATE FUNCTION dblink_connect_u (text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_connect'
-LANGUAGE C STRICT SECURITY DEFINER;
+LANGUAGE C STRICT PARALLEL RESTRICTED SECURITY DEFINER;
 
 CREATE FUNCTION dblink_connect_u (text, text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_connect'
-LANGUAGE C STRICT SECURITY DEFINER;
+LANGUAGE C STRICT PARALLEL RESTRICTED SECURITY DEFINER;
 
 REVOKE ALL ON FUNCTION dblink_connect_u (text) FROM public;
 REVOKE ALL ON FUNCTION dblink_connect_u (text, text) FROM public;
@@ -34,174 +34,174 @@ REVOKE ALL ON FUNCTION dblink_connect_u (text, text) FROM public;
 CREATE FUNCTION dblink_disconnect ()
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_disconnect'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_disconnect (text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_disconnect'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_open (text, text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_open'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_open (text, text, boolean)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_open'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_open (text, text, text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_open'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_open (text, text, text, boolean)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_open'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_fetch (text, int)
 RETURNS setof record
 AS 'MODULE_PATHNAME','dblink_fetch'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_fetch (text, int, boolean)
 RETURNS setof record
 AS 'MODULE_PATHNAME','dblink_fetch'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_fetch (text, text, int)
 RETURNS setof record
 AS 'MODULE_PATHNAME','dblink_fetch'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_fetch (text, text, int, boolean)
 RETURNS setof record
 AS 'MODULE_PATHNAME','dblink_fetch'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_close (text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_close'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_close (text, boolean)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_close'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_close (text, text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_close'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_close (text, text, boolean)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_close'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink (text, text)
 RETURNS setof record
 AS 'MODULE_PATHNAME','dblink_record'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink (text, text, boolean)
 RETURNS setof record
 AS 'MODULE_PATHNAME','dblink_record'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink (text)
 RETURNS setof record
 AS 'MODULE_PATHNAME','dblink_record'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink (text, boolean)
 RETURNS setof record
 AS 'MODULE_PATHNAME','dblink_record'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_exec (text, text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_exec'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_exec (text, text, boolean)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_exec'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_exec (text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_exec'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_exec (text,boolean)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_exec'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE TYPE dblink_pkey_results AS (position int, colname text);
 
 CREATE FUNCTION dblink_get_pkey (text)
 RETURNS setof dblink_pkey_results
 AS 'MODULE_PATHNAME','dblink_get_pkey'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_build_sql_insert (text, int2vector, int, _text, _text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_build_sql_insert'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 CREATE FUNCTION dblink_build_sql_delete (text, int2vector, int, _text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_build_sql_delete'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 CREATE FUNCTION dblink_build_sql_update (text, int2vector, int, _text, _text)
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_build_sql_update'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 CREATE FUNCTION dblink_current_query ()
 RETURNS text
 AS 'MODULE_PATHNAME','dblink_current_query'
-LANGUAGE C;
+LANGUAGE C PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_send_query(text, text)
 RETURNS int4
 AS 'MODULE_PATHNAME', 'dblink_send_query'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_is_busy(text)
 RETURNS int4
 AS 'MODULE_PATHNAME', 'dblink_is_busy'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_get_result(text)
 RETURNS SETOF record
 AS 'MODULE_PATHNAME', 'dblink_get_result'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_get_result(text, bool)
 RETURNS SETOF record
 AS 'MODULE_PATHNAME', 'dblink_get_result'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_get_connections()
 RETURNS text[]
 AS 'MODULE_PATHNAME', 'dblink_get_connections'
-LANGUAGE C;
+LANGUAGE C PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_cancel_query(text)
 RETURNS text
 AS 'MODULE_PATHNAME', 'dblink_cancel_query'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_error_message(text)
 RETURNS text
 AS 'MODULE_PATHNAME', 'dblink_error_message'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_get_notify(
     OUT notify_name TEXT,
@@ -210,7 +210,7 @@ CREATE FUNCTION dblink_get_notify(
 )
 RETURNS setof record
 AS 'MODULE_PATHNAME', 'dblink_get_notify'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 CREATE FUNCTION dblink_get_notify(
     conname TEXT,
@@ -220,7 +220,7 @@ CREATE FUNCTION dblink_get_notify(
 )
 RETURNS setof record
 AS 'MODULE_PATHNAME', 'dblink_get_notify'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL RESTRICTED;
 
 /* New stuff in 1.1 begins here */
 
@@ -230,6 +230,6 @@ CREATE FUNCTION dblink_fdw_validator(
 )
 RETURNS void
 AS 'MODULE_PATHNAME', 'dblink_fdw_validator'
-LANGUAGE C STRICT;
+LANGUAGE C STRICT PARALLEL SAFE;
 
 CREATE FOREIGN DATA WRAPPER dblink_fdw VALIDATOR dblink_fdw_validator;

contrib/dblink/dblink.control

 # dblink extension
 comment = 'connect to other PostgreSQL databases from within a database'
-default_version = '1.1'
+default_version = '1.2'
 module_pathname = '$libdir/dblink'
 relocatable = true