Update of contrib stuff from massimo.

contrib/miscutil/misc_utils.sql.in

@@ -0,0 +1,40 @@
+-- SQL code to define the new array iterator functions and operators
+
+-- min(x,y)
+--
+create function min(int4,int4) returns int4
+  as 'MODULE_PATHNAME'
+  language 'C';
+
+-- max(x,y)
+--
+create function max(int4,int4) returns int4
+  as 'MODULE_PATHNAME'
+  language 'C';
+
+-- Set the maximum number of tuples returned by a single query
+--
+create function query_limit(int4) returns int4
+  as 'MODULE_PATHNAME'
+  language 'C';
+
+-- Return the pid of the backend
+--
+create function backend_pid() returns int4
+  as 'MODULE_PATHNAME'
+  language 'C';
+
+-- Unlisten from a relation
+--
+create function unlisten(name) returns int4
+  as 'MODULE_PATHNAME'
+  language 'C';
+
+-- Unlisten from all relations for this backend
+--
+create function unlisten() returns int4
+  as 'delete from pg_listener where listenerpid = backend_pid();
+      select 0'
+  language 'sql';
+
+-- end of file