pg_dump: Dump operators with the same name ordered by arity

pg_dump sorts operators by name, but operators with the same name come
out in random order.  Now operators with the same name are dumped in
the order prefix, postfix, infix.  (This is consistent with functions,
which are dumped in increasing number of argument order.)

src/bin/pg_dump/pg_dump.c

@@ -3138,6 +3138,7 @@ getOperators(int *numOprs)
 	int			i_oprname;
 	int			i_oprnamespace;
 	int			i_rolname;
+	int			i_oprkind;
 	int			i_oprcode;
 
 	/*
@@ -3153,6 +3154,7 @@ getOperators(int *numOprs)
 		appendPQExpBuffer(query, "SELECT tableoid, oid, oprname, "
 						  "oprnamespace, "
 						  "(%s oprowner) AS rolname, "
+						  "oprkind, "
 						  "oprcode::oid AS oprcode "
 						  "FROM pg_operator",
 						  username_subquery);
@@ -3162,6 +3164,7 @@ getOperators(int *numOprs)
 		appendPQExpBuffer(query, "SELECT tableoid, oid, oprname, "
 						  "0::oid AS oprnamespace, "
 						  "(%s oprowner) AS rolname, "
+						  "oprkind, "
 						  "oprcode::oid AS oprcode "
 						  "FROM pg_operator",
 						  username_subquery);
@@ -3173,6 +3176,7 @@ getOperators(int *numOprs)
 						  "oid, oprname, "
 						  "0::oid AS oprnamespace, "
 						  "(%s oprowner) AS rolname, "
+						  "oprkind, "
 						  "oprcode::oid AS oprcode "
 						  "FROM pg_operator",
 						  username_subquery);
@@ -3191,6 +3195,7 @@ getOperators(int *numOprs)
 	i_oprname = PQfnumber(res, "oprname");
 	i_oprnamespace = PQfnumber(res, "oprnamespace");
 	i_rolname = PQfnumber(res, "rolname");
+	i_oprkind = PQfnumber(res, "oprkind");
 	i_oprcode = PQfnumber(res, "oprcode");
 
 	for (i = 0; i < ntups; i++)
@@ -3203,6 +3208,7 @@ getOperators(int *numOprs)
 		oprinfo[i].dobj.namespace = findNamespace(atooid(PQgetvalue(res, i, i_oprnamespace)),
 												  oprinfo[i].dobj.catId.oid);
 		oprinfo[i].rolname = pg_strdup(PQgetvalue(res, i, i_rolname));
+		oprinfo[i].oprkind = (PQgetvalue(res, i, i_oprkind))[0];
 		oprinfo[i].oprcode = atooid(PQgetvalue(res, i, i_oprcode));
 
 		/* Decide whether we want to dump it */

src/bin/pg_dump/pg_dump.h

@@ -204,6 +204,7 @@ typedef struct _oprInfo
 {
 	DumpableObject dobj;
 	char	   *rolname;
+	char		oprkind;
 	Oid			oprcode;
 } OprInfo;
 

src/bin/pg_dump/pg_dump_sort.c

@@ -178,6 +178,16 @@ DOTypeNameCompare(const void *p1, const void *p2)
 		if (cmpval != 0)
 			return cmpval;
 	}
+	else if (obj1->objType == DO_OPERATOR)
+	{
+		OprInfo	*oobj1 = *(OprInfo * const *) p1;
+		OprInfo *oobj2 = *(OprInfo * const *) p2;
+
+		/* oprkind is 'l', 'r', or 'b'; this sorts prefix, postfix, infix */
+		cmpval = (oobj2->oprkind - oobj1->oprkind);
+		if (cmpval != 0)
+			return cmpval;
+	}
 
 	/* Usually shouldn't get here, but if we do, sort by OID */
 	return oidcmp(obj1->catId.oid, obj2->catId.oid);