Convert oidvector and int2vector into variable-length arrays. This

change saves a great deal of space in pg_proc and its primary index,
and it eliminates the former requirement that INDEX_MAX_KEYS and
FUNC_MAX_ARGS have the same value.  INDEX_MAX_KEYS is still embedded
in the on-disk representation (because it affects index tuple header
size), but FUNC_MAX_ARGS is not.  I believe it would now be possible
to increase FUNC_MAX_ARGS at little cost, but haven't experimented yet.
There are still a lot of vestigial references to FUNC_MAX_ARGS, which
I will clean up in a separate pass.  However, getting rid of it
altogether would require changing the FunctionCallInfoData struct,
and I'm not sure I want to buy into that.

src/test/regress/expected/opr_sanity.out

@@ -33,23 +33,13 @@ create function physically_coercible(oid, oid) returns bool as
 language sql;
 -- **************** pg_proc ****************
 -- Look for illegal values in pg_proc fields.
--- NOTE: in reality pronargs could be more than 10, but I'm too lazy to put
--- a larger number of proargtypes check clauses in here.  If we ever have
--- more-than-10-arg functions in the standard catalogs, extend this query.
 SELECT p1.oid, p1.proname
 FROM pg_proc as p1
 WHERE p1.prolang = 0 OR p1.prorettype = 0 OR
-       p1.pronargs < 0 OR p1.pronargs > 10 OR
-       (p1.proargtypes[0] = 0 AND p1.pronargs > 0) OR
-       (p1.proargtypes[1] = 0 AND p1.pronargs > 1) OR
-       (p1.proargtypes[2] = 0 AND p1.pronargs > 2) OR
-       (p1.proargtypes[3] = 0 AND p1.pronargs > 3) OR
-       (p1.proargtypes[4] = 0 AND p1.pronargs > 4) OR
-       (p1.proargtypes[5] = 0 AND p1.pronargs > 5) OR
-       (p1.proargtypes[6] = 0 AND p1.pronargs > 6) OR
-       (p1.proargtypes[7] = 0 AND p1.pronargs > 7) OR
-       (p1.proargtypes[8] = 0 AND p1.pronargs > 8) OR
-       (p1.proargtypes[9] = 0 AND p1.pronargs > 9);
+       p1.pronargs < 0 OR
+       array_lower(p1.proargtypes, 1) != 0 OR
+       array_upper(p1.proargtypes, 1) != p1.pronargs-1 OR
+       0::oid = ANY (p1.proargtypes);
  oid | proname 
 -----+---------
 (0 rows)
@@ -218,7 +208,7 @@ WHERE p1.oid != p2.oid AND
 SELECT p1.oid, p1.proname
 FROM pg_proc as p1
 WHERE p1.prorettype = 'internal'::regtype AND NOT
-    ('(' || oidvectortypes(p1.proargtypes) || ')') ~ '[^a-z0-9_]internal[^a-z0-9_]';
+    'internal'::regtype = ANY (p1.proargtypes);
  oid  |   proname   
 ------+-------------
  2304 | internal_in

src/test/regress/expected/type_sanity.out

@@ -106,14 +106,18 @@ ORDER BY 1;
 (1 row)
 
 -- Varlena array types will point to array_in
+-- Exception as of 8.1: int2vector and oidvector have their own I/O routines
 SELECT p1.oid, p1.typname, p2.oid, p2.proname
 FROM pg_type AS p1, pg_proc AS p2
 WHERE p1.typinput = p2.oid AND p1.typtype in ('b', 'p') AND
     (p1.typelem != 0 AND p1.typlen < 0) AND NOT
-    (p2.oid = 'array_in'::regproc);
- oid | typname | oid | proname 
------+---------+-----+---------
-(0 rows)
+    (p2.oid = 'array_in'::regproc)
+ORDER BY 1;
+ oid |  typname   | oid |   proname    
+-----+------------+-----+--------------
+  22 | int2vector |  40 | int2vectorin
+  30 | oidvector  |  54 | oidvectorin
+(2 rows)
 
 -- Check for bogus typoutput routines
 -- As of 8.0, this check finds refcursor, which is borrowing
@@ -165,14 +169,18 @@ ORDER BY 1;
 (1 row)
 
 -- Varlena array types will point to array_recv
+-- Exception as of 8.1: int2vector and oidvector have their own I/O routines
 SELECT p1.oid, p1.typname, p2.oid, p2.proname
 FROM pg_type AS p1, pg_proc AS p2
 WHERE p1.typreceive = p2.oid AND p1.typtype in ('b', 'p') AND
     (p1.typelem != 0 AND p1.typlen < 0) AND NOT
-    (p2.oid = 'array_recv'::regproc);
- oid | typname | oid | proname 
------+---------+-----+---------
-(0 rows)
+    (p2.oid = 'array_recv'::regproc)
+ORDER BY 1;
+ oid |  typname   | oid  |    proname     
+-----+------------+------+----------------
+  22 | int2vector | 2410 | int2vectorrecv
+  30 | oidvector  | 2420 | oidvectorrecv
+(2 rows)
 
 -- Check for bogus typsend routines
 -- As of 7.4, this check finds refcursor, which is borrowing
@@ -203,7 +211,7 @@ WHERE p1.typsend = p2.oid AND p1.typtype in ('b', 'p') AND NOT
 -- Look for illegal values in pg_class fields
 SELECT p1.oid, p1.relname
 FROM pg_class as p1
-WHERE p1.relkind NOT IN ('r', 'i', 's', 'S', 't', 'v');
+WHERE p1.relkind NOT IN ('r', 'i', 's', 'S', 'c', 't', 'v');
  oid | relname 
 -----+---------
 (0 rows)

src/test/regress/sql/opr_sanity.sql

@@ -39,24 +39,14 @@ language sql;
 -- **************** pg_proc ****************
 
 -- Look for illegal values in pg_proc fields.
--- NOTE: in reality pronargs could be more than 10, but I'm too lazy to put
--- a larger number of proargtypes check clauses in here.  If we ever have
--- more-than-10-arg functions in the standard catalogs, extend this query.
 
 SELECT p1.oid, p1.proname
 FROM pg_proc as p1
 WHERE p1.prolang = 0 OR p1.prorettype = 0 OR
-       p1.pronargs < 0 OR p1.pronargs > 10 OR
-       (p1.proargtypes[0] = 0 AND p1.pronargs > 0) OR
-       (p1.proargtypes[1] = 0 AND p1.pronargs > 1) OR
-       (p1.proargtypes[2] = 0 AND p1.pronargs > 2) OR
-       (p1.proargtypes[3] = 0 AND p1.pronargs > 3) OR
-       (p1.proargtypes[4] = 0 AND p1.pronargs > 4) OR
-       (p1.proargtypes[5] = 0 AND p1.pronargs > 5) OR
-       (p1.proargtypes[6] = 0 AND p1.pronargs > 6) OR
-       (p1.proargtypes[7] = 0 AND p1.pronargs > 7) OR
-       (p1.proargtypes[8] = 0 AND p1.pronargs > 8) OR
-       (p1.proargtypes[9] = 0 AND p1.pronargs > 9);
+       p1.pronargs < 0 OR
+       array_lower(p1.proargtypes, 1) != 0 OR
+       array_upper(p1.proargtypes, 1) != p1.pronargs-1 OR
+       0::oid = ANY (p1.proargtypes);
 
 -- Look for conflicting proc definitions (same names and input datatypes).
 -- (This test should be dead code now that we have the unique index
@@ -179,7 +169,7 @@ WHERE p1.oid != p2.oid AND
 SELECT p1.oid, p1.proname
 FROM pg_proc as p1
 WHERE p1.prorettype = 'internal'::regtype AND NOT
-    ('(' || oidvectortypes(p1.proargtypes) || ')') ~ '[^a-z0-9_]internal[^a-z0-9_]';
+    'internal'::regtype = ANY (p1.proargtypes);
 
 
 -- **************** pg_cast ****************

src/test/regress/sql/type_sanity.sql

@@ -88,11 +88,13 @@ WHERE p1.typinput = p2.oid AND p1.typtype in ('b', 'p') AND NOT
 ORDER BY 1;
 
 -- Varlena array types will point to array_in
+-- Exception as of 8.1: int2vector and oidvector have their own I/O routines
 SELECT p1.oid, p1.typname, p2.oid, p2.proname
 FROM pg_type AS p1, pg_proc AS p2
 WHERE p1.typinput = p2.oid AND p1.typtype in ('b', 'p') AND
     (p1.typelem != 0 AND p1.typlen < 0) AND NOT
-    (p2.oid = 'array_in'::regproc);
+    (p2.oid = 'array_in'::regproc)
+ORDER BY 1;
 
 -- Check for bogus typoutput routines
 
@@ -132,11 +134,13 @@ WHERE p1.typreceive = p2.oid AND p1.typtype in ('b', 'p') AND NOT
 ORDER BY 1;
 
 -- Varlena array types will point to array_recv
+-- Exception as of 8.1: int2vector and oidvector have their own I/O routines
 SELECT p1.oid, p1.typname, p2.oid, p2.proname
 FROM pg_type AS p1, pg_proc AS p2
 WHERE p1.typreceive = p2.oid AND p1.typtype in ('b', 'p') AND
     (p1.typelem != 0 AND p1.typlen < 0) AND NOT
-    (p2.oid = 'array_recv'::regproc);
+    (p2.oid = 'array_recv'::regproc)
+ORDER BY 1;
 
 -- Check for bogus typsend routines
 
@@ -163,7 +167,7 @@ WHERE p1.typsend = p2.oid AND p1.typtype in ('b', 'p') AND NOT
 
 SELECT p1.oid, p1.relname
 FROM pg_class as p1
-WHERE p1.relkind NOT IN ('r', 'i', 's', 'S', 't', 'v');
+WHERE p1.relkind NOT IN ('r', 'i', 's', 'S', 'c', 't', 'v');
 
 -- Indexes should have an access method, others not.