Handle contrib's GIN/GIST support function signature changes honestly.

In commits 9ff60273e3 and dbe2328959 I (tgl) fixed the
signatures of a bunch of contrib's GIN and GIST support functions so that
they would pass validation by the recently-added amvalidate functions.
The backend does not actually consult or check those signatures otherwise,
so I figured this was basically cosmetic and did not require an extension
version bump.  However, Alexander Korotkov pointed out that that would
leave us in a pretty messy situation if we ever wanted to redefine those
functions later, because there wouldn't be a unique way to name them.
Since we're going to be bumping these extensions' versions anyway for
parallel-query cleanups, let's take care of this now.

Andreas Karlsson, adjusted for more search-path-safety by me

contrib/btree_gist/Makefile

@@ -9,8 +9,8 @@ OBJS =  btree_gist.o btree_utils_num.o btree_utils_var.o btree_int2.o \
         btree_numeric.o $(WIN32RES)
 
 EXTENSION = btree_gist
-DATA = btree_gist--1.1.sql btree_gist--unpackaged--1.0.sql \
-	btree_gist--1.0--1.1.sql
+DATA = btree_gist--1.2.sql btree_gist--1.1--1.2.sql btree_gist--1.0--1.1.sql \
+	btree_gist--unpackaged--1.0.sql
 PGFILEDESC = "btree_gist - B-tree equivalent GiST operator classes"
 
 REGRESS = init int2 int4 int8 float4 float8 cash oid timestamp timestamptz \

contrib/btree_gist/btree_gist--1.1--1.2.sql

@@ -0,0 +1,63 @@
+/* contrib/btree_gist/btree_gist--1.1--1.2.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION btree_gist UPDATE TO '1.2'" to load this file. \quit
+
+-- Update procedure signatures the hard way.
+-- We use to_regprocedure() so that query doesn't fail if run against 9.6beta1 definitions,
+-- wherein the signatures have been updated already.  In that case to_regprocedure() will
+-- return NULL and no updates will happen.
+
+UPDATE pg_catalog.pg_proc SET
+  proargtypes = pg_catalog.array_to_string(newtypes::pg_catalog.oid[], ' ')::pg_catalog.oidvector,
+  pronargs = pg_catalog.array_length(newtypes, 1)
+FROM (VALUES
+(NULL::pg_catalog.text, NULL::pg_catalog.regtype[]), -- establish column types
+('gbt_oid_distance(internal,oid,int2,oid)', '{internal,oid,int2,oid,internal}'),
+('gbt_oid_union(bytea,internal)', '{internal,internal}'),
+('gbt_oid_same(internal,internal,internal)', '{gbtreekey8,gbtreekey8,internal}'),
+('gbt_int2_distance(internal,int2,int2,oid)', '{internal,int2,int2,oid,internal}'),
+('gbt_int2_union(bytea,internal)', '{internal,internal}'),
+('gbt_int2_same(internal,internal,internal)', '{gbtreekey4,gbtreekey4,internal}'),
+('gbt_int4_distance(internal,int4,int2,oid)', '{internal,int4,int2,oid,internal}'),
+('gbt_int4_union(bytea,internal)', '{internal,internal}'),
+('gbt_int4_same(internal,internal,internal)', '{gbtreekey8,gbtreekey8,internal}'),
+('gbt_int8_distance(internal,int8,int2,oid)', '{internal,int8,int2,oid,internal}'),
+('gbt_int8_union(bytea,internal)', '{internal,internal}'),
+('gbt_int8_same(internal,internal,internal)', '{gbtreekey16,gbtreekey16,internal}'),
+('gbt_float4_distance(internal,float4,int2,oid)', '{internal,float4,int2,oid,internal}'),
+('gbt_float4_union(bytea,internal)', '{internal,internal}'),
+('gbt_float4_same(internal,internal,internal)', '{gbtreekey8,gbtreekey8,internal}'),
+('gbt_float8_distance(internal,float8,int2,oid)', '{internal,float8,int2,oid,internal}'),
+('gbt_float8_union(bytea,internal)', '{internal,internal}'),
+('gbt_float8_same(internal,internal,internal)', '{gbtreekey16,gbtreekey16,internal}'),
+('gbt_ts_distance(internal,timestamp,int2,oid)', '{internal,timestamp,int2,oid,internal}'),
+('gbt_tstz_distance(internal,timestamptz,int2,oid)', '{internal,timestamptz,int2,oid,internal}'),
+('gbt_ts_union(bytea,internal)', '{internal,internal}'),
+('gbt_ts_same(internal,internal,internal)', '{gbtreekey16,gbtreekey16,internal}'),
+('gbt_time_distance(internal,time,int2,oid)', '{internal,time,int2,oid,internal}'),
+('gbt_time_union(bytea,internal)', '{internal,internal}'),
+('gbt_time_same(internal,internal,internal)', '{gbtreekey16,gbtreekey16,internal}'),
+('gbt_date_distance(internal,date,int2,oid)', '{internal,date,int2,oid,internal}'),
+('gbt_date_union(bytea,internal)', '{internal,internal}'),
+('gbt_date_same(internal,internal,internal)', '{gbtreekey8,gbtreekey8,internal}'),
+('gbt_intv_distance(internal,interval,int2,oid)', '{internal,interval,int2,oid,internal}'),
+('gbt_intv_union(bytea,internal)', '{internal,internal}'),
+('gbt_intv_same(internal,internal,internal)', '{gbtreekey32,gbtreekey32,internal}'),
+('gbt_cash_distance(internal,money,int2,oid)', '{internal,money,int2,oid,internal}'),
+('gbt_cash_union(bytea,internal)', '{internal,internal}'),
+('gbt_cash_same(internal,internal,internal)', '{gbtreekey16,gbtreekey16,internal}'),
+('gbt_macad_union(bytea,internal)', '{internal,internal}'),
+('gbt_macad_same(internal,internal,internal)', '{gbtreekey16,gbtreekey16,internal}'),
+('gbt_text_union(bytea,internal)', '{internal,internal}'),
+('gbt_text_same(internal,internal,internal)', '{gbtreekey_var,gbtreekey_var,internal}'),
+('gbt_bytea_union(bytea,internal)', '{internal,internal}'),
+('gbt_bytea_same(internal,internal,internal)', '{gbtreekey_var,gbtreekey_var,internal}'),
+('gbt_numeric_union(bytea,internal)', '{internal,internal}'),
+('gbt_numeric_same(internal,internal,internal)', '{gbtreekey_var,gbtreekey_var,internal}'),
+('gbt_bit_union(bytea,internal)', '{internal,internal}'),
+('gbt_bit_same(internal,internal,internal)', '{gbtreekey_var,gbtreekey_var,internal}'),
+('gbt_inet_union(bytea,internal)', '{internal,internal}'),
+('gbt_inet_same(internal,internal,internal)', '{gbtreekey16,gbtreekey16,internal}')
+) AS update_data (oldproc, newtypes)
+WHERE oid = pg_catalog.to_regprocedure(oldproc);

contrib/btree_gist/btree_gist--1.2.sql

@@ -1,4 +1,4 @@
-/* contrib/btree_gist/btree_gist--1.0.sql */
+/* contrib/btree_gist/btree_gist--1.2.sql */
 
 -- complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION btree_gist" to load this file. \quit

contrib/btree_gist/btree_gist.control

@@ -1,5 +1,5 @@
 # btree_gist extension
 comment = 'support for indexing common datatypes in GiST'
-default_version = '1.1'
+default_version = '1.2'
 module_pathname = '$libdir/btree_gist'
 relocatable = true