Fix argument of pg_create_logical_replication_slot for slot name

All attributes and arguments using a slot name map to the data type
"name", but this function has been using "text".  This is cosmetic, as
even if text is used then the slot name would be truncated to 64
characters anyway and stored as such.  The documentation already said
so and the function already assumed that the argument was of this type
when fetching its value.

Bump catalog version.

Author: Sawada Masahiko
Discussion: https://postgr.es/m/CAD21AoADYz_-eAqH5AVFaCaojcRgwpo9PW=u8kgTMys63oB8Cw@mail.gmail.com

src/backend/catalog/system_views.sql

@@ -1081,7 +1081,7 @@ AS 'pg_create_physical_replication_slot';
 CREATE OR REPLACE FUNCTION pg_create_logical_replication_slot(
     IN slot_name name, IN plugin name,
     IN temporary boolean DEFAULT false,
-    OUT slot_name text, OUT lsn pg_lsn)
+    OUT slot_name name, OUT lsn pg_lsn)
 RETURNS RECORD
 LANGUAGE INTERNAL
 STRICT VOLATILE

src/backend/replication/slotfuncs.c

@@ -142,7 +142,7 @@ pg_create_logical_replication_slot(PG_FUNCTION_ARGS)
 	/* build initial snapshot, might take a while */
 	DecodingContextFindStartpoint(ctx);
 
-	values[0] = CStringGetTextDatum(NameStr(MyReplicationSlot->data.name));
+	values[0] = NameGetDatum(&MyReplicationSlot->data.name);
 	values[1] = LSNGetDatum(MyReplicationSlot->data.confirmed_flush);
 
 	/* don't need the decoding context anymore */

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201807111
+#define CATALOG_VERSION_NO	201807121
 
 #endif

src/include/catalog/pg_proc.dat

@@ -9803,7 +9803,7 @@
 { oid => '3786', descr => 'set up a logical replication slot',
   proname => 'pg_create_logical_replication_slot', provolatile => 'v',
   proparallel => 'u', prorettype => 'record', proargtypes => 'name name bool',
-  proallargtypes => '{name,name,bool,text,pg_lsn}',
+  proallargtypes => '{name,name,bool,name,pg_lsn}',
   proargmodes => '{i,i,i,o,o}',
   proargnames => '{slot_name,plugin,temporary,slot_name,lsn}',
   prosrc => 'pg_create_logical_replication_slot' },