Portal and memory management infrastructure for extended query protocol.

Both plannable queries and utility commands are now always executed
within Portals, which have been revamped so that they can handle the
load (they used to be good only for single SELECT queries).  Restructure
code to push command-completion-tag selection logic out of postgres.c,
so that it won't have to be duplicated between simple and extended queries.
initdb forced due to addition of a field to Query nodes.

src/include/tcop/pquery.h

@@ -7,17 +7,32 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: pquery.h,v 1.24 2003/03/10 03:53:52 tgl Exp $
+ * $Id: pquery.h,v 1.25 2003/05/02 20:54:36 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
 #ifndef PQUERY_H
 #define PQUERY_H
 
-#include "executor/execdesc.h"
+#include "utils/portal.h"
 
 
-extern void ProcessQuery(Query *parsetree, Plan *plan, CommandDest dest,
-			 char *completionTag);
+extern void ProcessQuery(Query *parsetree,
+						 Plan *plan,
+						 ParamListInfo params,
+						 const char *portalName,
+						 CommandDest dest,
+						 char *completionTag);
+
+extern void PortalStart(Portal portal, ParamListInfo params);
+
+extern bool PortalRun(Portal portal, long count,
+					  CommandDest dest, CommandDest altdest,
+					  char *completionTag);
+
+extern long PortalRunFetch(Portal portal,
+						   FetchDirection fdirection,
+						   long count,
+						   CommandDest dest);
 
 #endif   /* PQUERY_H */