Remove PortalGetQueryDesc()

After having gotten rid of PortalGetHeapMemory(), there seems little
reason to keep one Portal access macro around that offers no actual
abstraction and isn't consistently used anyway.
Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>

src/backend/commands/portalcmds.c

@@ -277,7 +277,7 @@ PortalCleanup(Portal portal)
 	 * since other mechanisms will take care of releasing executor resources,
 	 * and we can't be sure that ExecutorEnd itself wouldn't fail.
 	 */
-	queryDesc = PortalGetQueryDesc(portal);
+	queryDesc = portal->queryDesc;
 	if (queryDesc)
 	{
 		/*
@@ -317,7 +317,7 @@ PortalCleanup(Portal portal)
 void
 PersistHoldablePortal(Portal portal)
 {
-	QueryDesc  *queryDesc = PortalGetQueryDesc(portal);
+	QueryDesc  *queryDesc = portal->queryDesc;
 	Portal		saveActivePortal;
 	ResourceOwner saveResourceOwner;
 	MemoryContext savePortalContext;

src/backend/executor/execCurrent.c

@@ -75,7 +75,7 @@ execCurrentOf(CurrentOfExpr *cexpr,
 				(errcode(ERRCODE_INVALID_CURSOR_STATE),
 				 errmsg("cursor \"%s\" is not a SELECT query",
 						cursor_name)));
-	queryDesc = PortalGetQueryDesc(portal);
+	queryDesc = portal->queryDesc;
 	if (queryDesc == NULL || queryDesc->estate == NULL)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_CURSOR_STATE),

src/backend/tcop/pquery.c

@@ -885,7 +885,7 @@ PortalRunSelect(Portal portal,
 	 * NB: queryDesc will be NULL if we are fetching from a held cursor or a
 	 * completed utility query; can't use it in that path.
 	 */
-	queryDesc = PortalGetQueryDesc(portal);
+	queryDesc = portal->queryDesc;
 
 	/* Caller messed up if we have neither a ready query nor held data. */
 	Assert(queryDesc || portal->holdStore);
@@ -1694,7 +1694,7 @@ DoPortalRewind(Portal portal)
 	}
 
 	/* Rewind executor, if active */
-	queryDesc = PortalGetQueryDesc(portal);
+	queryDesc = portal->queryDesc;
 	if (queryDesc)
 	{
 		PushActiveSnapshot(queryDesc->snapshot);

src/include/utils/portal.h

@@ -198,11 +198,6 @@ typedef struct PortalData
  */
 #define PortalIsValid(p) PointerIsValid(p)
 
-/*
- * Access macros for Portal ... use these in preference to field access.
- */
-#define PortalGetQueryDesc(portal)	((portal)->queryDesc)
-
 
 /* Prototypes for functions in utils/mmgr/portalmem.c */
 extern void EnablePortalManager(void);