Change many routines to return ObjectAddress rather than OID

The changed routines are mostly those that can be directly called by
ProcessUtilitySlow; the intention is to make the affected object
information more precise, in support for future event trigger changes.
Originally it was envisioned that the OID of the affected object would
be enough, and in most cases that is correct, but upon actually
implementing the event trigger changes it turned out that ObjectAddress
is more widely useful.

Additionally, some command execution routines grew an output argument
that's an object address which provides further info about the executed
command.  To wit:

* for ALTER DOMAIN / ADD CONSTRAINT, it corresponds to the address of
  the new constraint

* for ALTER OBJECT / SET SCHEMA, it corresponds to the address of the
  schema that originally contained the object.

* for ALTER EXTENSION {ADD, DROP} OBJECT, it corresponds to the address
  of the object added to or dropped from the extension.

There's no user-visible change in this commit, and no functional change
either.

Discussion: 20150218213255.GC6717@tamriel.snowman.net
Reviewed-By: Stephen Frost, Andres Freund

1 files changed, 11 insertions, 5 deletions

diff --git a/src/backend/rewrite/rewriteDefine.c b/src/backend/rewrite/rewriteDefine.c
index eab4d7367c2..f540432ccbc 100644
--- a/src/backend/rewrite/rewriteDefine.c
+++ b/src/backend/rewrite/rewriteDefine.c
@@ -191,7 +191,7 @@ InsertRule(char *rulname,
  * DefineRule
  *		Execute a CREATE RULE command.
  */
-Oid
+ObjectAddress
 DefineRule(RuleStmt *stmt, const char *queryString)
 {
 	List	   *actions;
@@ -225,7 +225,7 @@ DefineRule(RuleStmt *stmt, const char *queryString)
  * This is essentially the same as DefineRule() except that the rule's
  * action and qual have already been passed through parse analysis.
  */
-Oid
+ObjectAddress
 DefineQueryRewrite(char *rulename,
 				   Oid event_relid,
 				   Node *event_qual,
@@ -239,6 +239,7 @@ DefineQueryRewrite(char *rulename,
 	Query	   *query;
 	bool		RelisBecomingView = false;
 	Oid			ruleId = InvalidOid;
+	ObjectAddress address;
 
 	/*
 	 * If we are installing an ON SELECT rule, we had better grab
@@ -604,10 +605,12 @@ DefineQueryRewrite(char *rulename,
 		heap_close(relationRelation, RowExclusiveLock);
 	}
 
+	ObjectAddressSet(address, RewriteRelationId, ruleId);
+
 	/* Close rel, but keep lock till commit... */
 	heap_close(event_relation, NoLock);
 
-	return ruleId;
+	return address;
 }
 
 /*
@@ -897,7 +900,7 @@ RangeVarCallbackForRenameRule(const RangeVar *rv, Oid relid, Oid oldrelid,
 /*
  * Rename an existing rewrite rule.
  */
-Oid
+ObjectAddress
 RenameRewriteRule(RangeVar *relation, const char *oldName,
 				  const char *newName)
 {
@@ -907,6 +910,7 @@ RenameRewriteRule(RangeVar *relation, const char *oldName,
 	HeapTuple	ruletup;
 	Form_pg_rewrite ruleform;
 	Oid			ruleOid;
+	ObjectAddress address;
 
 	/*
 	 * Look up name, check permissions, and acquire lock (which we will NOT
@@ -969,10 +973,12 @@ RenameRewriteRule(RangeVar *relation, const char *oldName,
 	 */
 	CacheInvalidateRelcache(targetrel);
 
+	ObjectAddressSet(address, RewriteRelationId, ruleOid);
+
 	/*
 	 * Close rel, but keep exclusive lock!
 	 */
 	relation_close(targetrel, NoLock);
 
-	return ruleOid;
+	return address;
 }