This patch implements the following command:

ALTER TABLE <tablename> OWNER TO <username>

Only a superuser may execute the command.

--
Mark Hollomon
mhh@mindspring.com

src/backend/commands/command.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.101 2000/09/12 04:49:06 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/Attic/command.c,v 1.102 2000/09/12 05:09:43 momjian Exp $
  *
  * NOTES
  *	  The PerformAddAttribute() code, like most of the relation
@@ -47,6 +47,7 @@
 #include "utils/temprel.h"
 #include "executor/spi_priv.h"
 #include "catalog/pg_index.h"
+#include "catalog/pg_shadow.h"
 #include "utils/relcache.h"
 
 #ifdef	_DROP_COLUMN_HACK__
@@ -1449,6 +1450,70 @@ AlterTableDropConstraint(const char *relationName,
 
 
 
+/*
+ * ALTER TABLE OWNER
+ */
+void
+AlterTableOwner(const char *relationName, const char *newOwnerName)
+{
+	Relation 	class_rel;
+	HeapTuple 	tuple;
+	int4 		newOwnerSysid;
+	Relation	idescs[Num_pg_class_indices];
+
+	/*
+	 * first check that we are a superuser
+	 */
+	if (! superuser() )
+		elog(ERROR, "ALTER TABLE: permission denied");
+
+	/*
+	 * look up the new owner in pg_shadow and get the sysid
+	 */
+	tuple = SearchSysCacheTuple(SHADOWNAME, PointerGetDatum(newOwnerName),
+							   0, 0, 0);
+	if (!HeapTupleIsValid(tuple))
+		elog(ERROR, "ALTER TABLE: user \"%s\" not found", newOwnerName);
+
+	newOwnerSysid = ((Form_pg_shadow) GETSTRUCT(tuple))->usesysid;
+	heap_freetuple(tuple);
+
+	/*
+	 * find the table's entry in pg_class and lock it for writing
+	 */
+	class_rel = heap_openr(RelationRelationName, RowExclusiveLock);
+
+	tuple = SearchSysCacheTuple(RELNAME, PointerGetDatum(relationName),
+								 0, 0, 0);
+	if (!HeapTupleIsValid(tuple))
+		elog(ERROR, "ALTER TABLE: relation \"%s\" not found",
+			 relationName);
+
+	if (((Form_pg_class) GETSTRUCT(tuple))->relkind != RELKIND_RELATION)
+		elog(ERROR, "ALTER TABLE: relation \"%s\" is not a table",
+				relationName);
+
+	/*
+	 * modify the table's entry and write to the heap
+	 */
+	((Form_pg_class) GETSTRUCT(tuple))->relowner = newOwnerSysid;
+
+	heap_update(class_rel, &tuple->t_self, tuple, NULL);
+
+	/* Keep the catalog indices up to date */
+	CatalogOpenIndices(Num_pg_class_indices, Name_pg_class_indices, idescs);
+	CatalogIndexInsert(idescs, Num_pg_class_indices, class_rel, tuple);
+	CatalogCloseIndices(Num_pg_class_indices, idescs);
+
+	/*
+	 * unlock everything and return
+	 */
+	heap_freetuple(tuple);
+	heap_close(class_rel, RowExclusiveLock);
+
+	return;
+}
+
 /*
  * ALTER TABLE CREATE TOAST TABLE
  */

src/backend/parser/gram.y

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.187 2000/08/26 21:53:43 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.188 2000/09/12 05:09:44 momjian Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -350,7 +350,7 @@ static void doNegateFloat(Value *v);
 		LANCOMPILER, LIMIT, LISTEN, LOAD, LOCATION, LOCK_P,
 		MAXVALUE, MINVALUE, MODE, MOVE,
 		NEW, NOCREATEDB, NOCREATEUSER, NONE, NOTHING, NOTIFY, NOTNULL,
-		OFFSET, OIDS, OPERATOR, PASSWORD, PROCEDURAL,
+		OFFSET, OIDS, OPERATOR, OWNER, PASSWORD, PROCEDURAL,
 		REINDEX, RENAME, RESET, RETURNS, ROW, RULE,
 		SEQUENCE, SERIAL, SETOF, SHARE, SHOW, START, STATEMENT, STDIN, STDOUT, SYSID,
 		TEMP, TOAST, TRUNCATE, TRUSTED, 
@@ -1031,6 +1031,16 @@ AlterTableStmt:
 					n->relname = $3;
 					$$ = (Node *)n;
 				}
+
+/* ALTER TABLE <name> OWNER TO UserId */
+		| ALTER TABLE relation_name OWNER TO UserId
+				{
+					AlterTableStmt *n = makeNode(AlterTableStmt);
+					n->subtype = 'U';
+					n->relname = $3;
+					n->name = $6;
+					$$ = (Node *)n;
+				}
 		;
 
 alter_column_action:
@@ -5641,6 +5651,7 @@ TokenId:  ABSOLUTE						{ $$ = "absolute"; }
 		| OIDS							{ $$ = "oids"; }
 		| OPERATOR						{ $$ = "operator"; }
 		| OPTION						{ $$ = "option"; }
+		| OWNER							{ $$ = "owner"; }
 		| PARTIAL						{ $$ = "partial"; }
 		| PASSWORD						{ $$ = "password"; }
 		| PENDANT						{ $$ = "pendant"; }

src/backend/parser/keywords.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.80 2000/08/06 18:05:22 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.81 2000/09/12 05:09:44 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -196,6 +196,7 @@ static ScanKeyword ScanKeywords[] = {
 	{"out", OUT},
 	{"outer", OUTER_P},
 	{"overlaps", OVERLAPS},
+	{"owner", OWNER},
 	{"partial", PARTIAL},
 	{"password", PASSWORD},
 	{"path", PATH_P},

src/backend/tcop/utility.c

@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.93 2000/09/12 04:49:11 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.94 2000/09/12 05:09:45 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -371,6 +371,9 @@ ProcessUtility(Node *parsetree,
 					case 'E':	/* CREATE TOAST TABLE */
 						AlterTableCreateToastTable(stmt->relname, false);
 						break;
+					case 'U':	/* ALTER OWNER */
+						AlterTableOwner(stmt->relname, stmt->name);
+						break;
 					default:	/* oops */
 						elog(ERROR, "T_AlterTableStmt: unknown subtype");
 						break;